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UDF + tangential/normal direction

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Old   October 7, 2016, 05:17
Default UDF + tangential/normal direction
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Hi all,

I want to write an UDF function for a velocity boundary condition. I want that the velocity is tangential (or normal... i can later change it!) for a curved face (imagine an airfoil).
My problem is that I don't know how to define the normal vector for each cell... is there such function??? I saw "f_normal" but I don't know how to apply in my "define_profile" UDF function.

As an example, I copy you a simple function for a flat configuration (but I need to put normal or tangential because my shape is curved):

DEFINE_PROFILE(VelX, thread, position)
{
face_t f;
real x[ND_ND];
real vel=49.8733;

begin_f_loop(f, thread)
{
F_CENTROID(x,f,thread);
F_PROFILE(f, thread, position) = vel;
}
end_f_loop(f, thread)
}


Any help is appreciated ;D
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