Week 3: Flow over a backward facing step

introduction

Flow over a backward-facing step is a common phenomenon in practical engineerings, such as the internal flow in diffuse, turbine, combustion, pipes, and external flow over aircraft.

one representative separation flow model, which is of significance in both theoretical and engineering development

geometry

case setup

meshing

• dx = dy = dz =2e-3 m

dx = dy = dz =1.5e-3 m

dx = dy = dz =1.0e-3 m

results

case 1

velocity

pressure

case2

velocity

pressure

case 3

velocity

pressure

animation link(https://drive.google.com/drive/folders/1fGk16zFI2Km6aO3e7k1d3dcV5Kd2J65p?usp=sharing )

conclusion

as grid size increases time consume run simulation decrease

as the grid size decrease the cell count increase