DCD格式在气固两相流计算中的应用

Application of DCD Scheme in Computation of Gas-Solids Two-phase Flow

为将DCD格式推广到两相流动力学计算,通过对气固两相流动力学方程的适当变形,并处理为向量形式,实现了用DCD格式对气相和固相的统一计算,无须数值粘性和人工滤波.分别用DCD格式、Mac Cormack格式、TVD格式对密闭容器内的一维非定常气固两相流动进行了计算.计算结果表明,DCD格式计算精度高,使用方便.DCD格式能用于两相流动力学仿真,是一种很好的激波捕捉格式.

In order to extend DCD scheme to dynamics simulation of gas-solids two-phase flow, the dynamic function of gas-solids two-phase flow was rewritten in new mode and was derived into vector form, therefore the motion of gas and solids can be computed uniformly with DCD scheme. This computation needs no artificial filtering and numerical viscous. One-dimension unsteady flow of gas and solids in a closed vessel was simulated with Mac Cormack scheme, TVD scheme and DCD scheme respectively. Numerical results show that DCD scheme has high computation accuracy, and is easy to use. The DCD scheme can be applied in dynamics simulation of two-phase-flow, which is a good shock-capturing scheme.