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-   -   UDF for sloshing (https://www.cfd-online.com/Forums/fluent/50786-udf-sloshing.html)

 Alamedda March 6, 2009 11:35

UDF for sloshing

Hi every one ,

I'm modeling a sloshing of a rectangular tank on FLUENT 6.3 and I kind of need some help for the UDF defining it.

I want to simulate the sloshing from A to Z and and I'm facing problems in defining the source terms, the unsteady iteration, and what equations i need to activate.

on the experimental side, My tank is doing sinusoidal movements (right/left and up/down).

My biggest problem is the UDF. Mine is the following :

#include "udf.h" #include "stdio.h"

double x[ND_ND]; double PI=3.14159; real thetamax = (4*3.14159*2)/360; real frequence = 0.50 ; real phi=0;

DEFINE_SOURCE(xmom_source, c, t, dS, eqn)

{

real temps;

real omega, deromega;

real source_x;

temps = CURRENT_TIME;

C_CENTROID (x, c, t);

omega = thetamax*sin(temps*(2*PI)*frequence + phi);

deromega = thetamax*(frequence*(2*PI))*cos(temps*frequence*(2 *PI) + phi);

source_x = C_R(c,t)*(-9.8*sin(omega*temps)-x[1]*deromega-C_V(c,t)*omega-2*pow(omega, 2)*(x[0]-0.2));

dS[eqn] = 0;

return source_x;

}

DEFINE_SOURCE(ymom_source, c, t, dS, eqn)

{

real temps; real omega, deromega; real source_y;

temps = CURRENT_TIME;

C_CENTROID (x, c, t);

omega = thetamax*sin(temps*(2*PI)*frequence + phi);

deromega = thetamax*(frequence*(2*PI))*cos(temps*frequence*(2 *PI) + phi);

source_y = C_R(c,t)*(-9.8*cos(omega*temps)+(x[0]-0.2)*deromega+C_U(c,t)*omega-2*pow(omega, 2)*x[1]);

dS[eqn] = 0;

return source_y;

}

Thank you for responding.

 puneetnema November 13, 2013 02:29

hii

hii,did u get solution for ur problem,
i also need help regarding same and i m also not able to create udf
plz help me

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