Wind and Structures

  • 제20권4호
  • /
  • Pages.579-607
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  • 2015
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  • 1226-6116(pISSN)
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  • 1598-6225(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

A combination method to generate fluctuating boundary conditions for large eddy simulation

  • Wang, Dayang (School of Civil Engineering, Guangzhou University) ;
  • Yu, X.J. (Department of Civil and Environmental Engineering, Hong Kong University of Science and Technology, Clear Water Bay) ;
  • Zhou, Y. (School of Civil Engineering, Guangzhou University) ;
  • Tse, K.T. (Department of Civil and Environmental Engineering, Hong Kong University of Science and Technology, Clear Water Bay)
  • 투고 : 2014.07.16
  • 심사 : 2015.03.06
  • 발행 : 2015.04.25
⟨ 이전 논문 다음 논문 ⟩

초록

A Combination Random Flow Generation (CRFG) technique for obtaining the fluctuating inflow boundary conditions for Large Eddy Simulation (LES) is proposed. The CRFG technique was developed by combining the typical RFG technique with a novel calculation of k and ${\varepsilon}$ to estimate the length- and time-scales (l, ${\tau}$) of the target fluctuating turbulence field used as the inflow boundary conditions. Through comparatively analyzing the CRFG technique and other existing numerical/experimental results, the CRFG technique was verified for the generation of turbulent wind velocity fields with prescribed turbulent statistics. Using the turbulent velocity fluctuations generated by the CRFG technique, a series of LESs were conducted to investigate the wind flow around S-, R-, L- and U-shaped building models. As the pressures of the models were also measured in wind tunnel tests, the validity of the LES, and the effectiveness of the inflow boundary generated by the CRFG techniques were evaluated through comparing the simulation results to the wind tunnel measurements. The comparison showed that the LES accurately and reliably simulates the wind-induced pressure distributions on the building surfaces, which indirectly validates the CRFG technique in generating realistic fluctuating wind velocities for use in the LES. In addition to the pressure distribution, the LES results were investigated in terms of wind velocity profiles around the building models to reveal the wind flow dynamics around bluff bodies. The LES results quantitatively showed the decay of the bluff body influence when the flow moves away from the building model.

키워드

과제정보

연구 과제 주관 기관 : National Natural Science Foundation of China

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