|
[Sponsors] |
![]() |
![]() |
#1 |
New Member
Join Date: Apr 2011
Posts: 29
Rep Power: 15 ![]() |
Hello,
I am simulating a wall by momentum equations in Cell Zone Conditions. The flow is stationary. I have the force given by equation like: F=c*uxn Where: F - force vector c - constant u - velocity vector n - wall normal vector Force generally is F=momentum/time derivative. So, my question is, how to provide time in UDF in steady/stationary flow? For example for X direction of flow I would have something like: Lx=c*ux*nx and I have to convert the force into momentum, so I would need to derive by time: Lx/dt=Mx=c*ux*nx/dt Code:
#include "udf.h" DEFINE_SOURCE(name,c,t,dS,eqn) { real c, x_vel, L, source, n; c=5; x_vel=C_U(c,t); u=x_vel; n=2; L=c*u*n; source=L/dt; return source; } Code:
source=L/dt; Thank you for help! |
|
![]() |
![]() |
![]() |
|
|
![]() |
||||
Thread | Thread Starter | Forum | Replies | Last Post |
Momentum Equation used in Fluent for porous media | Sherry | FLUENT | 1 | September 12, 2016 10:22 |
Force in UDF | J14 | Fluent UDF and Scheme Programming | 15 | May 12, 2015 08:20 |
Calculation of the Governing Equations | Mihail | CFX | 7 | September 7, 2014 06:27 |
UDF force on a face | enry | Fluent UDF and Scheme Programming | 10 | March 23, 2011 10:48 |
Coupling between momentum and energy equation | Mattia | FLUENT | 0 | October 26, 2007 08:02 |