[sven]

Hi everyone,

I am trying to simulate a simple 2D-Channel Flow with the icoFoam solver. Unfortunatelly I do not reach a steady solution after more than 150 seconds. Strange things are happening at the In- and Outflow (I get some kind of detachment/displacement at the outflow). I think these troubles are caused by the BCs. So, I wanted to change my Outlet BC to "calculated". I tried it like this:

Outlet
{
type calculated;
}

for the U file in the folder 0. But if I want to solve this I always get an error saying:

gradientInternalCoeffs cannot be called for a calculatedFvPatchField
on patch Outlet of field U in file "/home/sven/OpenFOAM/sven-1.5/run/Case1-laminarChannelFlow/Subcase1/0/U"
You are probably trying to solve for a field with a default boundary condition.

From function calculatedFvPatchField<Type>::gradientInternalCoef fs() const
in file fields/fvPatchFields/basic/calculated/calculatedFvPatchField.C at line 187.

Does somebody know what the problem is? Tanks.