Structure and role of the pressure Hessian in regions of strong vorticity in turbulence
文献类型：期刊论文
| 作者 | Yang PF(杨鹏飞)3,4,5,6 ; Xu, H3,4; Pumir, A1,2; He GW(何国威)5,6
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| 刊名 | JOURNAL OF FLUID MECHANICS
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| 出版日期 | 2024-03-15 |
| 卷号 | 983页码:12 |
| 关键词 | turbulence theory turbulence modelling vortex dynamics |
| ISSN号 | 0022-1120 |
| DOI | 10.1017/jfm.2024.143 |
| 通讯作者 | Pumir, A.(alain.pumir@ens-lyon.fr) ; He, G. W.(hgw@lnm.imech.ac.cn) |
| 英文摘要 | Amplification of velocity gradients, a key feature of turbulent flows, is affected by the non-local character of the incompressible fluid equations expressed by the second derivative (Hessian) of the pressure field. By analysing the structure of the flow in regions where the vorticity is the highest, we propose an approximate expression for the pressure Hessian in terms of the local vorticity, consistent with the existence of intense vortex tubes. Contrary to the often used simplification of an isotropic form for the pressure Hessian, which in effect inhibits vortex stretching, the proposed approximate form of the pressure Hessian enables much stronger vortex stretching. The prediction of the approximation proposed here is validated with results of direct numerical simulations of turbulent flows. |
| 分类号 | 一类/力学重要期刊 |
| WOS关键词 | VELOCITY-GRADIENT TENSOR ; DIRECT NUMERICAL SIMULATIONS ; RESTRICTED EULER ; DYNAMICS ; INVARIANTS ; MODELS |
| 资助项目 | Natural Science Foundation of China (NSFC) Basic Science Center Program[11988102] ; NSFC[12202452] ; NSFC[11672157] ; NSFC[91852104] ; Agence Nationale de la Recherche (ANR)[ANR-20-CE30-0035] |
| WOS研究方向 | Mechanics ; Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:001192369800001 |
| 资助机构 | Natural Science Foundation of China (NSFC) Basic Science Center Program ; NSFC ; Agence Nationale de la Recherche (ANR) |
| 其他责任者 | Pumir, A. ; He, G. W. |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/94836]  |
| 专题 | 力学研究所_非线性力学国家重点实验室 |
| 作者单位 | 1.Max Planck Inst Dynam & Selforg, Fassberg 17, D-37077 Gottingen, Germany 2.Univ Lyon, Ecole Normale Super Lyon, Lab Phys, CNRS, F-69007 Lyon, France; 3.Tsinghua Univ, Sch Aerosp Engn, Beijing 100084, Peoples R China; 4.Tsinghua Univ, Ctr Combust Energy, Beijing 100084, Peoples R China; 5.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China; 6.Inst Mech, Chinese Acad Sci, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China; |
| 推荐引用方式 GB/T 7714 | Yang PF,Xu, H,Pumir, A,et al. Structure and role of the pressure Hessian in regions of strong vorticity in turbulence[J]. JOURNAL OF FLUID MECHANICS,2024,983:12. |
| APA | 杨鹏飞,Xu, H,Pumir, A,&何国威.(2024).Structure and role of the pressure Hessian in regions of strong vorticity in turbulence.JOURNAL OF FLUID MECHANICS,983,12. |
| MLA | 杨鹏飞,et al."Structure and role of the pressure Hessian in regions of strong vorticity in turbulence".JOURNAL OF FLUID MECHANICS 983(2024):12. |
入库方式： OAI收割
来源：力学研究所
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