热对流条件下双颗粒沉降的直接数值模拟

Direct numerical simulation of the sedimentation of two particles with thermal convection

在任意拉格朗日-欧拉(ALE)算法模拟等温惰性颗粒两相流的基础上,增加对能量方程的联立求解,对热对流条件下双颗粒的沉降进行了直接数值模拟.结果表明:双颗粒在等温流体、热流体和冷流体中运动形式是不同的,造成不同的主要因素是热对流引起了颗粒不同的动态尾迹,在热流体中颗粒尾部形成了涡的脱落,在冷流体中颗粒尾部形成了羽流.

Based on the study of isothermal inert particle sedimentation, the Arbitrary Lag rangian-Eulerian technique was used to solve the problem of sedimentation of two solid particles with thermal convection, including the energy equation. The results show that because of the dynamic wake caused by thermal convection, the trajectory of particles are distinct from each other when settling in isothermal, cool and hot fluid; there is vortex shedding in hot fluid, while in cool fluid a strong upward thermal plume forms.