Wind and Structures

테크노프레스 (Techno-Press)
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Generation of inflow turbulent boundary layer for LES computation

  • Kondo, K. (Kajima Technical Research Institute) ;
  • Tsuchiya, M. (Kajima Technical Research Institute) ;
  • Mochida, A. (Graduate School of Engineering, Tohoku Univ.) ;
  • Murakami, S. (Keio University)
  • 발행 : 2002.04.25
⟨ 이전 논문 다음 논문 ⟩

초록

When predicting unsteady flow and pressure fields around a structure in a turbulent boundary layer by Large Eddy Simulation (LES), velocity fluctuations of turbulence (inflow turbulence), which reproduce statistical characteristics of the turbulent boundary layer, must be given at the inflow boundary. However, research has just started on development of a method for generating inflow turbulence that satisfies the prescribed turbulence statistics, and many issues still remain to be resolved. In our previous study, we proposed a method for generating inflow turbulence and confirmed its applicability by LES of an isotropic turbulence. In this study, the generation method was applied to a turbulent boundary layer developed over a flat plate, and the reproducibility of turbulence statistics predicted by LES computation was examined. Statistical characteristics of a turbulent boundary layer developed over a flat plate were investigated by a wind tunnel test for modeling the cross-spectral density matrix for use as targets of inflow turbulence generation for LES computation. Furthermore, we investigated how the degree of correspondence of the cross-spectral density matrix of the generated inflow turbulence with the target cross-spectral density matrix estimated by the wind tunnel test influenced the LES results for the turbulent boundary layer. The results of this study confirmed that the reproduction of cross-spectra of the normal components of the inflow turbulence generation is very important in reproducing power spectra, spatial correlation and turbulence statistics of wind velocity in LES.

키워드

참고문헌

  1. Dai, T., Kobayashi, T. and Taniguchi, N. (1994), "Large eddy simulation of plane turbulent jet flow using a new outflow velocity boundary condition", JSME Int. Journal, Series B, 37(2), 242-253. https://doi.org/10.1299/jsmeb.37.242
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  3. Iizuka, S., Murakami, S., Tsuchiya, N. and Mochida, A. (1999), "LES of flow past 2D cylinder with imposed inflow turbulence", Proc. 10th Int. Conf. Wind Eng., 2, 1291-1298.
  4. Kondo, K., Mochida, A. and Murakami, S. (1997), "Generation of velocity fluctuations for inflow boundary condition of LES", J. Wind Eng. Ind. Aerod., 67 & 68, 51-64.
  5. Lund, T.S., Wu, X. and Squires, K.D. (1998), "Generation of turbulent inflow data for spatially-developing boundary layer similations", J. Computational Physics, No. 140, 233-258.
  6. Maruyama, T., Rodi, W., Maruyama, Y. and Hiraoka, H. (1999), "Large eddy simulation of the turbulent boundary layer behind roughness elements using an artificially generated inflow", J. Wind Eng. Ind. Aerod., 83, 381-392. https://doi.org/10.1016/S0167-6105(99)00087-2
  7. Werner, H. and Wengle, H. (1991), "Large eddy simulation of turbulent flow over and around a cube in plane channel", Proc. 8th Symp. on Turbulent Shear Flows, 19-4.

피인용 문헌

  1. Sensitivity analysis of initial condition parameters on the transitional temporal turbulent mixing layer vol.9, 2008, https://doi.org/10.1080/14685240801964912
  2. Generation of turbulent inflow and initial conditions based on multi-correlated random fields vol.57, pp.1, 2008, https://doi.org/10.1002/fld.1627
  3. Cholesky decomposition–based generation of artificial inflow turbulence including scalar fluctuation vol.159, 2017, https://doi.org/10.1016/j.compfluid.2017.09.005