Accelerating Fast Fluid Dynamics with a Coarse-Grid Projection Scheme

Fast fluid dynamics (FFD) is an intermediate model that can provide fast and informative building airflow simulations. To further increase the computing speed of FFD, this study proposed applying the coarse-grid projection (CGP) scheme in FFD, which solves the momentum equation on the fine grid level and the pressure equation on the coarse grid level. Through validating the CGP scheme with building airflows of varying complexities, this study found that it could significantly accelerate simulation speed of FFD while not causing negative impact on the simulation accuracy.