A Phenomenological Model for Turbulent Heat Flux in High-Speed Flows With Shock-Induced Flow Separation.
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| Title: | A Phenomenological Model for Turbulent Heat Flux in High-Speed Flows With Shock-Induced Flow Separation. |
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| Authors: | Pathak, Utkarsh1, Roy, Subhajit1, Sinha, Krishnendu2 |
| Source: | Journal of Fluids Engineering. May2018, Vol. 140 Issue 5, p1-9. 9p. |
| Subjects: | Heat flux, Flow separation, Navier-Stokes equations, Prandtl number, Fluid pressure |
| Abstract: | High-speed flows with shock waves impinging on turbulent boundary layers pose severe challenge to current computational methods and models. Specifically, the peak wall heat flux is grossly overpredicted by Reynolds-averaged Navier-Stokes (RANS) simulations using conventional turbulence models. This is because of the constant Prandtl number assumption, which fails in the presence of strong adverse pressure gradient (APG) of the shock waves. Experimental data suggest a reduction of the turbulent Prandtl number in boundary layers subjected to APG. We use a phenomenological approach to develop an algebraic model based on the available data and cast it in a form that can be used in high-speed flows with shock-induced flow separation. The shock-unsteadiness (SU) k-ω model is used as the baseline, since it gives good prediction of flow separation and the regions of APG. The new model gives marked improvement in the peak heat flux prediction near the reattachment point. The formulation is applicable to both attached and separated flows. Additionally, the simplicity of the formulation makes it easily implementable in existing numerical codes. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Fluids Engineering is the property of American Society of Mechanical Engineers and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 128631121 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: A Phenomenological Model for Turbulent Heat Flux in High-Speed Flows With Shock-Induced Flow Separation. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Pathak%2C+Utkarsh%22">Pathak, Utkarsh</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Roy%2C+Subhajit%22">Roy, Subhajit</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Sinha%2C+Krishnendu%22">Sinha, Krishnendu</searchLink><relatesTo>2</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Fluids+Engineering%22">Journal of Fluids Engineering</searchLink>. May2018, Vol. 140 Issue 5, p1-9. 9p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Heat+flux%22">Heat flux</searchLink><br /><searchLink fieldCode="DE" term="%22Flow+separation%22">Flow separation</searchLink><br /><searchLink fieldCode="DE" term="%22Navier-Stokes+equations%22">Navier-Stokes equations</searchLink><br /><searchLink fieldCode="DE" term="%22Prandtl+number%22">Prandtl number</searchLink><br /><searchLink fieldCode="DE" term="%22Fluid+pressure%22">Fluid pressure</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: High-speed flows with shock waves impinging on turbulent boundary layers pose severe challenge to current computational methods and models. Specifically, the peak wall heat flux is grossly overpredicted by Reynolds-averaged Navier-Stokes (RANS) simulations using conventional turbulence models. This is because of the constant Prandtl number assumption, which fails in the presence of strong adverse pressure gradient (APG) of the shock waves. Experimental data suggest a reduction of the turbulent Prandtl number in boundary layers subjected to APG. We use a phenomenological approach to develop an algebraic model based on the available data and cast it in a form that can be used in high-speed flows with shock-induced flow separation. The shock-unsteadiness (SU) k-ω model is used as the baseline, since it gives good prediction of flow separation and the regions of APG. The new model gives marked improvement in the peak heat flux prediction near the reattachment point. The formulation is applicable to both attached and separated flows. Additionally, the simplicity of the formulation makes it easily implementable in existing numerical codes. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Fluids Engineering is the property of American Society of Mechanical Engineers and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1115/1.4038760 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 9 StartPage: 1 Subjects: – SubjectFull: Heat flux Type: general – SubjectFull: Flow separation Type: general – SubjectFull: Navier-Stokes equations Type: general – SubjectFull: Prandtl number Type: general – SubjectFull: Fluid pressure Type: general Titles: – TitleFull: A Phenomenological Model for Turbulent Heat Flux in High-Speed Flows With Shock-Induced Flow Separation. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Pathak, Utkarsh – PersonEntity: Name: NameFull: Roy, Subhajit – PersonEntity: Name: NameFull: Sinha, Krishnendu IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 05 Text: May2018 Type: published Y: 2018 Identifiers: – Type: issn-print Value: 00982202 Numbering: – Type: volume Value: 140 – Type: issue Value: 5 Titles: – TitleFull: Journal of Fluids Engineering Type: main |
| ResultId | 1 |
