基于非定常低速预处理和DES的三角翼数值模拟

摘要

This paper develops a 3-D low speed unsteady numerical simulation method based on low speed precondition using spalart-Allmaras-detached-eddg simulation (SA-DES) and shear stress transport DES(SST-DES) models. Hybrid grid finite volume method is used to solve unsteady flow fields. The dual time stepping method based on LU-SGS implicit scheme is used in temporal discretization. The unsteady low speed precondition method is derived and analyzed. Delta wing unsteady flow at high-an-gle-of-attack is simulated by using the present method. Present pressure distributions from different stations agree well with experimental data and reference data.%发展出一套基于低速预处理技术采用SA-DES和SST-DES模型,对三维低速非定常流动进行数值模拟的方法.采用非结构混合网格有限体积方法求解非定常流场,时间离散采用基于LU-SGS隐式格式的双时间步长方法.对非定常低速预处理方法进行了推导和分析,并应用该方法对大攻角三角翼的非定常流场进行了数值模拟,对不同站位压强分布与试验值和参考文献值进行了对比,吻合较好.