利用非结构化网格上的有限体积法对三维湍流进行了数值研究，提出了不用求解单元顶点处变量值的二阶混合差分格式，既避免了复杂耗时的单元顶点处变量值的计算，又避免了普通差分格式在非结构化网格上易于引起网格界面方向相关性问题。最后利用非结构化网格计算程序，数值求解了一台离心风机内叶轮及无叶扩压器通道内三维相对定常湍流，计算结果与实验值的比较表明速度的计算值与实验值吻合较好。
Three-dimensional turbulent flows are numerically investigated using finite volume method on unstructured grid. A two-order hybrid differential scheme is proposed in which the dependent variables values at grid vertices are not required to compute. The complex and time-consuming computations on grid vertices and grid dependency problem, which may easily rise from some ordinary differential schemes, can be avoided. Finally the proposed unstructured grid method is used to compute the relatively steady turbulent flows in a centrifugal backswept fan impeller and vaneless diffuser. Comparison between the computations and experimentation shows that the agreements are overall good.
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