[clktp]

I have a geometry and I wanna obtain pressure on its surfaces for flow directions. Well you can think like different attack angles, it is not an airfoil though. The problem is I wanna use the same grid without generating grid every time but I have no idea how to do if it is possible of course.

Can I use a interface or something else to do it? I was wondering maybe there is a way to do it in a similar way to rotating axis approach. In my case nothings rotates obviously.

[tomf]

Hi,

You can, it can be done either using a circular domain or using a rectangular domain. We typically use a circular domain for wind studies with multiple directions and then use groovyBC to set an atmospheric boundary layer outlet/inlet boundary condition where the behavior of the domain boundary condition depends on the angle specified in the groovyBC variables.

Something like this:

    Domain
    {
        type            groovyBC;
        value           $internalField;
        valueExpression "vector(sin(alpha*pi/180),cos(alpha*pi/180),0)*Uvalue";
        gradientExpression "vector(0,0,0)";
        fractionExpression "(phi > 0 ) ? 0 : 1";
        variables       "Uvalue=5;alpha=74.50;";
    }

Best regards,
Tom