【摘要】 为适应于模拟超声速流场中的一些特殊物理现象,研究了不同物理现象对边界处理的要求。针对激波、旋涡和声波等流场中典型的流动现象,采用常用的外推、特征和缓冲三类边界处理方法分别进行数值模拟。计算结果表明超声速流场边界采用外推技术,只适于计算带有激波的边界。特征方法还能适于旋涡运动的计算。声波的计算只能采用缓冲层技术。更多还原

【Abstract】 Procedures to define boundary condition used for direct simulation of some specific physical phenomena are discussed.The Three kinds of boundary condition treatments are compared.These methods based on extrapolation,characteristic wave and buffer layer apply to specific flows,respectively.Results are given for several fluid dynamics test problems: the shock-boundary layer interaction,vortices or sonic waves propagating through boundaries.It shown the extrapolation method used for the case with shock waves and expansive waves,merely.Characterize wave method is suitable for about the case and the case with vortices propagating through boundaries,But not suitable for sonic waves propagating through boundaries.The buffer layer method is suitable for all cases about.更多还原