SIMULATION OF LID DRIVEN CAVITY FLOW AT DIFFERENT ASPECT RATIOS USING SINGLE RELAXATION TIME LATTICE BOLTZMANN METHOD

摘要: In this paper, the single relaxation time (SRT) lattice Boltzmann equation was used to simulate lid driven cavity flow at different Reynolds numbers (100-5000) and three aspect ratios, K=1, 1.5 4. Due restrictions on choice of in models, simulation flows is generally limited base method imposing a proper boundary condition will improve capability stability method. work, bounce back rule imposed consider no-slip solid walls constant inlet velocity proposed by Hou applied side cavity. For square cavity, results show that with increasing number, bottom corner vortices grow but they won’t merge together. Also merger into primary vortex creation other secondary shown cases which ratios are bigger than one. case ratio equals four, number reaches over 1000, simulations predicted four vortices, were not previous SRT models. The confirmed MRT model.