Title  Effect of inlet turbulence generation methods on Largeeddy Simulation results 
Author  
Name pinyin  WANG Yi

School number  11756010

Degree  博士

Discipline  计算流体力学

Supervisor  王建春^{}

Mentor unit  力学与航空航天工程系

Tutor of External Organizations  Hassan Hemida

Tutor units of foreign institutions  伯明翰大学

Publication Years  20220623

Submission date  20230515

University  伯明翰大学

Place of Publication  英国

Abstract  For large eddy simulation, it is critical to choose the suitable turbulent inlet boundary condition as it significantly affects the calculated flow field. In the thesis, the effect of different inlet boundary conditions including random method (RAND), Lund method and divergencefree synthetic eddies method (DFSEM) on the flow in a channel with a hump are investigated through largeeddy simulation. The simulation results are further compared with experimental data. It has been found that turbulence is nearly fully developed in the case based on Lund method, not fully developed in the case based on DFSEM and not developed in the case based on RAND method. In the flow region before the hump, mean velocity profiles in the case applying Lund method gradually fit the law of the wall as main flow moves towards the hump, but the simulation results based on RAND and DFSEM methods cannot fit the wall function. In the flow region after the hump, cases applying Lund and DFSEM methods could relative precisely predict the size of turbulent bubble and turbulent statistics profiles. While the case based on RAND method cannot capture the positions of flow separation and reattachment point and overestimates the turbulent bubble size. From this part, it could be found that different turbulent inflow generation methods have a manifested impact on the flow separation and reattachment after the hump. If the coherent turbulence is maintained in the approach flow, even though turbulent intensity is not large enough, the simulation can still predict the flow separation and turbulent bubble size relative precisely. From the results, even if the simulation based on the Lund method and DFSEM have a better performance than the simulation based on the RAND method, the results still cannot agree well with the experimental data. There are some possible reasons that result in the big difference. Firstly, the spanwise width of the simulation domain is relatively small. Additionally, the LES subgrid scale model has a slight impact on the results according to the previous research. Finally, the DFSEM is sensitive to the surface normal gradient schemes. Beside the choice of the turbulent inlet boundary condition (IBC) methods, the settings of each turbulent IBC method are critical as well. In this thesis, the effect of setting different IBC methods in LES using the Lund method, the divergencefree synthetic eddies method (DFSEM) and the digital filter method (DFM) on the simulation of the boundary layer over a flat plate is investigated. This research also fully explained the influences of different IBC methods on the results of turbulent kinetic energy budget terms, and it is found that the DFM and the DFSEM both have good performance. In addition, for the DFM and DFSEM, the input parameter such as turbulent length scales are hard to set generally without prior knowledge of the flow field. It is found that the simulation results based on these two methods with constant turbulent length scales of 0.41.0 times of the value of boundary layer thickness could agree well with the DNS results to a great extent after about 10 boundary layer thickness along the streamwise direction. Overall, it could be recommended that the DFM and the DFSEM can be used in this case with the constant input turbulent length scale about 0.41.0 times of the value of boundary thickness. 
Keywords  
Language  English

Training classes  联合培养

Enrollment Year  201801

Year of Degree Awarded  202212

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Data Source  人工提交

Document Type  Thesis 
Identifier  http://kc.sustech.edu.cn/handle/2SGJ60CL/535671 
Department  Department of Mechanics and Aerospace Engineering 
Recommended Citation GB/T 7714 
Wang Y. Effect of inlet turbulence generation methods on Largeeddy Simulation results[D]. 英国. 伯明翰大学,2022.

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