Numerical simulation of internal flow in a three-dimensional U-bend duct using hybrid RANS-LES method
The complex internal flow in the three-dimensional U-bend duct is numerically investigated based on hybrid RANS-LES method.Three models are adopted,i.e.the IDDES model,the SBES model,and the SBES model employing curvature correction.The experimental and numerical results of axial velocity,frictional drag coefficient,and pressure coefficient are compared in detail,it is found that the SBES model yields more accurate results than the IDDES model,and WALE model characterizes the internal flow of the three-dimensional U-bend duct well compared with the other two sub-grid scale models.Moreover,the curvature correction employed by the SBES model improves the numerical results of axial velocity,fractional drag coefficient and pressure coefficient.
three-dimensional U-bend ductcurvature flowhybrid RANS-LES methodIDDES modelSBES model
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