Visualization and assessment of turbulent coherent structures in laminarescent boundary layers
Abstract Direct numerical simulation (DNS) with high spatial/temporal resolution of spatially developing turbulent boundary layers subject to very strong favorable pressure gradient (FPG) has been performed. The sudden acceleration imposed on the flow provokes a significant attenuation of turbulent...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Araya, G. [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2017 |
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| Schlagwörter: |
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| Anmerkung: |
© The Visualization Society of Japan 2017 |
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| Übergeordnetes Werk: |
Enthalten in: Journal of visualization - Berlin : Springer, 1998, 21(2017), 2 vom: 01. Dez., Seite 191-202 |
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| Übergeordnetes Werk: |
volume:21 ; year:2017 ; number:2 ; day:01 ; month:12 ; pages:191-202 |
| Links: |
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| DOI / URN: |
10.1007/s12650-017-0460-4 |
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| Katalog-ID: |
SPR026584018 |
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| 520 | |a Abstract Direct numerical simulation (DNS) with high spatial/temporal resolution of spatially developing turbulent boundary layers subject to very strong favorable pressure gradient (FPG) has been performed. The sudden acceleration imposed on the flow provokes a significant attenuation of turbulent intensities (Araya et al. in J Fluid Mech 775:189–200, 2015), particularly due to the dominance of pressure forces over approximately frozen Reynolds stresses, Narasimha and Sreenivasan (Adv Appl Mech 19:221–309, 1979). In this article, visualization of the DNS velocity field is carried out in order to evaluate the effect of very strong FPG on elementary coherent structures, such as low- and high-speed streaks, sweeps and ejections, quasi-streamwise and horseshoe vortices, and large-scale motions. An important symbiosis between quasi-streamwise vortices and low-speed streaks (or regeneration cycle) has been observed in the FPG zone. The destabilizing shear layers upstream of vortex heads in strong accelerated flows appear as very thin zones developing in the buffer region (%$20<y^+< 30%$). It seems that decaying %$uv'%$ in strong FPG flows (Araya et al. 2015) is principally due to the annihilation of sweeps, while ejections are responsible for the turbulence residual. Graphical Abstract | ||
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10.1007/s12650-017-0460-4 doi (DE-627)SPR026584018 (SPR)s12650-017-0460-4-e DE-627 ger DE-627 rakwb eng Araya, G. verfasserin (orcid)0000-0003-2934-6315 aut Visualization and assessment of turbulent coherent structures in laminarescent boundary layers 2017 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Visualization Society of Japan 2017 Abstract Direct numerical simulation (DNS) with high spatial/temporal resolution of spatially developing turbulent boundary layers subject to very strong favorable pressure gradient (FPG) has been performed. The sudden acceleration imposed on the flow provokes a significant attenuation of turbulent intensities (Araya et al. in J Fluid Mech 775:189–200, 2015), particularly due to the dominance of pressure forces over approximately frozen Reynolds stresses, Narasimha and Sreenivasan (Adv Appl Mech 19:221–309, 1979). In this article, visualization of the DNS velocity field is carried out in order to evaluate the effect of very strong FPG on elementary coherent structures, such as low- and high-speed streaks, sweeps and ejections, quasi-streamwise and horseshoe vortices, and large-scale motions. An important symbiosis between quasi-streamwise vortices and low-speed streaks (or regeneration cycle) has been observed in the FPG zone. The destabilizing shear layers upstream of vortex heads in strong accelerated flows appear as very thin zones developing in the buffer region (%$20<y^+< 30%$). It seems that decaying %$uv'%$ in strong FPG flows (Araya et al. 2015) is principally due to the annihilation of sweeps, while ejections are responsible for the turbulence residual. Graphical Abstract DNS (dpeaa)DE-He213 Coherent structures (dpeaa)DE-He213 Quasi-laminarization (dpeaa)DE-He213 Rodriguez, D. aut Enthalten in Journal of visualization Berlin : Springer, 1998 21(2017), 2 vom: 01. Dez., Seite 191-202 (DE-627)357174291 (DE-600)2094841-4 1875-8975 nnns volume:21 year:2017 number:2 day:01 month:12 pages:191-202 https://dx.doi.org/10.1007/s12650-017-0460-4 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_101 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_2472 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_2548 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 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 21 2017 2 01 12 191-202 |
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10.1007/s12650-017-0460-4 doi (DE-627)SPR026584018 (SPR)s12650-017-0460-4-e DE-627 ger DE-627 rakwb eng Araya, G. verfasserin (orcid)0000-0003-2934-6315 aut Visualization and assessment of turbulent coherent structures in laminarescent boundary layers 2017 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Visualization Society of Japan 2017 Abstract Direct numerical simulation (DNS) with high spatial/temporal resolution of spatially developing turbulent boundary layers subject to very strong favorable pressure gradient (FPG) has been performed. The sudden acceleration imposed on the flow provokes a significant attenuation of turbulent intensities (Araya et al. in J Fluid Mech 775:189–200, 2015), particularly due to the dominance of pressure forces over approximately frozen Reynolds stresses, Narasimha and Sreenivasan (Adv Appl Mech 19:221–309, 1979). In this article, visualization of the DNS velocity field is carried out in order to evaluate the effect of very strong FPG on elementary coherent structures, such as low- and high-speed streaks, sweeps and ejections, quasi-streamwise and horseshoe vortices, and large-scale motions. An important symbiosis between quasi-streamwise vortices and low-speed streaks (or regeneration cycle) has been observed in the FPG zone. The destabilizing shear layers upstream of vortex heads in strong accelerated flows appear as very thin zones developing in the buffer region (%$20<y^+< 30%$). It seems that decaying %$uv'%$ in strong FPG flows (Araya et al. 2015) is principally due to the annihilation of sweeps, while ejections are responsible for the turbulence residual. Graphical Abstract DNS (dpeaa)DE-He213 Coherent structures (dpeaa)DE-He213 Quasi-laminarization (dpeaa)DE-He213 Rodriguez, D. aut Enthalten in Journal of visualization Berlin : Springer, 1998 21(2017), 2 vom: 01. Dez., Seite 191-202 (DE-627)357174291 (DE-600)2094841-4 1875-8975 nnns volume:21 year:2017 number:2 day:01 month:12 pages:191-202 https://dx.doi.org/10.1007/s12650-017-0460-4 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_101 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_2472 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_2548 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 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 21 2017 2 01 12 191-202 |
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10.1007/s12650-017-0460-4 doi (DE-627)SPR026584018 (SPR)s12650-017-0460-4-e DE-627 ger DE-627 rakwb eng Araya, G. verfasserin (orcid)0000-0003-2934-6315 aut Visualization and assessment of turbulent coherent structures in laminarescent boundary layers 2017 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Visualization Society of Japan 2017 Abstract Direct numerical simulation (DNS) with high spatial/temporal resolution of spatially developing turbulent boundary layers subject to very strong favorable pressure gradient (FPG) has been performed. The sudden acceleration imposed on the flow provokes a significant attenuation of turbulent intensities (Araya et al. in J Fluid Mech 775:189–200, 2015), particularly due to the dominance of pressure forces over approximately frozen Reynolds stresses, Narasimha and Sreenivasan (Adv Appl Mech 19:221–309, 1979). In this article, visualization of the DNS velocity field is carried out in order to evaluate the effect of very strong FPG on elementary coherent structures, such as low- and high-speed streaks, sweeps and ejections, quasi-streamwise and horseshoe vortices, and large-scale motions. An important symbiosis between quasi-streamwise vortices and low-speed streaks (or regeneration cycle) has been observed in the FPG zone. The destabilizing shear layers upstream of vortex heads in strong accelerated flows appear as very thin zones developing in the buffer region (%$20<y^+< 30%$). It seems that decaying %$uv'%$ in strong FPG flows (Araya et al. 2015) is principally due to the annihilation of sweeps, while ejections are responsible for the turbulence residual. Graphical Abstract DNS (dpeaa)DE-He213 Coherent structures (dpeaa)DE-He213 Quasi-laminarization (dpeaa)DE-He213 Rodriguez, D. aut Enthalten in Journal of visualization Berlin : Springer, 1998 21(2017), 2 vom: 01. Dez., Seite 191-202 (DE-627)357174291 (DE-600)2094841-4 1875-8975 nnns volume:21 year:2017 number:2 day:01 month:12 pages:191-202 https://dx.doi.org/10.1007/s12650-017-0460-4 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_101 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_2472 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_2548 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 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 21 2017 2 01 12 191-202 |
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10.1007/s12650-017-0460-4 doi (DE-627)SPR026584018 (SPR)s12650-017-0460-4-e DE-627 ger DE-627 rakwb eng Araya, G. verfasserin (orcid)0000-0003-2934-6315 aut Visualization and assessment of turbulent coherent structures in laminarescent boundary layers 2017 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Visualization Society of Japan 2017 Abstract Direct numerical simulation (DNS) with high spatial/temporal resolution of spatially developing turbulent boundary layers subject to very strong favorable pressure gradient (FPG) has been performed. The sudden acceleration imposed on the flow provokes a significant attenuation of turbulent intensities (Araya et al. in J Fluid Mech 775:189–200, 2015), particularly due to the dominance of pressure forces over approximately frozen Reynolds stresses, Narasimha and Sreenivasan (Adv Appl Mech 19:221–309, 1979). In this article, visualization of the DNS velocity field is carried out in order to evaluate the effect of very strong FPG on elementary coherent structures, such as low- and high-speed streaks, sweeps and ejections, quasi-streamwise and horseshoe vortices, and large-scale motions. An important symbiosis between quasi-streamwise vortices and low-speed streaks (or regeneration cycle) has been observed in the FPG zone. The destabilizing shear layers upstream of vortex heads in strong accelerated flows appear as very thin zones developing in the buffer region (%$20<y^+< 30%$). It seems that decaying %$uv'%$ in strong FPG flows (Araya et al. 2015) is principally due to the annihilation of sweeps, while ejections are responsible for the turbulence residual. Graphical Abstract DNS (dpeaa)DE-He213 Coherent structures (dpeaa)DE-He213 Quasi-laminarization (dpeaa)DE-He213 Rodriguez, D. aut Enthalten in Journal of visualization Berlin : Springer, 1998 21(2017), 2 vom: 01. Dez., Seite 191-202 (DE-627)357174291 (DE-600)2094841-4 1875-8975 nnns volume:21 year:2017 number:2 day:01 month:12 pages:191-202 https://dx.doi.org/10.1007/s12650-017-0460-4 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_101 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_2472 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_2548 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 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 21 2017 2 01 12 191-202 |
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10.1007/s12650-017-0460-4 doi (DE-627)SPR026584018 (SPR)s12650-017-0460-4-e DE-627 ger DE-627 rakwb eng Araya, G. verfasserin (orcid)0000-0003-2934-6315 aut Visualization and assessment of turbulent coherent structures in laminarescent boundary layers 2017 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Visualization Society of Japan 2017 Abstract Direct numerical simulation (DNS) with high spatial/temporal resolution of spatially developing turbulent boundary layers subject to very strong favorable pressure gradient (FPG) has been performed. The sudden acceleration imposed on the flow provokes a significant attenuation of turbulent intensities (Araya et al. in J Fluid Mech 775:189–200, 2015), particularly due to the dominance of pressure forces over approximately frozen Reynolds stresses, Narasimha and Sreenivasan (Adv Appl Mech 19:221–309, 1979). In this article, visualization of the DNS velocity field is carried out in order to evaluate the effect of very strong FPG on elementary coherent structures, such as low- and high-speed streaks, sweeps and ejections, quasi-streamwise and horseshoe vortices, and large-scale motions. An important symbiosis between quasi-streamwise vortices and low-speed streaks (or regeneration cycle) has been observed in the FPG zone. The destabilizing shear layers upstream of vortex heads in strong accelerated flows appear as very thin zones developing in the buffer region (%$20<y^+< 30%$). It seems that decaying %$uv'%$ in strong FPG flows (Araya et al. 2015) is principally due to the annihilation of sweeps, while ejections are responsible for the turbulence residual. Graphical Abstract DNS (dpeaa)DE-He213 Coherent structures (dpeaa)DE-He213 Quasi-laminarization (dpeaa)DE-He213 Rodriguez, D. aut Enthalten in Journal of visualization Berlin : Springer, 1998 21(2017), 2 vom: 01. Dez., Seite 191-202 (DE-627)357174291 (DE-600)2094841-4 1875-8975 nnns volume:21 year:2017 number:2 day:01 month:12 pages:191-202 https://dx.doi.org/10.1007/s12650-017-0460-4 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_101 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_2472 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_2548 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 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 21 2017 2 01 12 191-202 |
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Araya, G. |
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Visualization and assessment of turbulent coherent structures in laminarescent boundary layers DNS (dpeaa)DE-He213 Coherent structures (dpeaa)DE-He213 Quasi-laminarization (dpeaa)DE-He213 |
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visualization and assessment of turbulent coherent structures in laminarescent boundary layers |
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Visualization and assessment of turbulent coherent structures in laminarescent boundary layers |
| abstract |
Abstract Direct numerical simulation (DNS) with high spatial/temporal resolution of spatially developing turbulent boundary layers subject to very strong favorable pressure gradient (FPG) has been performed. The sudden acceleration imposed on the flow provokes a significant attenuation of turbulent intensities (Araya et al. in J Fluid Mech 775:189–200, 2015), particularly due to the dominance of pressure forces over approximately frozen Reynolds stresses, Narasimha and Sreenivasan (Adv Appl Mech 19:221–309, 1979). In this article, visualization of the DNS velocity field is carried out in order to evaluate the effect of very strong FPG on elementary coherent structures, such as low- and high-speed streaks, sweeps and ejections, quasi-streamwise and horseshoe vortices, and large-scale motions. An important symbiosis between quasi-streamwise vortices and low-speed streaks (or regeneration cycle) has been observed in the FPG zone. The destabilizing shear layers upstream of vortex heads in strong accelerated flows appear as very thin zones developing in the buffer region (%$20<y^+< 30%$). It seems that decaying %$uv'%$ in strong FPG flows (Araya et al. 2015) is principally due to the annihilation of sweeps, while ejections are responsible for the turbulence residual. Graphical Abstract © The Visualization Society of Japan 2017 |
| abstractGer |
Abstract Direct numerical simulation (DNS) with high spatial/temporal resolution of spatially developing turbulent boundary layers subject to very strong favorable pressure gradient (FPG) has been performed. The sudden acceleration imposed on the flow provokes a significant attenuation of turbulent intensities (Araya et al. in J Fluid Mech 775:189–200, 2015), particularly due to the dominance of pressure forces over approximately frozen Reynolds stresses, Narasimha and Sreenivasan (Adv Appl Mech 19:221–309, 1979). In this article, visualization of the DNS velocity field is carried out in order to evaluate the effect of very strong FPG on elementary coherent structures, such as low- and high-speed streaks, sweeps and ejections, quasi-streamwise and horseshoe vortices, and large-scale motions. An important symbiosis between quasi-streamwise vortices and low-speed streaks (or regeneration cycle) has been observed in the FPG zone. The destabilizing shear layers upstream of vortex heads in strong accelerated flows appear as very thin zones developing in the buffer region (%$20<y^+< 30%$). It seems that decaying %$uv'%$ in strong FPG flows (Araya et al. 2015) is principally due to the annihilation of sweeps, while ejections are responsible for the turbulence residual. Graphical Abstract © The Visualization Society of Japan 2017 |
| abstract_unstemmed |
Abstract Direct numerical simulation (DNS) with high spatial/temporal resolution of spatially developing turbulent boundary layers subject to very strong favorable pressure gradient (FPG) has been performed. The sudden acceleration imposed on the flow provokes a significant attenuation of turbulent intensities (Araya et al. in J Fluid Mech 775:189–200, 2015), particularly due to the dominance of pressure forces over approximately frozen Reynolds stresses, Narasimha and Sreenivasan (Adv Appl Mech 19:221–309, 1979). In this article, visualization of the DNS velocity field is carried out in order to evaluate the effect of very strong FPG on elementary coherent structures, such as low- and high-speed streaks, sweeps and ejections, quasi-streamwise and horseshoe vortices, and large-scale motions. An important symbiosis between quasi-streamwise vortices and low-speed streaks (or regeneration cycle) has been observed in the FPG zone. The destabilizing shear layers upstream of vortex heads in strong accelerated flows appear as very thin zones developing in the buffer region (%$20<y^+< 30%$). It seems that decaying %$uv'%$ in strong FPG flows (Araya et al. 2015) is principally due to the annihilation of sweeps, while ejections are responsible for the turbulence residual. Graphical Abstract © The Visualization Society of Japan 2017 |
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Visualization and assessment of turbulent coherent structures in laminarescent boundary layers |
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https://dx.doi.org/10.1007/s12650-017-0460-4 |
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Rodriguez, D. |
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2024-07-03T21:40:50.088Z |
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