DPWⅢ机翼和翼身组合体构型数值模拟

Numerical simulation of DPW Ⅲ wing and wing-body configurations

采用"亚跨超CFD软件平台("TRIP)数值模拟了DPW Ⅲ提供的DPW_W1/W2两种机翼构型和DPW-F6/F6_FX2B两种翼身组合体构型,主要目的是通过两种机翼构型和两种翼身组合体构型的数值模拟,研究网格密度对运输机构型气动特性计算结果的影响。数值模拟采用的多块对接网格来自AIAA CFD Drag Prediction Workshop Ⅲ(DPW Ⅲ),采用National Transonic Facility(NTF)的试验结果和CFL3D的计算结果作对比。详细研究了网格密度对两种机翼构型和翼身组合体的总体气动特性和压力分布的影响。采用SST两方程模型计算两种构型均得到了网格收敛结果,网格密度主要影响压差阻力而对摩擦阻力影响较小,计算结果较好地预测了机翼和翼身组合体外形优化前后总体气动特性的变化量。

Numerical simulations on multi-block structured grids are performed to compute drag for the DPW Ⅲ wing and wing-body configurations with Navier-Stokes solver TRIP.The structured grids and reference numerical results are from drag prediction workshop Ⅲ.The effects of mesh density to aerodynamic characters and pressure distribution are carefully studied in present paper.The present results are verified by comparison with CFL 3D results and test results from National Transonic Facility（NTF）.Grid refinement leads to convergence numerical results with Menter＇s SST two-equation turbulent models,grid refinement has larger influence to pressure drag than to friction drag.Pressure distribution of TRIP with hundreds of grids is in good agreement with the results of CFL 3D with far more dense grids.It is demonstrated that the TRIP solver is capable of predicting the small change of aerodynamic characters due to simple optimization of wing and wing-body configurations.