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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。
A set of methods based on low-speed pretreatment technique using SA-DES and SST-DES models is developed to simulate low-velocity three-dimensional unsteady flow. The unstructured mixed grid finite volume method is used to solve the unsteady flow field. The time-discrete method is based on LU-SGS implicit scheme. The unsteady low speed pretreatment method is deduced and analyzed. The unsteady flow field of the aerogels at large attack angle is numerically simulated. The pressure distributions at different stations are compared with the experimental and reference values. Good agreement.