I need to make a UDF containing follow source term:
Q = A(C) / (1 - C) * dC/dz,
where C is volume fraction of granular admixture (e.g., sand or clay) and A is some nonlinear function. Is there any way to describe the dC/dz in user-defined source function in ANSYS Fluent?
Here is an example how to do this.
Domain *pD;
Alloc_Storage_Vars (pD,SV_VOF_RG,SV_VOF_G,SV_NULL);
Scalar_Reconstruction(pD,SV_VOF,-1,SV_VOF_RG, NULL);
Scalar_Derivatives (pD,SV_VOF,-1,SV_VOF_G,SV_VOF_RG,Vof_Deriv_Accumulate);
C_UDMI(c,t,1) = C_VOF_G(c,s_t)[0];
C_UDMI(c,t,2) = C_VOF_G(c,s_t)[1];
Thank you, I wiil try.
I have found some examples of using C_VOF_G, but they have a problems with initial memory allocation for that macros (as I understand).
Thank you, it is working now. The code includes adjust-udf:
DEFINE_ADJUST(store_gradient, domain)
{
Thread *t;
Thread **pt;
cell_t c;
Domain *pDomain = DOMAIN_SUB_DOMAIN(domain,P_PHASE);
Alloc_Storage_Vars(pDomain,SV_VOF_RG,SV_VOF_G,SV_NULL);
Scalar_Reconstruction(pDomain, SV_VOF,-1,SV_VOF_RG,NULL);
Scalar_Derivatives(pDomain,SV_VOF,-1,SV_VOF_G,SV_VOF_RG,Vof_Deriv_Accumulate);
mp_thread_loop_c (t,domain,pt)
if (FLUID_THREAD_P(t))
{
Thread *ppt = pt[P_PHASE];
begin_c_loop (c,t)
{
C_UDMI(c,t,0) = C_VOF_G(c,ppt)[0];
C_UDMI(c,t,1) = C_VOF_G(c,ppt)[1];
}
end_c_loop (c,t)
}
Free_Storage_Vars(pDomain,SV_VOF_RG,SV_VOF_G,SV_NULL);
}
and UDMI are used in the source function. The UDF should be compiled only.
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