【作者】 陈懿；

【导师】 樊建人；

【作者基本信息】 浙江大学 ， 工程热物理， 2006， 硕士

【摘要】 本文使用直接数值模拟方法研究了三维气固两相圆柱绕流，迄今为止，使用直接数值模拟方法对气固两相圆柱绕流进行三维的模拟所得到的研究成果还不是很丰富。本文在较为系统的回顾和总结近期圆柱绕流以及气固两相圆柱绕流研究现状的基础上，通过三维的直接数值模拟，对流场入口条件对气固两相圆柱绕流运动的影响进行了开创性的研究，取得了一些具有重要理论意义和实际应用价值的创新性成果。 本文的求解对象是具有不可压缩性质的流场控制方程组，并且采用单相耦合的方法模拟各种典型雷诺数和典型颗粒大小情况下流场流动和颗粒场扩散行为受到流场入口条件的影响。DNS的数值方法基于高精度紧致差分方法。本文采用Lele在1992年的综述中提出的4阶精度的紧致差分格式离散空间导数，同时时间步进采用Jameson提出的低存储量要求的4阶Runge-Kutta格式。边界条件的设置采用Orlanski的无反射边界条件来捕捉瞬态流动中的Karman涡街。数值结果揭示出的和Williamson经典试验相一致的流场流动的A，B模式的出现证明了这种方法是成功的。 本文首先用DNS方法模拟了均匀来流速度进口条件和非均匀来流速度进口条件下三维气固两相圆柱绕流的流场结构和颗粒在流场中的扩散行为。对于两种来流条件，都对两种雷诺数200、180和两种颗粒大小斯托克斯数为1、斯托克斯数为0.01，组合四种情况进行了计算。计算结果得到了圆柱绕流向三维转捩的过程，成功的捕捉到了Karman涡街，观察到了A，B模式的出更多还原

【Abstract】 A computational study of three-dimensional gas-solid two-phase circular cylinder wake has been performed using direct numerical simulation (DNS). Up to now, studies about three-dimensional gas-solid two-phase circular cylinder wake using DNS are considerably few. Based on thoroughly review and summary in the research status of recent circular cylinder wake and gas-solid two-phase circular cylinder wake, by using three-dimensional direct numerical simulation, the thesis initiated the study of the effect on the pattern of the three-dimensional gas-solid two-phase circular cylinder wake caused by the different flow inflow conditions or different particle inflow conditions. It yielded some creative achievements with important theoretical significance and engineering application value.The solving object is a set of governing equations of a flow field featured being uncompressible. And the one way coupling method is also employed to simulate the behavior of the flow and the dispersion of the particle field under the conditions of all sorts of typical Reynolds numbers and Stokes numbers and the effect on them caused by different inflow conditions. The numerical scheme is based on high accurate finite compact difference method. And the fourth-order compact difference schemes suggested by Lele in his review published in 1992 are applied to discretize the space derivatives, and a low-storage four-order Runge-Kutta scheme suggested by Jameson is used in time marching. In the setting of the boundary condition the Orlanski’s Non-reflecting boundary更多还原