Boundary condition
 

Hi,

I am new to openfoam and started going through the tutuorials in openfoam user guide.

In dambreak tutorial, fixedFluxPressure boundary condition is applied for pressure at walls. It is said that this BC adjust pressure gradient based on velocity boundary condition.

I then used this boundary condition to wall pressure in cavity case (instead of using zeroGradient). But then it doesn't work.

Can someone please tell me why I cant use fixedFluxPressure in cavity case?