摘要
现有的计算流体力学方法在计算非定常流场时往往需要耗费相当多的时间。为了缩短计算时间,提出一种新的分区计算方法。该方法基于速度—涡形式的N-S方程,将整个流场计算域分为势流域、边界层域和N-S方程域3个部分。由于势流域不存在涡量,所以不需要进行涡量输运方程求解。而在边界层域,涡量输运方程则简化成了计算量更小的边界层方程。用该方法计算了俯仰震荡翼型的流场,雷诺数为1×106。通过与商业软件的比较发现,该方法能够节省近三分之一的计算时间。进一步的,对俯仰震荡翼型在高频下独有的脱涡模式和非定常受力进行了细致的分析。
Considerable computational time is often required in the existing computational fluid dynamics methods for the calculation of a unsteady flow field.In order to decrease the computation time,a new zoning calculation method is proposed.Based on the velocity-vorticity N-S equation,the whole flow field is divided into three parts：the potential domain,the boundary layer domain and the N-S equation domain.Since there is no vorticity in the potential domain,it is no need to solve the vorticity transport equation.In the boundary layer,the vorticity transport equation is reduced to boundary layer equation which is easy to solve.The flow field of a pitching airfoil is calculated by this method.Compared with the commercial software Fluent,it is found that the method can save nearly one third of the calculation time.Furthermore,a detailed analysis of the vortex pattern and unsteady force unique to the pitching airfoil at high frequencies is carried out.
出处
《微型电脑应用》
2018年第2期1-3,共3页
Microcomputer Applications
基金
国家自然科学基金(11372178)
关键词
非定常流场
分区计算
震荡翼型
Unsteady flow field Zoning calculation Pitching airfoil
