|
[Sponsors] |
September 18, 2012, 13:17 |
3D model velocity profile
|
#1 |
New Member
rayolau
Join Date: Aug 2012
Posts: 23
Rep Power: 13 |
Hi!
I am simulating the air flow over desert surface. I need to define a parabolic function of the wind in the inlet domain. My model is 3D. The function I have to define is: u (z) = u * / k ln (z / zo), where u = average wind speed (m / s), u * = friction velocity (m / s); k = von Karman constant = 0.4, z = height above the surface (m) = zo = 0.00008 surface roughness. I want to define a maximum speed in function, for example, 6 m/s. I need help with the UDF, I read the ANSYS FLUENT UDF Manual and exemples in this forum and I think that the macro is the following: DEFINE_PROFILE(inlet_x_velocity, thread, position) { real x[ND_ND]; real y; // Vertical Distance face_t f; begin_f_loop(f, thread) { F_CENTROID(x,f,thread); y = x[2]; F_PROFILE(f, thread, position) = (I need help here) } end_f_loop(f, thread) } Thanks for your help! |
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
UDF inlet velocity profile mismatch with Fluent | ChristineL | Fluent UDF and Scheme Programming | 15 | November 25, 2016 06:45 |
Shear stress from velocity profile | baranii2000 | COMSOL | 4 | November 11, 2015 04:08 |
velocity profile inlet boundary condition question | Lcw | FLUENT | 3 | August 3, 2012 05:53 |
Export & Import Velocity profile as Inlet | eRzBeNgEl | STAR-CCM+ | 6 | March 26, 2012 05:16 |
Initial pressure and transverse velocity fields to initialize turbulence model | nickvinn | Main CFD Forum | 0 | February 29, 2012 10:11 |