Direct numerical simulations of temporally decelerating turbulent pipe flows
Abstract Direct numerical simulations of temporally decelerating turbulent pipe flows are performed to examine the effects of temporal deceleration on the turbulence characteristics. The temporal decelerations are applied with three different values of the decelerating parameter f = |dUb/dt| based o...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Lee, Young Mo [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2018 |
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| Schlagwörter: |
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| Anmerkung: |
© The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2018 |
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| Übergeordnetes Werk: |
Enthalten in: Journal of mechanical science and technology - Berlin : Springer, 2005, 32(2018), 8 vom: Aug., Seite 3713-3726 |
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| Übergeordnetes Werk: |
volume:32 ; year:2018 ; number:8 ; month:08 ; pages:3713-3726 |
| Links: |
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| DOI / URN: |
10.1007/s12206-018-0724-5 |
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| Katalog-ID: |
SPR025339524 |
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| 100 | 1 | |a Lee, Young Mo |e verfasserin |4 aut | |
| 245 | 1 | 0 | |a Direct numerical simulations of temporally decelerating turbulent pipe flows |
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| 520 | |a Abstract Direct numerical simulations of temporally decelerating turbulent pipe flows are performed to examine the effects of temporal deceleration on the turbulence characteristics. The temporal decelerations are applied with three different values of the decelerating parameter f = |dUb/dt| based on the bulk mean velocity (Ub) to introduce weak, mild and strong decelerations, and the flow rates for all cases are linearly decreased with time. In order to highlight the variation of the turbulent statistics for an unsteady flow, five independent simulations of steady flows are conducted along with the Reynolds number. An inspection of the mean velocity profiles shows that the log law in the overlap region is established with a slight downward shift for the weakly decelerating flow, whereas this is not the case for the strong decelerating flow. A comparison of the Reynolds stress profiles between the unsteady and steady flows displays that the turbulence is highly intensified with an increase of f due to the enhanced vortical structures and that the radial propagation of the turbulence is delayed. An analysis of the turbulent production term of the Reynolds stress budget equation shows that frozen of the strong second-quadrant Reynolds shear stress event plays an important role in delaying the response of the turbulent energy with a decrease of the Reynolds number, leading to an increase in the Reynolds stress. In addition, spectral decomposition of the streamwise Reynolds normal stress into small- and large-scale components reveals that the enhanced turbulence throughout the entire flow for unsteady flows is a direct consequence of the delay of strong large-scale structures, although small-scale structures throughout the wall layer adjust rapidly to temporal deceleration. | ||
| 650 | 4 | |a Direct numerical simulation |7 (dpeaa)DE-He213 | |
| 650 | 4 | |a Turbulent pipe flow |7 (dpeaa)DE-He213 | |
| 650 | 4 | |a Temporal deceleration |7 (dpeaa)DE-He213 | |
| 700 | 1 | |a Jung, Wongwan |4 aut | |
| 700 | 1 | |a Lee, Jae Hwa |4 aut | |
| 700 | 1 | |a Kim, Jooha |4 aut | |
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10.1007/s12206-018-0724-5 doi (DE-627)SPR025339524 (SPR)s12206-018-0724-5-e DE-627 ger DE-627 rakwb eng Lee, Young Mo verfasserin aut Direct numerical simulations of temporally decelerating turbulent pipe flows 2018 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2018 Abstract Direct numerical simulations of temporally decelerating turbulent pipe flows are performed to examine the effects of temporal deceleration on the turbulence characteristics. The temporal decelerations are applied with three different values of the decelerating parameter f = |dUb/dt| based on the bulk mean velocity (Ub) to introduce weak, mild and strong decelerations, and the flow rates for all cases are linearly decreased with time. In order to highlight the variation of the turbulent statistics for an unsteady flow, five independent simulations of steady flows are conducted along with the Reynolds number. An inspection of the mean velocity profiles shows that the log law in the overlap region is established with a slight downward shift for the weakly decelerating flow, whereas this is not the case for the strong decelerating flow. A comparison of the Reynolds stress profiles between the unsteady and steady flows displays that the turbulence is highly intensified with an increase of f due to the enhanced vortical structures and that the radial propagation of the turbulence is delayed. An analysis of the turbulent production term of the Reynolds stress budget equation shows that frozen of the strong second-quadrant Reynolds shear stress event plays an important role in delaying the response of the turbulent energy with a decrease of the Reynolds number, leading to an increase in the Reynolds stress. In addition, spectral decomposition of the streamwise Reynolds normal stress into small- and large-scale components reveals that the enhanced turbulence throughout the entire flow for unsteady flows is a direct consequence of the delay of strong large-scale structures, although small-scale structures throughout the wall layer adjust rapidly to temporal deceleration. Direct numerical simulation (dpeaa)DE-He213 Turbulent pipe flow (dpeaa)DE-He213 Temporal deceleration (dpeaa)DE-He213 Jung, Wongwan aut Lee, Jae Hwa aut Kim, Jooha aut Enthalten in Journal of mechanical science and technology Berlin : Springer, 2005 32(2018), 8 vom: Aug., Seite 3713-3726 (DE-627)58714016X (DE-600)2467571-4 1976-3824 nnns volume:32 year:2018 number:8 month:08 pages:3713-3726 https://dx.doi.org/10.1007/s12206-018-0724-5 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_138 GBV_ILN_150 GBV_ILN_151 GBV_ILN_152 GBV_ILN_161 GBV_ILN_170 GBV_ILN_171 GBV_ILN_187 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_636 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2057 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2070 GBV_ILN_2086 GBV_ILN_2088 GBV_ILN_2093 GBV_ILN_2106 GBV_ILN_2107 GBV_ILN_2108 GBV_ILN_2110 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2116 GBV_ILN_2118 GBV_ILN_2119 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2188 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2446 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_2548 GBV_ILN_4012 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4246 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4336 GBV_ILN_4338 GBV_ILN_4393 GBV_ILN_4700 AR 32 2018 8 08 3713-3726 |
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10.1007/s12206-018-0724-5 doi (DE-627)SPR025339524 (SPR)s12206-018-0724-5-e DE-627 ger DE-627 rakwb eng Lee, Young Mo verfasserin aut Direct numerical simulations of temporally decelerating turbulent pipe flows 2018 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2018 Abstract Direct numerical simulations of temporally decelerating turbulent pipe flows are performed to examine the effects of temporal deceleration on the turbulence characteristics. The temporal decelerations are applied with three different values of the decelerating parameter f = |dUb/dt| based on the bulk mean velocity (Ub) to introduce weak, mild and strong decelerations, and the flow rates for all cases are linearly decreased with time. In order to highlight the variation of the turbulent statistics for an unsteady flow, five independent simulations of steady flows are conducted along with the Reynolds number. An inspection of the mean velocity profiles shows that the log law in the overlap region is established with a slight downward shift for the weakly decelerating flow, whereas this is not the case for the strong decelerating flow. A comparison of the Reynolds stress profiles between the unsteady and steady flows displays that the turbulence is highly intensified with an increase of f due to the enhanced vortical structures and that the radial propagation of the turbulence is delayed. An analysis of the turbulent production term of the Reynolds stress budget equation shows that frozen of the strong second-quadrant Reynolds shear stress event plays an important role in delaying the response of the turbulent energy with a decrease of the Reynolds number, leading to an increase in the Reynolds stress. In addition, spectral decomposition of the streamwise Reynolds normal stress into small- and large-scale components reveals that the enhanced turbulence throughout the entire flow for unsteady flows is a direct consequence of the delay of strong large-scale structures, although small-scale structures throughout the wall layer adjust rapidly to temporal deceleration. Direct numerical simulation (dpeaa)DE-He213 Turbulent pipe flow (dpeaa)DE-He213 Temporal deceleration (dpeaa)DE-He213 Jung, Wongwan aut Lee, Jae Hwa aut Kim, Jooha aut Enthalten in Journal of mechanical science and technology Berlin : Springer, 2005 32(2018), 8 vom: Aug., Seite 3713-3726 (DE-627)58714016X (DE-600)2467571-4 1976-3824 nnns volume:32 year:2018 number:8 month:08 pages:3713-3726 https://dx.doi.org/10.1007/s12206-018-0724-5 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_138 GBV_ILN_150 GBV_ILN_151 GBV_ILN_152 GBV_ILN_161 GBV_ILN_170 GBV_ILN_171 GBV_ILN_187 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_636 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2057 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2070 GBV_ILN_2086 GBV_ILN_2088 GBV_ILN_2093 GBV_ILN_2106 GBV_ILN_2107 GBV_ILN_2108 GBV_ILN_2110 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2116 GBV_ILN_2118 GBV_ILN_2119 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2188 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2446 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_2548 GBV_ILN_4012 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4246 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4336 GBV_ILN_4338 GBV_ILN_4393 GBV_ILN_4700 AR 32 2018 8 08 3713-3726 |
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10.1007/s12206-018-0724-5 doi (DE-627)SPR025339524 (SPR)s12206-018-0724-5-e DE-627 ger DE-627 rakwb eng Lee, Young Mo verfasserin aut Direct numerical simulations of temporally decelerating turbulent pipe flows 2018 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2018 Abstract Direct numerical simulations of temporally decelerating turbulent pipe flows are performed to examine the effects of temporal deceleration on the turbulence characteristics. The temporal decelerations are applied with three different values of the decelerating parameter f = |dUb/dt| based on the bulk mean velocity (Ub) to introduce weak, mild and strong decelerations, and the flow rates for all cases are linearly decreased with time. In order to highlight the variation of the turbulent statistics for an unsteady flow, five independent simulations of steady flows are conducted along with the Reynolds number. An inspection of the mean velocity profiles shows that the log law in the overlap region is established with a slight downward shift for the weakly decelerating flow, whereas this is not the case for the strong decelerating flow. A comparison of the Reynolds stress profiles between the unsteady and steady flows displays that the turbulence is highly intensified with an increase of f due to the enhanced vortical structures and that the radial propagation of the turbulence is delayed. An analysis of the turbulent production term of the Reynolds stress budget equation shows that frozen of the strong second-quadrant Reynolds shear stress event plays an important role in delaying the response of the turbulent energy with a decrease of the Reynolds number, leading to an increase in the Reynolds stress. In addition, spectral decomposition of the streamwise Reynolds normal stress into small- and large-scale components reveals that the enhanced turbulence throughout the entire flow for unsteady flows is a direct consequence of the delay of strong large-scale structures, although small-scale structures throughout the wall layer adjust rapidly to temporal deceleration. Direct numerical simulation (dpeaa)DE-He213 Turbulent pipe flow (dpeaa)DE-He213 Temporal deceleration (dpeaa)DE-He213 Jung, Wongwan aut Lee, Jae Hwa aut Kim, Jooha aut Enthalten in Journal of mechanical science and technology Berlin : Springer, 2005 32(2018), 8 vom: Aug., Seite 3713-3726 (DE-627)58714016X (DE-600)2467571-4 1976-3824 nnns volume:32 year:2018 number:8 month:08 pages:3713-3726 https://dx.doi.org/10.1007/s12206-018-0724-5 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_138 GBV_ILN_150 GBV_ILN_151 GBV_ILN_152 GBV_ILN_161 GBV_ILN_170 GBV_ILN_171 GBV_ILN_187 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_636 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2057 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2070 GBV_ILN_2086 GBV_ILN_2088 GBV_ILN_2093 GBV_ILN_2106 GBV_ILN_2107 GBV_ILN_2108 GBV_ILN_2110 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2116 GBV_ILN_2118 GBV_ILN_2119 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2188 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2446 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_2548 GBV_ILN_4012 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4246 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4336 GBV_ILN_4338 GBV_ILN_4393 GBV_ILN_4700 AR 32 2018 8 08 3713-3726 |
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10.1007/s12206-018-0724-5 doi (DE-627)SPR025339524 (SPR)s12206-018-0724-5-e DE-627 ger DE-627 rakwb eng Lee, Young Mo verfasserin aut Direct numerical simulations of temporally decelerating turbulent pipe flows 2018 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2018 Abstract Direct numerical simulations of temporally decelerating turbulent pipe flows are performed to examine the effects of temporal deceleration on the turbulence characteristics. The temporal decelerations are applied with three different values of the decelerating parameter f = |dUb/dt| based on the bulk mean velocity (Ub) to introduce weak, mild and strong decelerations, and the flow rates for all cases are linearly decreased with time. In order to highlight the variation of the turbulent statistics for an unsteady flow, five independent simulations of steady flows are conducted along with the Reynolds number. An inspection of the mean velocity profiles shows that the log law in the overlap region is established with a slight downward shift for the weakly decelerating flow, whereas this is not the case for the strong decelerating flow. A comparison of the Reynolds stress profiles between the unsteady and steady flows displays that the turbulence is highly intensified with an increase of f due to the enhanced vortical structures and that the radial propagation of the turbulence is delayed. An analysis of the turbulent production term of the Reynolds stress budget equation shows that frozen of the strong second-quadrant Reynolds shear stress event plays an important role in delaying the response of the turbulent energy with a decrease of the Reynolds number, leading to an increase in the Reynolds stress. In addition, spectral decomposition of the streamwise Reynolds normal stress into small- and large-scale components reveals that the enhanced turbulence throughout the entire flow for unsteady flows is a direct consequence of the delay of strong large-scale structures, although small-scale structures throughout the wall layer adjust rapidly to temporal deceleration. Direct numerical simulation (dpeaa)DE-He213 Turbulent pipe flow (dpeaa)DE-He213 Temporal deceleration (dpeaa)DE-He213 Jung, Wongwan aut Lee, Jae Hwa aut Kim, Jooha aut Enthalten in Journal of mechanical science and technology Berlin : Springer, 2005 32(2018), 8 vom: Aug., Seite 3713-3726 (DE-627)58714016X (DE-600)2467571-4 1976-3824 nnns volume:32 year:2018 number:8 month:08 pages:3713-3726 https://dx.doi.org/10.1007/s12206-018-0724-5 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_138 GBV_ILN_150 GBV_ILN_151 GBV_ILN_152 GBV_ILN_161 GBV_ILN_170 GBV_ILN_171 GBV_ILN_187 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_636 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2057 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2070 GBV_ILN_2086 GBV_ILN_2088 GBV_ILN_2093 GBV_ILN_2106 GBV_ILN_2107 GBV_ILN_2108 GBV_ILN_2110 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2116 GBV_ILN_2118 GBV_ILN_2119 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2188 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2446 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_2548 GBV_ILN_4012 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4246 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4336 GBV_ILN_4338 GBV_ILN_4393 GBV_ILN_4700 AR 32 2018 8 08 3713-3726 |
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10.1007/s12206-018-0724-5 doi (DE-627)SPR025339524 (SPR)s12206-018-0724-5-e DE-627 ger DE-627 rakwb eng Lee, Young Mo verfasserin aut Direct numerical simulations of temporally decelerating turbulent pipe flows 2018 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2018 Abstract Direct numerical simulations of temporally decelerating turbulent pipe flows are performed to examine the effects of temporal deceleration on the turbulence characteristics. The temporal decelerations are applied with three different values of the decelerating parameter f = |dUb/dt| based on the bulk mean velocity (Ub) to introduce weak, mild and strong decelerations, and the flow rates for all cases are linearly decreased with time. In order to highlight the variation of the turbulent statistics for an unsteady flow, five independent simulations of steady flows are conducted along with the Reynolds number. An inspection of the mean velocity profiles shows that the log law in the overlap region is established with a slight downward shift for the weakly decelerating flow, whereas this is not the case for the strong decelerating flow. A comparison of the Reynolds stress profiles between the unsteady and steady flows displays that the turbulence is highly intensified with an increase of f due to the enhanced vortical structures and that the radial propagation of the turbulence is delayed. An analysis of the turbulent production term of the Reynolds stress budget equation shows that frozen of the strong second-quadrant Reynolds shear stress event plays an important role in delaying the response of the turbulent energy with a decrease of the Reynolds number, leading to an increase in the Reynolds stress. In addition, spectral decomposition of the streamwise Reynolds normal stress into small- and large-scale components reveals that the enhanced turbulence throughout the entire flow for unsteady flows is a direct consequence of the delay of strong large-scale structures, although small-scale structures throughout the wall layer adjust rapidly to temporal deceleration. Direct numerical simulation (dpeaa)DE-He213 Turbulent pipe flow (dpeaa)DE-He213 Temporal deceleration (dpeaa)DE-He213 Jung, Wongwan aut Lee, Jae Hwa aut Kim, Jooha aut Enthalten in Journal of mechanical science and technology Berlin : Springer, 2005 32(2018), 8 vom: Aug., Seite 3713-3726 (DE-627)58714016X (DE-600)2467571-4 1976-3824 nnns volume:32 year:2018 number:8 month:08 pages:3713-3726 https://dx.doi.org/10.1007/s12206-018-0724-5 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_138 GBV_ILN_150 GBV_ILN_151 GBV_ILN_152 GBV_ILN_161 GBV_ILN_170 GBV_ILN_171 GBV_ILN_187 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_636 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2057 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2070 GBV_ILN_2086 GBV_ILN_2088 GBV_ILN_2093 GBV_ILN_2106 GBV_ILN_2107 GBV_ILN_2108 GBV_ILN_2110 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2116 GBV_ILN_2118 GBV_ILN_2119 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2188 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2446 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_2548 GBV_ILN_4012 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4246 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4336 GBV_ILN_4338 GBV_ILN_4393 GBV_ILN_4700 AR 32 2018 8 08 3713-3726 |
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Lee, Young Mo @@aut@@ Jung, Wongwan @@aut@@ Lee, Jae Hwa @@aut@@ Kim, Jooha @@aut@@ |
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The temporal decelerations are applied with three different values of the decelerating parameter f = |dUb/dt| based on the bulk mean velocity (Ub) to introduce weak, mild and strong decelerations, and the flow rates for all cases are linearly decreased with time. In order to highlight the variation of the turbulent statistics for an unsteady flow, five independent simulations of steady flows are conducted along with the Reynolds number. An inspection of the mean velocity profiles shows that the log law in the overlap region is established with a slight downward shift for the weakly decelerating flow, whereas this is not the case for the strong decelerating flow. A comparison of the Reynolds stress profiles between the unsteady and steady flows displays that the turbulence is highly intensified with an increase of f due to the enhanced vortical structures and that the radial propagation of the turbulence is delayed. An analysis of the turbulent production term of the Reynolds stress budget equation shows that frozen of the strong second-quadrant Reynolds shear stress event plays an important role in delaying the response of the turbulent energy with a decrease of the Reynolds number, leading to an increase in the Reynolds stress. In addition, spectral decomposition of the streamwise Reynolds normal stress into small- and large-scale components reveals that the enhanced turbulence throughout the entire flow for unsteady flows is a direct consequence of the delay of strong large-scale structures, although small-scale structures throughout the wall layer adjust rapidly to temporal deceleration.</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Direct numerical simulation</subfield><subfield code="7">(dpeaa)DE-He213</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Turbulent pipe flow</subfield><subfield code="7">(dpeaa)DE-He213</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Temporal deceleration</subfield><subfield code="7">(dpeaa)DE-He213</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Jung, Wongwan</subfield><subfield code="4">aut</subfield></datafield><datafield tag="700" ind1="1" ind2=" 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direct numerical simulations of temporally decelerating turbulent pipe flows |
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Direct numerical simulations of temporally decelerating turbulent pipe flows |
| abstract |
Abstract Direct numerical simulations of temporally decelerating turbulent pipe flows are performed to examine the effects of temporal deceleration on the turbulence characteristics. The temporal decelerations are applied with three different values of the decelerating parameter f = |dUb/dt| based on the bulk mean velocity (Ub) to introduce weak, mild and strong decelerations, and the flow rates for all cases are linearly decreased with time. In order to highlight the variation of the turbulent statistics for an unsteady flow, five independent simulations of steady flows are conducted along with the Reynolds number. An inspection of the mean velocity profiles shows that the log law in the overlap region is established with a slight downward shift for the weakly decelerating flow, whereas this is not the case for the strong decelerating flow. A comparison of the Reynolds stress profiles between the unsteady and steady flows displays that the turbulence is highly intensified with an increase of f due to the enhanced vortical structures and that the radial propagation of the turbulence is delayed. An analysis of the turbulent production term of the Reynolds stress budget equation shows that frozen of the strong second-quadrant Reynolds shear stress event plays an important role in delaying the response of the turbulent energy with a decrease of the Reynolds number, leading to an increase in the Reynolds stress. In addition, spectral decomposition of the streamwise Reynolds normal stress into small- and large-scale components reveals that the enhanced turbulence throughout the entire flow for unsteady flows is a direct consequence of the delay of strong large-scale structures, although small-scale structures throughout the wall layer adjust rapidly to temporal deceleration. © The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2018 |
| abstractGer |
Abstract Direct numerical simulations of temporally decelerating turbulent pipe flows are performed to examine the effects of temporal deceleration on the turbulence characteristics. The temporal decelerations are applied with three different values of the decelerating parameter f = |dUb/dt| based on the bulk mean velocity (Ub) to introduce weak, mild and strong decelerations, and the flow rates for all cases are linearly decreased with time. In order to highlight the variation of the turbulent statistics for an unsteady flow, five independent simulations of steady flows are conducted along with the Reynolds number. An inspection of the mean velocity profiles shows that the log law in the overlap region is established with a slight downward shift for the weakly decelerating flow, whereas this is not the case for the strong decelerating flow. A comparison of the Reynolds stress profiles between the unsteady and steady flows displays that the turbulence is highly intensified with an increase of f due to the enhanced vortical structures and that the radial propagation of the turbulence is delayed. An analysis of the turbulent production term of the Reynolds stress budget equation shows that frozen of the strong second-quadrant Reynolds shear stress event plays an important role in delaying the response of the turbulent energy with a decrease of the Reynolds number, leading to an increase in the Reynolds stress. In addition, spectral decomposition of the streamwise Reynolds normal stress into small- and large-scale components reveals that the enhanced turbulence throughout the entire flow for unsteady flows is a direct consequence of the delay of strong large-scale structures, although small-scale structures throughout the wall layer adjust rapidly to temporal deceleration. © The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2018 |
| abstract_unstemmed |
Abstract Direct numerical simulations of temporally decelerating turbulent pipe flows are performed to examine the effects of temporal deceleration on the turbulence characteristics. The temporal decelerations are applied with three different values of the decelerating parameter f = |dUb/dt| based on the bulk mean velocity (Ub) to introduce weak, mild and strong decelerations, and the flow rates for all cases are linearly decreased with time. In order to highlight the variation of the turbulent statistics for an unsteady flow, five independent simulations of steady flows are conducted along with the Reynolds number. An inspection of the mean velocity profiles shows that the log law in the overlap region is established with a slight downward shift for the weakly decelerating flow, whereas this is not the case for the strong decelerating flow. A comparison of the Reynolds stress profiles between the unsteady and steady flows displays that the turbulence is highly intensified with an increase of f due to the enhanced vortical structures and that the radial propagation of the turbulence is delayed. An analysis of the turbulent production term of the Reynolds stress budget equation shows that frozen of the strong second-quadrant Reynolds shear stress event plays an important role in delaying the response of the turbulent energy with a decrease of the Reynolds number, leading to an increase in the Reynolds stress. In addition, spectral decomposition of the streamwise Reynolds normal stress into small- and large-scale components reveals that the enhanced turbulence throughout the entire flow for unsteady flows is a direct consequence of the delay of strong large-scale structures, although small-scale structures throughout the wall layer adjust rapidly to temporal deceleration. © The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2018 |
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Direct numerical simulations of temporally decelerating turbulent pipe flows |
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https://dx.doi.org/10.1007/s12206-018-0724-5 |
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Jung, Wongwan Lee, Jae Hwa Kim, Jooha |
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Jung, Wongwan Lee, Jae Hwa Kim, Jooha |
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| doi_str |
10.1007/s12206-018-0724-5 |
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2024-07-03T15:23:18.559Z |
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| score |
7.402316 |