非结构网格在周期性充分发展流动数值模拟中的应用

为了解决周期性充分发展流动数值模拟的计算复杂性，该文提出了非结构网格上周期性边界进出口条件相互回代的方法。应用此方法对横掠叉排管束周期性充分发展层流流动进行了数值模拟，并将其结果与流动进口内8个管束层流流动的充分发展区域的数值模拟结果进行了比较，得到了较一致的结果。实验表明：单周期上进出口条件相互回代的方法可以替代多周期的数值计算，从而简化了计算过程，节省了计算时间。

Application of Unstructuted Grids in Numerical Simulation of Periodic Flow

In order to reduce the complexity of the whole periodic numerical simulation in periodically repeating geometrices, a new replacement method of periodic boundary conditions on unstructured grids is advanced. The method computes the fluid flow in periodically repeating geometries in order to decrease the complexity of the whole periodic numerical simulation. The periodic fluid flow outside the tube bundles is studied numerically using the laminar model and the result accords with the numerical benchmark. The experiment shows that the new method can substitute for the numerical benchmark with the benefit of predigesting the process and saving the time of the computing.