Ansys Employee


The density value is set to assist at the domain outer flow boundaries. If rho_operating – rho_outside is zero you can set the pressure boundary as 0 Pa. If you don’t get a zero difference you need to account for boundary height against the difference so pressure becomes a profile and varies with height. 

For a couple of metres the pressure variation on the boundary isn’t much, but in natural convection flows the driving pressure for the flow is also very small. 

Hopefully  will explain more clearly. The search tool was upgraded overnight, so we can look everywhere rather than just in the Forum.