Udf help
 

Dear Ajay,

I'm writing a C program for Flapping of a 3D wing. I'm unable to compile it in TURBO C. I' attaching the program along with the errors that r generated. kindly have a look and help me debug it.
# include <math.h>
# include "udf.h"
# include "dynamesh_tools.h"
# define DEFINE_CG_MOTION(wing,dt,vel,omega,time,dtime) {\
double Freq, pi, w, degree, phimax, thmax, phi, dphi, dtheta;\
degree = 20; /*degree step set by journal file*/ \
Freq=1.0/(dtime*degree); /*dtime is the physical time step defined in the journal file*/ \
pi = 3.141592654;\
w=2*pi*Freq; /*Omega (radians)*/\
phimax = 30.0*pi/180; /*flapping amplitude set by journal file*/\
thmax = 30.0*pi/180; /*feathering amplitude set by journal file*/\
phi = -phimax*sin(w*time); /*flapping angle*/\
dphi = -phimax*w*cos(w*time); /*flapping speed*/\
dtheta = thmax*w*sin(w*time); /*feathering speed*/\
vel[0] = 0;\
vel[1] = 0;\
vel[2] = 0;\
omega[0] = dphi;\
omega[1] = dtheta*cos(phi);\
omega[2] = dtheta*sin(phi);\
}


The errors are as follows

Error C:\ TC\ Airfoil 1.c : unable to open include file ' DYNAMESH_TOOLS.H'

Error C:\ TC\ include\udf.h : unexpected end of file in conditional started on line 0

hi ajay,

in your post you have mentioned to make directory for compiled UDF in x86 system. i am using x64 system. how can i make the directory and compile the UDF in x64 system.
whether i have to install visual c++ or visual studio prior.

please help me

thanks and regards,
prishor

Help with the UDF
 

Hi there fellow fluent users.I get an error message when trying to interpret the UDF in Fluent see below

Help with the error in UDF
 

Hi fluent users,
I get an error message when trying to interpret the UDF in Fluent. The following message appears: line 124: parse error. I even tried
c:\fluent.inc\ntbin\ntx86 folder ... as suggested by Ajay.
Also if there is any correction in the UDF it could be suggested


#include "udf.h" /* must be the bginning of every UDF you write */
#include "sg_pb.h"
#include "sg_mphase.h"

DEFINE_PB_Nucleation_Rate(nuc_rate,cell,thread)
{
real J,S;
real Kn=1.0e36; /* Nucleation rate constant */
real Nn=2686.; /* Nucleation law power index */
real T,solute_mass_fract,solvent_mass_frac,solute_mol_f rac,solubility;
real solute_mol_wt, solvent_mol_wt;

Thread *tc=THREAD_SUPER_THREAD(thread); /* obtain mixture thread */
Thread **pt=THREAD_SUB_THREADS(tc); /* pointer to sub_threads thread */
Thread **tp=pt[P_PHASE]; /* primary phase thread */


solute_mol_wt=224.00; /* molecular weight of barium sulphate */
solvent_mol_wt=18.; /* molecular weight of water */
solute_mass_frac=C_YI(cell,tp,o); /* mass fraction of solute in primary phase (solvent)*/
solvent_mass_frac=1.0-solute_mass_frac;
solute_mass_frac=(solute_mass_frac/solute_mol_wt)/
((solute_mass_frac/solute_mol_wt)+(solvent_mass_frac/solvent_mol_wt));

T=C_T(cell,tp); /* Temperature of primary phase in kelvin */
solubility=0.0005*T-0.0794; /* Solubility Law relating equilibrium solute mole fraction to Temperature */

s=solute_mol_frac/solubilty; /* Definition of Supersaturation */
if (S=1.)
{
J=0.;
}
else
{
J=Kn*exp-((Nn)/(pow((lnS),2.0)));
}
return J;
}

the equation is J=Kn exp (-Nn/(lnS)^2)

Hi guys any help or guidance will be appreciated

Hi, ashar

Did you solve this error??

If you are, can you explain how to solve the error??