Simulation of Lid Cavity Flow Using Quasi-Molecular Modelling

We have developed a new method based on quasi-molecular modelling to simulate cavity flow. Each quasi-molecule is defined as a group of particles that interact in a fashion entirely analogous to classical Newtonian molecular interactions. When a cavity flow was simulated, the instantaneous velocity vector fields were obtained by using an inverse distance weighted interpolation method. The velocity vector fields showed the development of a primary vortex and the motion of its core from the upper right to a more central location. The results were in a good agreement with previous studies. A secondary vortex occurred at the lower right corner; however, the secondary vortex was generally difficult to locate. The velocity distributions obey the Maxwellian distribution and the configurationally internal energy fluctuated around stable average values when the systems were at equilibrium.