浑水异重流两相流模型的比较研究

运用双流体模型(Euler Model)和相间相对速度建立在代数滑移模型基础上的混合模型(MASM),对水槽浑水异重流进行数值计算。将计算结果和实测值比较,发现Euler Model和MASM模型均能较准确地描述异重流动,但在计算得到异重流头部厚度值时,二者存在差别。依据颗粒运动规律分析,Euler Model过度强调颗粒跟随性,使得颗粒沉降速度偏大,头部厚度值偏小,MASM考虑了界面附近颗粒的扩散,与实际情况更吻合;因此,MASM更适宜浑水异重流的数值模拟。

Comparison of the Two-phase Flow Models for Turbid Density Current

As an especial form of sediment-laden flow,turbid density current can be simulated by two-phase flow models usually including Eulerian multiphase model and mixture model.Because a full Eulerian multiphase model may not be feasible for its complexity,a simplified Eulerian multiphase model,in which the interface force only includes the friction,is applied.Here,the simplified Eulerian multiphase model(i.e.Euler Model) and the mixture model whose relative speed of phases is based on the algebraic slip model(i.e.MASM) were applied to simulate 2-D turbid density current in a channel.It was found that both of them could simulate the current fairly accurately.However,the heights of the heads obtained were different.The following behavior of particles was over stressed in Euler Model while MASM,in which the diffusion of particles was considered,was closer to the actual situation.Therefore,MASM was more suitable for the numerical simulation of turbid density current.