方形通道内流体流动的耗散粒子动力学并行计算

利用耗散粒子动力学(DPD)对方形通道内流体流动进行了模拟.通道壁面由3层粒子组成.在壁面附近实施了无滑移边界条件,在流动方向实施了周期性边界条件.计算中对每一颗粒子施加重力,从而驱动整个流体流动.计算结果表明,流体充分发展的速度分布与基于N-S方程的数值模拟结果一致.并行计算结果表明,DPD很适合于并行计算.与每个节点所处理的总的粒子数目相比,只有少数粒子参与通信,因此能够获得较高的并行效率.当节点数目为18时,并行效率仍然在80%以上.

The Simulation of Fluid Flow through a Square Channel with Parallel Implementation of Dissipative Particle Dynamics

The fluid flow in a square channel was investigated using dissipative particle dynamics(DPD).The channel's walls are made up of three layers of DPD particles with no-slip boundary condition imposed on it.Periodic boundary condition is implemented in the x direction.A gravity force is applied to each fluid particle in order to drive the flow.The DPD computational results show that the fully developed velocity profile in a square channel is in good agreement with that of numerical simulation based on N-S equations.(The parallel) computation message passing interface(MPI) technology was implemented in the computation process,and it shows that DPD is suitable to implement parallel computation.The number of particles that are associated to the communication overhead is small compared with the number of total particle simulated in each node,hence higher parallel efficiency could be achieved.The parallel efficiency can be maintained over 80% when the number of nodes is not bigger than 18.