Abstract
The proper prediction of the wind pressure acting on building walls by LES requires high grid resolution near the walls and the difference schemes with low discretization error, which generally tends to be numerically unstable. For CFD simulations, recently, one of the widely used software is OpenFOAM. OpenFOAM has a specification that the static pressure at the outflow boundary of the computational domain must be a constant value. Our previous studies have confirmed that this specification causes excessive static pressure fluctuations that do not occur in real phenomena when the turbulent velocity fluctuations with fluctuating flow rate are imposed as the inflow boundary conditions. Based on the above, first, this study attempted to stabilize the fluctuating inflow rate. Then, the influence of the grid resolution and the difference scheme of the advection terms on the computational stability and accuracy was investigated for the LES computations of wind pressure acting on a cubic model. The above investigation provided useful information for setting computational conditions when using LES to predict the wind pressure acting on building walls with sufficient numerical stability and accuracy.
