[hellowqy]

Hi, everyone, we know the macro C_VOF can be used to return real variables associated with the VOF multiphase model in SI units. But could you tell me the meaning of F_VOF, I’m now confusing about it. Please help me. Thanks very much.

PS: The following code are taken from the FLUENT HELP FILE, which contains the macro F_VOF.

# include "udf.h"
# define domain_ID 2
DEFINE_ADJUST(adjust_gradient, domain)
{
Thread *t;
cell_t c;
face_t f;
domain = Get_Domain(domain_ID);
/* Fill UDS with the variable. */
thread_loop_c (t,domain)
{
begin_c_loop (c,t)
{
C_UDSI(c,t,0) = C_VOF(c,t);
}
end_c_loop (c,t)
}
thread_loop_f (t,domain)
{
if (THREAD_STORAGE(t,SV_UDS_I(0))!=NULL)
begin_f_loop (f,t)
{
F_UDSI(f,t,0) = F_VOF(f,t);
}
end_f_loop (f,t)
}
}
DEFINE_ON_DEMAND(store_gradient)
{ Domain *domain;
cell_t c;
Thread *t;
domain=Get_Domain(1);
/* Fill the UDM with magnitude of gradient. */
thread_loop_c (t,domain)
{
begin_c_loop (c,t)
{
C_UDMI(c,t,0) = NV_MAG(C_UDSI_G(c,t,0));
}
end_c_loop (c,t)
}
}

[`e`]

Fluent is a finite volume based solver and uses cell-centred values. These values are accessible with the C_* family of macros. However, face values are also required for a number of operations and can be accessed with F_*.

The macros C_VOF and F_VOF correspond to the volume fraction of a cell and of a face, respectively.