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| Investigation on the aerodynamic characteristics of the seepage wind through windbreak using large eddy simulation |
| Received:April 25, 2014 Revised:June 23, 2014 |
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| DOI：10.7511/jslx201504014 |
| KeyWord:large eddy simulation immersed boundary method cylinder flow aerodynamics |
| Author | Institution |
| 许栋 |
天津大学 水利工程仿真与安全国家重点实验室, 天津 ;上海交通大学 高新船舶开发装备协同创新中心, 上海 |
| 申振东 |
天津大学 水利工程仿真与安全国家重点实验室, 天津 |
| 高喜峰 |
天津大学 水利工程仿真与安全国家重点实验室, 天津 |
| 薛法兴 |
格瑞天津科技发展有限公司, 天津 |
| 夏绪林 |
格瑞天津科技发展有限公司, 天津 |
| 及春宁 |
天津大学 水利工程仿真与安全国家重点实验室, 天津 |
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| Abstract: |
| Large eddy simulations model were established for turbulent flow of incompressible viscous fluids based on finite volume method.Smagorinsky-Lilly model was used as the subgrid model and immersed boundary method (IBM) was introduced to implement nonslip wall boundary conditions.Investigations were carried out for seepage winds from windbreak with Reynolds numbers ranging from 30 to 30000.Based on the simulation results,four typical flow zones were identified for the seepage wind behind butterfly-shaped windbreak.There are large scale stratified shear flow structures in the flow,which are caused by the butterfly shape and significantly enhance energy dissipation.Laminar to turbulent flow transition occurs at Reynolds number of around 300.When Reynolds number increases to 3000,the flow develops to fully turbulence with streamwise turbulent intensity up to about 70%.The drag resistance of windbreak is much larger than the linear adding of individual orifice plate flows,which implies that the interaction among the jet flows and the shear flow structures may significantly contribute to the flow resistance.This provides scientific support to saving windbreak material via optimizing porthole arrangements and the windbreak shapes. |
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