Simulations of Hairpin Vortices in the Presence of a Passive Scalar

Volume 1: Flow Manipulation and Active Control; Bio-Inspired Fluid Mechanics; Boundary Layer and High-Speed Flows; Fluids Engineering Education; Transport Phenomena in Energy Conversion and Mixing; Turbulent Flows; Vortex Dynamics; DNS/LES and Hybrid RANS/LES Methods; Fluid Structure Interaction; Fl Pub Date : 2018-07-15 DOI:10.1115/FEDSM2018-83158

R. Handler, D. Goldstein, S. Suryanarayanan

{"title":"Simulations of Hairpin Vortices in the Presence of a Passive Scalar","authors":"R. Handler, D. Goldstein, S. Suryanarayanan","doi":"10.1115/FEDSM2018-83158","DOIUrl":null,"url":null,"abstract":"We have performed simulations of hairpin vortex evolution in a channel flow in which a passive scalar was present. The hairpin was created by disturbing the flow using an impulsive and spatially localized body force. Simultaneous with the introduction of the force, a passive scalar was introduced. The simulations were performed using a spectral code at a Reynolds numbers of 3000. The results show that a significant fraction of the scalar material is spontaneously trapped in the core of a hairpin vortex. This can be understood by recalling that vortex lines are material lines in flows for which the effects of diffusion are small. We will also discuss the possible implications of these observations with respect to the introduction of active scalars coincident with regions of concentrated vorticity.","PeriodicalId":23480,"journal":{"name":"Volume 1: Flow Manipulation and Active Control; Bio-Inspired Fluid Mechanics; Boundary Layer and High-Speed Flows; Fluids Engineering Education; Transport Phenomena in Energy Conversion and Mixing; Turbulent Flows; Vortex Dynamics; DNS/LES and Hybrid RANS/LES Methods; Fluid Structure Interaction; Fl","volume":"33 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2018-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Volume 1: Flow Manipulation and Active Control; Bio-Inspired Fluid Mechanics; Boundary Layer and High-Speed Flows; Fluids Engineering Education; Transport Phenomena in Energy Conversion and Mixing; Turbulent Flows; Vortex Dynamics; DNS/LES and Hybrid RANS/LES Methods; Fluid Structure Interaction; Fl","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1115/FEDSM2018-83158","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}

引用次数: 0

Abstract

We have performed simulations of hairpin vortex evolution in a channel flow in which a passive scalar was present. The hairpin was created by disturbing the flow using an impulsive and spatially localized body force. Simultaneous with the introduction of the force, a passive scalar was introduced. The simulations were performed using a spectral code at a Reynolds numbers of 3000. The results show that a significant fraction of the scalar material is spontaneously trapped in the core of a hairpin vortex. This can be understood by recalling that vortex lines are material lines in flows for which the effects of diffusion are small. We will also discuss the possible implications of these observations with respect to the introduction of active scalars coincident with regions of concentrated vorticity.

查看原文本刊更多论文

被动标量存在下发夹涡的模拟

本文对存在被动标量的通道流中发夹涡的演化进行了模拟。发夹是通过使用脉冲和空间局部的身体力来干扰流动而产生的。在引入力的同时，引入了一个被动标量。模拟采用雷诺数为3000的谱码进行。结果表明，相当一部分标量物质自发地被困在发夹涡的核心。回想一下，涡流线是流动中的物质线，扩散对其影响很小，这一点可以理解。我们还将讨论这些观测在引入与涡度集中区域一致的活动标量方面可能产生的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Volume 1: Flow Manipulation and Active Control; Bio-Inspired Fluid Mechanics; Boundary Layer and High-Speed Flows; Fluids Engineering Education; Transport Phenomena in Energy Conversion and Mixing; Turbulent Flows; Vortex Dynamics; DNS/LES and Hybrid RANS/LES Methods; Fluid Structure Interaction; Fl

自引率

0.00%

发文量