基于大涡模拟的离散格式改进方法及应用

doi:10.13229/j.cnki.jdxbgxb20180861

Abstract

Abstract:

In the application of large eddy simulation in CFD numerical simulation, higher-order discrete schemes can improve the numerical accuracy, but higher mesh resolution need will greatly increase the computational complexity. By improving the existing discrete schemes reasonably to establish more efficient and accurate discrete schemes, the numerical accuracy can be guaranteed with lower requirements of mesh resolution. In this paper, based on two commonly used discrete schemes of Gauss linear and upwind, an improved discrete scheme is established. Based on the experimental results of Dshap, the simulation results of large eddy simulation under the three discrete schemes are compared and analyzed. The comparison results show that the improved discrete scheme is more efficient and accurate. Further, the improved discrete scheme is applied to analyze the outflow field of Dshap under different ground clearance. The analysis shows that the ground can improve aerodynamic performance of the model, and appropriate ground clearance can provide the model a lower aerodynamic drag while reducing the aerodynamic lift. The research of the improved discrete scheme in this paper may provide an reference for the application of large eddy simulation in vehicle external flow field simulation.

Key words: vehicle engineering, discrete schemes, large eddy simulation（LES）, ground effect, computational fluid dynamics（CFD）

CLC Number:

U461.1

Xin CHEN,Xin-jian RUAN,Ming LI,Ning WANG,Jia-ning WANG,Kai-xuan PAN. Application of modified discrete scheme based onlarge eddy simulation[J].Journal of Jilin University(Engineering and Technology Edition), 2019, 49(6): 1756-1763.

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离散格式	C _d	S _t
Gauss linear	0.78	0.225
Upwind	0.81	0.229
Lust	0.75	0.227
试验^[13]	0.73	0.221

	C _p	C _v	C _l	S _t
L/D=0.4	1.680	0.137	0.162	0.273
L/D=0.8	1.690	0.128	0.146	0.264
L/D=1.2	1.620	0.119	0.156	0.276
L/D=1.6	0.871	0.096	0.136	0.271

Application of modified discrete scheme based onlarge eddy simulation

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