from UDF(fluent) to OpenFOAM code

fra d'amb · October 22, 2015, 10:00

Hi everybody,
i've to use the following UDF in an OpenFOAM case. I know that OF doesn't use UDF but I don't know how implement the code in OF.
The UDF is used to evaluate the source term of a heat exchange.

Code:

#include "udf.h"
#include "mem.h"

#define TimeCoeff 50.0
#define WGTemp 600.0
DEFINE_SOURCE(sink,c,t,dS,eqn)
{
    real con, source, rho, spheat, temp;
    int tstep;
    tstep = RP_Get_Integer("time-step");
    rho = C_R(c,t);
    spheat = C_CP(c,t);
    temp = C_T(c,t);
        
    if (tstep > 1000)
    {
        source = TimeCoeff*rho*spheat*(WGTemp-temp);
        dS[eqn] = 0.;
    }
    else
    {
        source = dS[eqn] = 0.;        
    }    
return source;
}

Someone can give me some advice or show some example.

Regards

Francesco

hk318i · October 23, 2015, 19:26

Hello Francesc,

In OpenFOAM terms, you can check fvOptions. It allows you to add a source term to the solver governing equations as a part of case setup.

Search here in the forum for fvOptions. Check this [LINK] as an example but I believe it is not the only one.

Best wishes,
Hassan

October 22, 2015, 10:00	from UDF(fluent) to OpenFOAM code	#1
fra d'amb New Member francesco Join Date: Jun 2015 Posts: 3 Rep Power: 10	Hi everybody, i've to use the following UDF in an OpenFOAM case. I know that OF doesn't use UDF but I don't know how implement the code in OF. The UDF is used to evaluate the source term of a heat exchange. Code: #include "udf.h" #include "mem.h" #define TimeCoeff 50.0 #define WGTemp 600.0 DEFINE_SOURCE(sink,c,t,dS,eqn) { real con, source, rho, spheat, temp; int tstep; tstep = RP_Get_Integer("time-step"); rho = C_R(c,t); spheat = C_CP(c,t); temp = C_T(c,t); if (tstep > 1000) { source = TimeCoeffrhospheat*(WGTemp-temp); dS[eqn] = 0.; } else { source = dS[eqn] = 0.; } return source; } Someone can give me some advice or show some example. Regards Francesco

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October 23, 2015, 19:26		#2
hk318i Senior Member Hassan Kassem Join Date: May 2010 Location: Germany Posts: 242 Rep Power: 17	Hello Francesc, In OpenFOAM terms, you can check fvOptions. It allows you to add a source term to the solver governing equations as a part of case setup. Search here in the forum for fvOptions. Check this [LINK] as an example but I believe it is not the only one. Best wishes, Hassan