Flow field around a ball that doing free fall in a cube
 

r is ball radius, h is box Length, width and height, 2r<h. How to calculate this kind of field. How to set BC. . Any suggestion are helpful. Thx in advance.

nado

Re: Flow field around a ball that doing free fall in a cube
 

I guess it depends on what you want of the analysis.

If its just the steady state flow field around the ball, you can make the system steady and let the flow past a stationary ball.

Re: Flow field around a ball that doing free fall in a cube
 

At each time step, shall i generate a new grid?

Re: Flow field around a ball that doing free fall in a cube
 

If you are doing a steady state analysis there is no need to generate the grid every time.