本文用大涡模拟方法研究了湍流后台阶流场中的大涡演变过程,并在此基础上研究了目前大涡模拟中比较常用的六种亚格子模式.在相同的流动几何参数以及计算条件下,给出了不同亚格子模式下湍流流动瞬时压力场以及流场中瞬时粘性大小的分布,尤其给出了流场瞬时演变的大尺度涡结构.将六种亚格子模式从回流区长度、计算时间、计算结果的准确性和流场稳定性等不同角度进行了比较.为选取合适的亚格子模式深入研究湍流耗散机理奠定了基础.
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