[ghobold]

Hello,

I am trying to make an UDF to obtain specific heat as a function of temperature and other state variable (either pressure or density, hopefully). The problem is that the default macro for specific heat DEFINE_SPECIFIC_HEAT passes only temperature as a state variable and does not inform on the cell or thread. This is what I have tried to do in order to obtain the pressure in the cell:

#include "udf.h"

const char* FLUID = "CarbonDioxide";
const real gauge = 101325; //operating pressure in pascal (as defined in fluent)

double Props (char*, char, double, char, double, char*);

/* other macros here */

DEFINE_SPECIFIC_HEAT(cell_specificHeat, temperature, Tref, enthalpy, yi)
{	 
	real pressure;
	 
	 Domain *domain = Get_Domain(1);
	 Thread *t;
	 cell_t c;
	 thread_loop_c(t, domain)
	 {
	 	begin_c_loop(c, t)
	 	{
	 		pressure = C_P(c, t);
	 	}end_c_loop(c, t)
	 }
	
	real specificHeat;
	
	specificHeat = Props((char*)"C",'T', temperature, 'P', pressure, (char*)FLUID)*1000;
	*enthalpy = specificHeat*(temperature-Tref);
	return specificHeat;
}

Props(), in this case, is a function from a loaded library Coolprop (Coolprop works fine with Fluent, by the way, I'm using it to obtain other real gas properties and it works just fine). Whenever I initialize a solution using the code above, the following error pops up:

/home/ansys_inc/v145/fluent/fluent14.5.7/lnamd64/2ddp_node/fluent_mpi.14.5.7: symbol lookup error: libudf/lnamd64/2ddp_node/libudf.so: undefined symbol: _Z10Get_Domaini
/home/ansys_inc/v145/fluent/fluent14.5.7/lnamd64/2ddp_node/fluent_mpi.14.5.7: symbol lookup error: libudf/lnamd64/2ddp_node/libudf.so: undefined symbol: _Z10Get_Domaini
/home/ansys_inc/v145/fluent/fluent14.5.7/lnamd64/2ddp_node/fluent_mpi.14.5.7: symbol lookup error: libudf/lnamd64/2ddp_node/libudf.so: undefined symbol: _Z10Get_Domaini
/home/ansys_inc/v145/fluent/fluent14.5.7/lnamd64/2ddp_node/fluent_mpi.14.5.7: symbol lookup error: libudf/lnamd64/2ddp_node/libudf.so: undefined symbol: _Z10Get_Domaini
/home/ansys_inc/v145/fluent/fluent14.5.7/lnamd64/2ddp_node/fluent_mpi.14.5.7: symbol lookup error: libudf/lnamd64/2ddp_node/libudf.so: undefined symbol: _Z10Get_Domaini
/home/ansys_inc/v145/fluent/fluent14.5.7/lnamd64/2ddp_node/fluent_mpi.14.5.7: symbol lookup error: libudf/lnamd64/2ddp_node/libudf.so: undefined symbol: _Z10Get_Domaini
MPI Application rank 1 exited before MPI_Finalize() with status 127

999999 (../../src/mpsystem.c@1172): mpt_read: failed: errno = 104

999999: mpt_read: error: read failed trying to read 4 bytes: Connection reset by peer
 The fluent process could not be started.

It seems like the UDF does not recognize the function Get_Domain() and is trying to look for it in the compiled Coolprop library instead of the default Fluent library. Am I doing something wrong or is there another (and hopefully faster, computational time wise) way to do this?

I'm running Fluent 14.5.7 on Fedora 19, in case that's relevant.