tangent vectors in directionMixed
I am using directionMixed BC and want to know the within used tangent vectors.
To precise my question:
Let's split v into the face normal component and into two tangential components like
v = v_n *n + v_t1 * t1 + v_t2 *t2
When I am using directionMixed like this:
refValue uniform (0 0 1);
refGradient uniform (2 3 0);
valueFraction uniform (0 0 0 0 0 1);
I have set the boundary conditions (hopefully) like:
To get the face normal vector n I am using:
How can I get the tangential vectors t1 and t2 ?
Maybe someone has an useful hint,
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