[alimea]

Hi

I want to create a special BC (boundary condition) in a patch of a cavity. So I used "groovyBC" in such a way:

movingWal
{
type              groovyBC;
variables       "teta=atan(pos().y/pos().x);r=pow((pow(pos().x,2)+pow(pos().y,2)),0.5)";
valueExpression     vector(-sin(teta), cos(teta), 0)*pow(teta,2);
value     uniform (0,0,0);
conditions      "r<1.008";

but it gives me this error:


continuity error cannot be removed by adjusting the outflow.

Do you know what the reason?

[fumiya]

I'm afraid you have fixed the velocity on every boundary, so the conservation of volume is not able to be met.
You might want to check the balance between the flow in and out of the computational domain through the boundaries.