一种限制周期气固两相流直接数值模拟中整体质量流率的新方法

全周期边界条件的气固两相流系统是研究气固相互作用的一个常用计算模型。为平衡周期气固系统在流向上的受力,常对系统施加平衡系统总重力的固定压力梯度,但由于数值误差的影响,这种固定压力梯度的方法会使得气固系统整体不断加速进而导致模拟失真。为了降低系统质心加速度的影响,本文先后采用了前人提出的固定整体质量流率方法和本文提出的压力梯度后验修正方法,并对两种方法的模拟结果进行了对比。

A New Method for Limiting the Total Volumetric Flux in Direct Numerical Simulation of Periodic Gas-Solid Two-Phase Flows

The domain with full-period boundary conditions is commonly adopted in simulations of gas-solid interactions.To balance the force of periodic gas-solid systems in the flow direction,a fixed pressure gradient is often used to drive the system.Due to the influence of numerical errors,this way usually accelerates the whole system and leads to the failure of the simulation.To reduce the influence of the system’s centroid acceleration,this paper has proposed a new approach called "the pressure gradient posterior correction method".Comparison is made between the simulation results of the new method and the fixed total volumetric flux method proposed by other researchers.