[priya_1985]

hello all,
i m new to c. i m trying to write Udf for surface reaction rate, which is showing parse error in line 34. can any buddy help to correct this.


#include "udf.h"

/* ARRHENIUS CONSTANTS */
#define PRE_EXP 1e+19
#define ACTIVE 2.22e+05
#define BETA 0.0

real arrhenius_rate(real temp)
{
return
PRE_EXP*pow(temp,BETA)*exp(-ACTIVE/(UNIVERSAL_GAS_CONSTANT*temp));
}

/* Species numbers. Must match order in Fluent panel */
#define h2o 0
#define n2 1
#define co 3.5
#define c7h5n3o6 1
#define c 3.5
#define NUM_SPECS 5

/* Reaction Exponents */
#define h2o_EXP 0
#define n2_EXP 0
#define co_EXP 0
#define c7h5n3o6_EXP 1
#define c_EXP 0

#define MW_c7h5n3o6 227.13
#define STOIC_c7h5n3o6 1.0

/* Reaction Rate Routine */

real reaction_rate(cell_t c,Thread *cthread,real mw[],real yi[])
{
real concenc7h5n3o6 = C_R(c,cthread)*(yi[c7h5n3o6]/mw[c7h5n3o6]);
return arrhenius_rate(C_T(c,cthread))*pow(real concenc7h5n3o6,c7h5n3o6_EXP);
}

[bluenail]

First of all,

there is no type of UDF function you upload

real reaction_rate(cell_t c,Thread *cthread,real mw[],real yi[])

UDF function name is like this

Section 2.3.1: DEFINE CHEM STEP
 Section 2.3.2: DEFINE CPHI
 Section 2.3.3: DEFINE DIFFUSIVITY
 Section 2.3.4: DEFINE DOM DIFFUSE REFLECTIVITY
 Section 2.3.5: DEFINE DOM SOURCE
 Section 2.3.6: DEFINE DOM SPECULAR REFLECTIVITY
 Section 2.3.7: DEFINE GRAY BAND ABS COEFF
 Section 2.3.8: DEFINE HEAT FLUX
 Section 2.3.9: DEFINE NET REACTION RATE
 Section 2.3.10: DEFINE NOX RATE
 Section 2.3.11: DEFINE PR RATE
 Section 2.3.12: DEFINE PRANDTL UDFs
 Section 2.3.13: DEFINE PROFILE
 Section 2.3.14: DEFINE PROPERTY UDFs
 Section 2.3.15: DEFINE SCAT PHASE FUNC
 Section 2.3.16: DEFINE SOLAR INTENSITY
 Section 2.3.17: DEFINE SOURCE
 Section 2.3.18: DEFINE SOX RATE
 Section 2.3.19: DEFINE SR RATE
 Section 2.3.20: DEFINE TURB PREMIX SOURCE
 Section 2.3.21: DEFINE TURBULENT VISCOSITY
 Section 2.3.22: DEFINE VR RATE
 Section 2.3.23: DEFINE WALL FUNCTIONS