为了加深对复杂流动混合现象的认识，为化工设备设计提供理论基础，用大涡模拟方法对可压缩气体混合层进行了三维数值模拟。

To offer a theoretical foundation for chemical equipment design, three-dimensional numerical simulations are made for compressible turbulent mixing shear layer based on large eddy simulation(LES).

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阐述了二维弱可压缩流体流动控制方程和大涡模拟湍流模型。

The weakly compressible fluid control equations and the large eddy simulation turbulence model are expounded.

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在将大涡模拟(LES)应用到工程实际时，面临着两个主要难点：LES对格式要求高和计算量大。

On applying large eddy simulation (LES) to practical interest, the main difficulties were high requirement of numerical schemes and huge computational cost.

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