I was looking at the following simple code for a UDF.
F_CENTROID(x,f,thread); y = x; F_PROFILE(f, thread, nv) = 20.*(1.- y*y/(.0745*.0745));
x is the position vector defined as: float x; /* this will hold the position vector*/
Question: wouldn't y=x assignment pick up the x coordinate of the face centroid? the original formula for the velocity is
u(y) = 20 [ 1 - (y/0.0745)^2]
So I was wondering if we need to write y=x
No, in C all arrays starst from the 0 position. So you'll have x, x and x, which contains, in the order, x, y, and z.
P.S. Better to define x as:
because FLUENT manages real type as a float or double according to the chosen solver.
ND_ND allows to keep the code more general because ND_ND = 2 for a 2D case and ND_ND = 3 for a 3D case.
please can you tell me how will the code for 3d parabolic inlet will be modified.
i have cubical section. with circular inlet of 0.1 radius on one face.
should i use x[ND_ND] & take y=x(2) as variaion will be in both directions y,z. it should be paraboloid.? please give some idea
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