Reconstruction of skin friction topology in complex separated flows

Abstract This paper describes a theoretical method for reconstruction of the skin friction topology in complex separated flows, which is developed based on the exact relation between skin friction and surface pressure through the boundary enstrophy flux (BEF). The key of this method is that a skin f...
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Autor*in:	Tianshu Liu [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2023

Schlagwörter:	Skin friction Surface pressure Boundary enstrophy flux Flow separation Topology Inverse problem

Übergeordnetes Werk:	In: Advances in Aerodynamics - SpringerOpen, 2020, 5(2023), 1, Seite 35
Übergeordnetes Werk:	volume:5 ; year:2023 ; number:1 ; pages:35

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.1186/s42774-023-00157-x

Katalog-ID:	DOAJ101070845

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520			\|a Abstract This paper describes a theoretical method for reconstruction of the skin friction topology in complex separated flows, which is developed based on the exact relation between skin friction and surface pressure through the boundary enstrophy flux (BEF). The key of this method is that a skin friction field is reconstructed from a surface pressure field as an inverse problem by applying a variational method. For applications, the approximate method is proposed, where the composite surface pressure field is given by a linear superposition of the base-flow surface pressure field and the surface pressure variation field and the base-flow BEF field is used as the first-order approximation. This approximate method is constructive in a mathematical sense since a complex skin friction field in separated flows can be reconstructed from some elemental skin friction structures (skin friction source/sink, vortex and their combinations) by a linear superposition of some simple surface pressure structures. The distinct topological features, such as critical points, separation lines and attachment lines, naturally occur as a result of such reconstruction. As examples, some elemental skin friction structures in separated flows are reconstructed in simulations, and the skin friction fields in shock-wave/boundary-layer interactions (SWBLIs) are reconstructed from pressure sensitive paint (PSP) images obtained in wind tunnel experiments.
650		4	\|a Skin friction
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allfields	10.1186/s42774-023-00157-x doi (DE-627)DOAJ101070845 (DE-599)DOAJ5e57d118257146bfa264bf32441867a7 DE-627 ger DE-627 rakwb eng TA1-2040 TL1-4050 Tianshu Liu verfasserin aut Reconstruction of skin friction topology in complex separated flows 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abstract This paper describes a theoretical method for reconstruction of the skin friction topology in complex separated flows, which is developed based on the exact relation between skin friction and surface pressure through the boundary enstrophy flux (BEF). The key of this method is that a skin friction field is reconstructed from a surface pressure field as an inverse problem by applying a variational method. For applications, the approximate method is proposed, where the composite surface pressure field is given by a linear superposition of the base-flow surface pressure field and the surface pressure variation field and the base-flow BEF field is used as the first-order approximation. This approximate method is constructive in a mathematical sense since a complex skin friction field in separated flows can be reconstructed from some elemental skin friction structures (skin friction source/sink, vortex and their combinations) by a linear superposition of some simple surface pressure structures. The distinct topological features, such as critical points, separation lines and attachment lines, naturally occur as a result of such reconstruction. As examples, some elemental skin friction structures in separated flows are reconstructed in simulations, and the skin friction fields in shock-wave/boundary-layer interactions (SWBLIs) are reconstructed from pressure sensitive paint (PSP) images obtained in wind tunnel experiments. Skin friction Surface pressure Boundary enstrophy flux Flow separation Topology Inverse problem Engineering (General). Civil engineering (General) Motor vehicles. Aeronautics. Astronautics In Advances in Aerodynamics SpringerOpen, 2020 5(2023), 1, Seite 35 (DE-627)104833063X 25246992 nnns volume:5 year:2023 number:1 pages:35 https://doi.org/10.1186/s42774-023-00157-x kostenfrei https://doaj.org/article/5e57d118257146bfa264bf32441867a7 kostenfrei https://doi.org/10.1186/s42774-023-00157-x kostenfrei https://doaj.org/toc/2524-6992 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 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_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 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_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 5 2023 1 35
spelling	10.1186/s42774-023-00157-x doi (DE-627)DOAJ101070845 (DE-599)DOAJ5e57d118257146bfa264bf32441867a7 DE-627 ger DE-627 rakwb eng TA1-2040 TL1-4050 Tianshu Liu verfasserin aut Reconstruction of skin friction topology in complex separated flows 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abstract This paper describes a theoretical method for reconstruction of the skin friction topology in complex separated flows, which is developed based on the exact relation between skin friction and surface pressure through the boundary enstrophy flux (BEF). The key of this method is that a skin friction field is reconstructed from a surface pressure field as an inverse problem by applying a variational method. For applications, the approximate method is proposed, where the composite surface pressure field is given by a linear superposition of the base-flow surface pressure field and the surface pressure variation field and the base-flow BEF field is used as the first-order approximation. This approximate method is constructive in a mathematical sense since a complex skin friction field in separated flows can be reconstructed from some elemental skin friction structures (skin friction source/sink, vortex and their combinations) by a linear superposition of some simple surface pressure structures. The distinct topological features, such as critical points, separation lines and attachment lines, naturally occur as a result of such reconstruction. As examples, some elemental skin friction structures in separated flows are reconstructed in simulations, and the skin friction fields in shock-wave/boundary-layer interactions (SWBLIs) are reconstructed from pressure sensitive paint (PSP) images obtained in wind tunnel experiments. Skin friction Surface pressure Boundary enstrophy flux Flow separation Topology Inverse problem Engineering (General). Civil engineering (General) Motor vehicles. Aeronautics. Astronautics In Advances in Aerodynamics SpringerOpen, 2020 5(2023), 1, Seite 35 (DE-627)104833063X 25246992 nnns volume:5 year:2023 number:1 pages:35 https://doi.org/10.1186/s42774-023-00157-x kostenfrei https://doaj.org/article/5e57d118257146bfa264bf32441867a7 kostenfrei https://doi.org/10.1186/s42774-023-00157-x kostenfrei https://doaj.org/toc/2524-6992 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 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_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 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_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 5 2023 1 35
allfields_unstemmed	10.1186/s42774-023-00157-x doi (DE-627)DOAJ101070845 (DE-599)DOAJ5e57d118257146bfa264bf32441867a7 DE-627 ger DE-627 rakwb eng TA1-2040 TL1-4050 Tianshu Liu verfasserin aut Reconstruction of skin friction topology in complex separated flows 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abstract This paper describes a theoretical method for reconstruction of the skin friction topology in complex separated flows, which is developed based on the exact relation between skin friction and surface pressure through the boundary enstrophy flux (BEF). The key of this method is that a skin friction field is reconstructed from a surface pressure field as an inverse problem by applying a variational method. For applications, the approximate method is proposed, where the composite surface pressure field is given by a linear superposition of the base-flow surface pressure field and the surface pressure variation field and the base-flow BEF field is used as the first-order approximation. This approximate method is constructive in a mathematical sense since a complex skin friction field in separated flows can be reconstructed from some elemental skin friction structures (skin friction source/sink, vortex and their combinations) by a linear superposition of some simple surface pressure structures. The distinct topological features, such as critical points, separation lines and attachment lines, naturally occur as a result of such reconstruction. As examples, some elemental skin friction structures in separated flows are reconstructed in simulations, and the skin friction fields in shock-wave/boundary-layer interactions (SWBLIs) are reconstructed from pressure sensitive paint (PSP) images obtained in wind tunnel experiments. Skin friction Surface pressure Boundary enstrophy flux Flow separation Topology Inverse problem Engineering (General). Civil engineering (General) Motor vehicles. Aeronautics. Astronautics In Advances in Aerodynamics SpringerOpen, 2020 5(2023), 1, Seite 35 (DE-627)104833063X 25246992 nnns volume:5 year:2023 number:1 pages:35 https://doi.org/10.1186/s42774-023-00157-x kostenfrei https://doaj.org/article/5e57d118257146bfa264bf32441867a7 kostenfrei https://doi.org/10.1186/s42774-023-00157-x kostenfrei https://doaj.org/toc/2524-6992 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 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_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 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_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 5 2023 1 35
allfieldsGer	10.1186/s42774-023-00157-x doi (DE-627)DOAJ101070845 (DE-599)DOAJ5e57d118257146bfa264bf32441867a7 DE-627 ger DE-627 rakwb eng TA1-2040 TL1-4050 Tianshu Liu verfasserin aut Reconstruction of skin friction topology in complex separated flows 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abstract This paper describes a theoretical method for reconstruction of the skin friction topology in complex separated flows, which is developed based on the exact relation between skin friction and surface pressure through the boundary enstrophy flux (BEF). The key of this method is that a skin friction field is reconstructed from a surface pressure field as an inverse problem by applying a variational method. For applications, the approximate method is proposed, where the composite surface pressure field is given by a linear superposition of the base-flow surface pressure field and the surface pressure variation field and the base-flow BEF field is used as the first-order approximation. This approximate method is constructive in a mathematical sense since a complex skin friction field in separated flows can be reconstructed from some elemental skin friction structures (skin friction source/sink, vortex and their combinations) by a linear superposition of some simple surface pressure structures. The distinct topological features, such as critical points, separation lines and attachment lines, naturally occur as a result of such reconstruction. As examples, some elemental skin friction structures in separated flows are reconstructed in simulations, and the skin friction fields in shock-wave/boundary-layer interactions (SWBLIs) are reconstructed from pressure sensitive paint (PSP) images obtained in wind tunnel experiments. Skin friction Surface pressure Boundary enstrophy flux Flow separation Topology Inverse problem Engineering (General). Civil engineering (General) Motor vehicles. Aeronautics. Astronautics In Advances in Aerodynamics SpringerOpen, 2020 5(2023), 1, Seite 35 (DE-627)104833063X 25246992 nnns volume:5 year:2023 number:1 pages:35 https://doi.org/10.1186/s42774-023-00157-x kostenfrei https://doaj.org/article/5e57d118257146bfa264bf32441867a7 kostenfrei https://doi.org/10.1186/s42774-023-00157-x kostenfrei https://doaj.org/toc/2524-6992 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 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_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 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_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 5 2023 1 35
allfieldsSound	10.1186/s42774-023-00157-x doi (DE-627)DOAJ101070845 (DE-599)DOAJ5e57d118257146bfa264bf32441867a7 DE-627 ger DE-627 rakwb eng TA1-2040 TL1-4050 Tianshu Liu verfasserin aut Reconstruction of skin friction topology in complex separated flows 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abstract This paper describes a theoretical method for reconstruction of the skin friction topology in complex separated flows, which is developed based on the exact relation between skin friction and surface pressure through the boundary enstrophy flux (BEF). The key of this method is that a skin friction field is reconstructed from a surface pressure field as an inverse problem by applying a variational method. For applications, the approximate method is proposed, where the composite surface pressure field is given by a linear superposition of the base-flow surface pressure field and the surface pressure variation field and the base-flow BEF field is used as the first-order approximation. This approximate method is constructive in a mathematical sense since a complex skin friction field in separated flows can be reconstructed from some elemental skin friction structures (skin friction source/sink, vortex and their combinations) by a linear superposition of some simple surface pressure structures. The distinct topological features, such as critical points, separation lines and attachment lines, naturally occur as a result of such reconstruction. As examples, some elemental skin friction structures in separated flows are reconstructed in simulations, and the skin friction fields in shock-wave/boundary-layer interactions (SWBLIs) are reconstructed from pressure sensitive paint (PSP) images obtained in wind tunnel experiments. Skin friction Surface pressure Boundary enstrophy flux Flow separation Topology Inverse problem Engineering (General). Civil engineering (General) Motor vehicles. Aeronautics. Astronautics In Advances in Aerodynamics SpringerOpen, 2020 5(2023), 1, Seite 35 (DE-627)104833063X 25246992 nnns volume:5 year:2023 number:1 pages:35 https://doi.org/10.1186/s42774-023-00157-x kostenfrei https://doaj.org/article/5e57d118257146bfa264bf32441867a7 kostenfrei https://doi.org/10.1186/s42774-023-00157-x kostenfrei https://doaj.org/toc/2524-6992 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 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_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 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_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 5 2023 1 35
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The key of this method is that a skin friction field is reconstructed from a surface pressure field as an inverse problem by applying a variational method. For applications, the approximate method is proposed, where the composite surface pressure field is given by a linear superposition of the base-flow surface pressure field and the surface pressure variation field and the base-flow BEF field is used as the first-order approximation. This approximate method is constructive in a mathematical sense since a complex skin friction field in separated flows can be reconstructed from some elemental skin friction structures (skin friction source/sink, vortex and their combinations) by a linear superposition of some simple surface pressure structures. The distinct topological features, such as critical points, separation lines and attachment lines, naturally occur as a result of such reconstruction. 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callnumber-first	T - Technology
author	Tianshu Liu
spellingShingle	Tianshu Liu misc TA1-2040 misc TL1-4050 misc Skin friction misc Surface pressure misc Boundary enstrophy flux misc Flow separation misc Topology misc Inverse problem misc Engineering (General). Civil engineering (General) misc Motor vehicles. Aeronautics. Astronautics Reconstruction of skin friction topology in complex separated flows
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topic_title	TA1-2040 TL1-4050 Reconstruction of skin friction topology in complex separated flows Skin friction Surface pressure Boundary enstrophy flux Flow separation Topology Inverse problem
topic	misc TA1-2040 misc TL1-4050 misc Skin friction misc Surface pressure misc Boundary enstrophy flux misc Flow separation misc Topology misc Inverse problem misc Engineering (General). Civil engineering (General) misc Motor vehicles. Aeronautics. Astronautics
topic_unstemmed	misc TA1-2040 misc TL1-4050 misc Skin friction misc Surface pressure misc Boundary enstrophy flux misc Flow separation misc Topology misc Inverse problem misc Engineering (General). Civil engineering (General) misc Motor vehicles. Aeronautics. Astronautics
topic_browse	misc TA1-2040 misc TL1-4050 misc Skin friction misc Surface pressure misc Boundary enstrophy flux misc Flow separation misc Topology misc Inverse problem misc Engineering (General). Civil engineering (General) misc Motor vehicles. Aeronautics. Astronautics
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title	Reconstruction of skin friction topology in complex separated flows
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title_full	Reconstruction of skin friction topology in complex separated flows
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title_sort	reconstruction of skin friction topology in complex separated flows
callnumber	TA1-2040
title_auth	Reconstruction of skin friction topology in complex separated flows
abstract	Abstract This paper describes a theoretical method for reconstruction of the skin friction topology in complex separated flows, which is developed based on the exact relation between skin friction and surface pressure through the boundary enstrophy flux (BEF). The key of this method is that a skin friction field is reconstructed from a surface pressure field as an inverse problem by applying a variational method. For applications, the approximate method is proposed, where the composite surface pressure field is given by a linear superposition of the base-flow surface pressure field and the surface pressure variation field and the base-flow BEF field is used as the first-order approximation. This approximate method is constructive in a mathematical sense since a complex skin friction field in separated flows can be reconstructed from some elemental skin friction structures (skin friction source/sink, vortex and their combinations) by a linear superposition of some simple surface pressure structures. The distinct topological features, such as critical points, separation lines and attachment lines, naturally occur as a result of such reconstruction. As examples, some elemental skin friction structures in separated flows are reconstructed in simulations, and the skin friction fields in shock-wave/boundary-layer interactions (SWBLIs) are reconstructed from pressure sensitive paint (PSP) images obtained in wind tunnel experiments.
abstractGer	Abstract This paper describes a theoretical method for reconstruction of the skin friction topology in complex separated flows, which is developed based on the exact relation between skin friction and surface pressure through the boundary enstrophy flux (BEF). The key of this method is that a skin friction field is reconstructed from a surface pressure field as an inverse problem by applying a variational method. For applications, the approximate method is proposed, where the composite surface pressure field is given by a linear superposition of the base-flow surface pressure field and the surface pressure variation field and the base-flow BEF field is used as the first-order approximation. This approximate method is constructive in a mathematical sense since a complex skin friction field in separated flows can be reconstructed from some elemental skin friction structures (skin friction source/sink, vortex and their combinations) by a linear superposition of some simple surface pressure structures. The distinct topological features, such as critical points, separation lines and attachment lines, naturally occur as a result of such reconstruction. As examples, some elemental skin friction structures in separated flows are reconstructed in simulations, and the skin friction fields in shock-wave/boundary-layer interactions (SWBLIs) are reconstructed from pressure sensitive paint (PSP) images obtained in wind tunnel experiments.
abstract_unstemmed	Abstract This paper describes a theoretical method for reconstruction of the skin friction topology in complex separated flows, which is developed based on the exact relation between skin friction and surface pressure through the boundary enstrophy flux (BEF). The key of this method is that a skin friction field is reconstructed from a surface pressure field as an inverse problem by applying a variational method. For applications, the approximate method is proposed, where the composite surface pressure field is given by a linear superposition of the base-flow surface pressure field and the surface pressure variation field and the base-flow BEF field is used as the first-order approximation. This approximate method is constructive in a mathematical sense since a complex skin friction field in separated flows can be reconstructed from some elemental skin friction structures (skin friction source/sink, vortex and their combinations) by a linear superposition of some simple surface pressure structures. The distinct topological features, such as critical points, separation lines and attachment lines, naturally occur as a result of such reconstruction. As examples, some elemental skin friction structures in separated flows are reconstructed in simulations, and the skin friction fields in shock-wave/boundary-layer interactions (SWBLIs) are reconstructed from pressure sensitive paint (PSP) images obtained in wind tunnel experiments.
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title_short	Reconstruction of skin friction topology in complex separated flows
url	https://doi.org/10.1186/s42774-023-00157-x https://doaj.org/article/5e57d118257146bfa264bf32441867a7 https://doaj.org/toc/2524-6992
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Reconstruction of skin friction topology in complex separated flows

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