- **FLUENT**
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- - **F_CENTROID
**
(*https://www.cfd-online.com/Forums/fluent/32821-f_centroid.html*)

F_CENTROID
I was looking at the following simple code for a UDF.
F_CENTROID(x,f,thread); y = x[1]; F_PROFILE(f, thread, nv) = 20.*(1.- y*y/(.0745*.0745)); x is the position vector defined as: float x[3]; /* this will hold the position vector*/ Question: wouldn't y=x[1] 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[2] |

Re: F_CENTROID
No, in C all arrays starst from the 0 position. So you'll have x[0], x[1] and x[2], which contains, in the order, x, y, and z.
P.S. Better to define x as: real x[ND_ND]; 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. Hi :) ap |

x{nd-nd}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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