I need to initialize a multiphase VOF model for a FSI, 2-way simulation. When I initialize it normally using the fluent GUI, the initialization state is not saved and passed into system coupling so I get a ton of errors. I'm looking into UDFs to initialize the fluid domain automatically at the start of the solution process so that I don't run into these errors. The problem is that I'm getting a parse error in my UDF; I'm not a C expert. I've found this UDF from the documentation that I'm trying to modify:
https://www.sharcnet.ca/Software/Fluent6/html/udf/node98.htm
I want to modify this UDF to patch the VOF in a rectangular region, NOT a spherical region. This is what I have:
/*****************************************************************
UDF for initializing phase volume fraction
******************************************************************/
#include "udf.h"
/* domain pointer that is passed by INIT function is mixture domain */
DEFINE_INIT(patch_vof, mixture_domain)
{
int phase_domain_index;
cell_t cell;
Thread *cell_thread;
Domain *subdomain;
real xc[ND_ND];
/* loop over all subdomains (phases) in the superdomain (mixture) */
sub_domain_loop(subdomain, mixture_domain, phase_domain_index)
{
/* loop if secondary phase */
if (DOMAIN_ID(subdomain) == 3)
/* loop over all cell threads in the secondary phase domain */
thread_loop_c (cell_thread,subdomain)
{
/* loop over all cells in secondary phase cell threads */
begin_c_loop_all (cell,cell_thread)
{
C_CENTROID(xc,cell,cell_thread);
if -0.35
Dear , you may find useful information in links below:
https://www.cfd-online.com/...udf/201210-udf-parse-error-initializing-vof-multiphase...
https://www.cfd-online.com/Forums/fluent-udf/
https://studentcommunity.ansys.com/thread/error-while-using-udf-in-parallel-fluent/
Mosab, thank you for your reply.
I was able to figure out a solution to the problem simply by changing the following line:
if -0.35
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