[billy]

Hi,

I was running icoFoam with lid-drive cvavity and I noticed that pressure changed in same degree, as I refined the mesh. Doubling the cells in xy direction, the pressure doubles also. Documentation says:

"In a closed incompressible system such as the cavity, pressure is relative: it is the pressure range that matters not the absolute values"

But why does the pressure range change? With 10x10 grid pressure range is -20-20, with 20x20 grid it is -40-40, with 40x40 it is -80-80. Shouldn't it converge to a certain range?

Thanks in advance,

Billy.