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Source term for Momentum giving segementation fault

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Old   June 27, 2017, 06:56
Unhappy Source term for Momentum giving segementation fault
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sebastian bergman
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In my momentum equation owing to density difference i have to write a source term udf. the source term is,

source term= - ρl.(1+∝).u ⃗ .∂fl/∂t

where ∝ = the volume of fraction variable
fl = liquid fraction
ul = Velocity vector
ρl and ρs = liquid and solid density respectively


I did write a udf for it

-----for x-momentum----
#include "udf.h"
#define rho_l 1544.0
#define rho_s 1648.0

DEFINE_SOURCE(x_momentum_source,c,t,dS,eqn)
{
real source;
source = -(rho_l*(1+C_VOF(c,t))*C_U(c,t)*((C_LIQF(c,t)-C_LIQF_M1(c,t))/CURRENT_TIMESTEP));
dS[eqn] = 0;
return source;
}

----for y-momentum-----
#include "udf.h"
#define rho_l 1544.0
#define rho_s 1648.0

DEFINE_SOURCE(y_momentum_source,c,t,dS,eqn)
{
real source;
source = -(rho_l*(1+C_VOF(c,t))*C_V(c,t)*((C_LIQF(c,t)-C_LIQF_M1(c,t))/CURRENT_TIMESTEP));
dS[eqn] = 0;
return source;
}


i hooked it in the cell zone section. i was using the VOF module.
IT is giving me a segmentation fault.
I am not able to understand the mistake here. can anybody help?
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