Research on Improved Delay Detached Eddy Simulation Method Based on SA Model
The demand for fine simulation of flow separation problem is increasing day by day,and tradi-tional URANS method can't meet the requirements of refined simulation.Based on the RANS/LES hybrid method,this paper analyzes the Grid Induced Separation(GIS)problem existing in DES method and the Log Level Mismatch(LLM)problem existing in DDES method,the IDDES method is further developed.The typical model examples of flow around a single cylinder,subsonic deltawing and CRM-HL high lift are verified by simulation.The numerical results show that compared with the URANS method,the DES hybrid method has higher simulation accuracy and can better reflect the vortex system structure with a-bundant flow field.Compared with DES and DDES methods,the IDDES method overcomes the defects of DES and DDES methods,and the numerical simulation results are closer to the experiment values.It can be seen that IDDES method has good advantages and engineering practicability.
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