error: uninitialized local variable 't' used

MASOUD · September 22, 2010, 00:19

Hi,
I get the following error:

warning C4700: uninitialized local variable 't' used
warning C4700: uninitialized local variable 'c' used

When I compile the UDF (for line 65)

What could be the reason?

Here is the code:

***************************

#include "udf.h"
#include "sg.h"

/* Define which user-defined scalars to use. */
enum
{
E_CHARGE_UDS,
C_CHARGE_UDS,
N_REQUIRED_UDS
};

static real ACT_AREA_A=270;
static real ACT_AREA_C=300;
static real REF_EXCH_CURR_A=2.1;
static real REF_EXCH_CURR_C=0.40;
static real REV_POT=1.02;
static real MW_H2=0.032;
static real MW_H2O=0.032;
static real MW_O2=0.032;
static real MW_CO2=0.044;
static real MW_N2=0.032;
static real MW_MIX;
static real X_H2;
static real X_H2O;
static real X_O2;
static real X_CO2;
static real X_N2;
static real ALPHA_A=1.5;
static real ALPHA_C=0.5;
static real NO_ELEC=2;
static real FARADAY=96485;
static real UNI_GAS_CONS=8.314;
static real STOCH_H2=-1;
static real STOCH_H2O=1;
static real STOCH_O2=-0.5;
static real STOCH_CO2_A=1;
static real STOCH_CO2_C=-1;
static real RXN_RATE_A;
static real RXN_RATE_C;
static real Z_A;
static real ZZ_A;
static real ZZZ_A;
static real Z_C;
static real ZZ_C;
static real ZZZ_C;
static real source;
static real u=0.0;
static real domain_ID=30;

DEFINE_ADJUST(SUR,d)
{
u+=0.001;
}

DEFINE_ADJUST(UDM,d)
{
Thread *t;
cell_t c;

MW_MIX=MW_H2*C_YI(c,t,0)+MW_O2*C_YI(c,t,1)+MW_CO2* C_YI(c,t,2)+MW_H2O*C_YI(c,t,3)+MW_N2*C_YI(c,t,4);
X_H2=C_YI(c,t,0)*MW_H2/MW_MIX;
X_O2=C_YI(c,t,1)*MW_O2/MW_MIX;
X_CO2=C_YI(c,t,2)*MW_CO2/MW_MIX;
X_H2O=C_YI(c,t,3)*MW_H2O/MW_MIX;
X_N2=C_YI(c,t,4)*MW_N2/MW_MIX;

Z_A=ACT_AREA_A*REF_EXCH_CURR_A*(pow((X_H2),0.25));

ZZ_A=exp((ALPHA_A*FARADAY*(C_UDSI(c,t,0)-C_UDSI(c,t,1)))/(UNI_GAS_CONS*C_T(c,t)));

ZZZ_A=exp(-(ALPHA_C*FARADAY*(C_UDSI(c,t,0)-C_UDSI(c,t,1)))/(UNI_GAS_CONS*C_T(c,t)));

RXN_RATE_A=Z_A*(ZZ_A-ZZZ_A);

C_UDMI(c,t,0)=RXN_RATE_A;

Z_C=ACT_AREA_C*REF_EXCH_CURR_C*pow(X_O2,0.375)*pow (X_CO2,(-1.25));

ZZ_C=exp((ALPHA_A*FARADAY*(-(C_UDSI(c,t,0)-C_UDSI(c,t,1)-REV_POT)))/(UNI_GAS_CONS*C_T(c,t)));

ZZZ_C=exp(-(ALPHA_C*FARADAY*(-(C_UDSI(c,t,0)-C_UDSI(c,t,1)-REV_POT)))/(UNI_GAS_CONS*C_T(c,t)));

RXN_RATE_C=Z_C*(ZZ_C-ZZZ_C);

C_UDMI(c,t,1)=RXN_RATE_C;

}

aleisia · June 23, 2011, 18:53

Hi, have you figured out the way to eliminate the
"warning C4700: uninitialized local variable 't' used
warning C4700: uninitialized local variable 'c' used"?

I have the same problem in mu UDF, can you please share your experience with me?

Thanks!

Quote:

Originally Posted by MASOUD

Hi,
I get the following error:

warning C4700: uninitialized local variable 't' used
warning C4700: uninitialized local variable 'c' used

When I compile the UDF (for line 65)

What could be the reason?

Here is the code:

***************************

#include "udf.h"
#include "sg.h"

/* Define which user-defined scalars to use. */
enum
{
E_CHARGE_UDS,
C_CHARGE_UDS,
N_REQUIRED_UDS
};

static real ACT_AREA_A=270;
static real ACT_AREA_C=300;
static real REF_EXCH_CURR_A=2.1;
static real REF_EXCH_CURR_C=0.40;
static real REV_POT=1.02;
static real MW_H2=0.032;
static real MW_H2O=0.032;
static real MW_O2=0.032;
static real MW_CO2=0.044;
static real MW_N2=0.032;
static real MW_MIX;
static real X_H2;
static real X_H2O;
static real X_O2;
static real X_CO2;
static real X_N2;
static real ALPHA_A=1.5;
static real ALPHA_C=0.5;
static real NO_ELEC=2;
static real FARADAY=96485;
static real UNI_GAS_CONS=8.314;
static real STOCH_H2=-1;
static real STOCH_H2O=1;
static real STOCH_O2=-0.5;
static real STOCH_CO2_A=1;
static real STOCH_CO2_C=-1;
static real RXN_RATE_A;
static real RXN_RATE_C;
static real Z_A;
static real ZZ_A;
static real ZZZ_A;
static real Z_C;
static real ZZ_C;
static real ZZZ_C;
static real source;
static real u=0.0;
static real domain_ID=30;

DEFINE_ADJUST(SUR,d)
{
u+=0.001;
}

DEFINE_ADJUST(UDM,d)
{
Thread *t;
cell_t c;

MW_MIX=MW_H2*C_YI(c,t,0)+MW_O2*C_YI(c,t,1)+MW_CO2* C_YI(c,t,2)+MW_H2O*C_YI(c,t,3)+MW_N2*C_YI(c,t,4);
X_H2=C_YI(c,t,0)*MW_H2/MW_MIX;
X_O2=C_YI(c,t,1)*MW_O2/MW_MIX;
X_CO2=C_YI(c,t,2)*MW_CO2/MW_MIX;
X_H2O=C_YI(c,t,3)*MW_H2O/MW_MIX;
X_N2=C_YI(c,t,4)*MW_N2/MW_MIX;

Z_A=ACT_AREA_A*REF_EXCH_CURR_A*(pow((X_H2),0.25));

ZZ_A=exp((ALPHA_A*FARADAY*(C_UDSI(c,t,0)-C_UDSI(c,t,1)))/(UNI_GAS_CONS*C_T(c,t)));

ZZZ_A=exp(-(ALPHA_C*FARADAY*(C_UDSI(c,t,0)-C_UDSI(c,t,1)))/(UNI_GAS_CONS*C_T(c,t)));

RXN_RATE_A=Z_A*(ZZ_A-ZZZ_A);

C_UDMI(c,t,0)=RXN_RATE_A;

Z_C=ACT_AREA_C*REF_EXCH_CURR_C*pow(X_O2,0.375)*pow (X_CO2,(-1.25));

ZZ_C=exp((ALPHA_A*FARADAY*(-(C_UDSI(c,t,0)-C_UDSI(c,t,1)-REV_POT)))/(UNI_GAS_CONS*C_T(c,t)));

ZZZ_C=exp(-(ALPHA_C*FARADAY*(-(C_UDSI(c,t,0)-C_UDSI(c,t,1)-REV_POT)))/(UNI_GAS_CONS*C_T(c,t)));

RXN_RATE_C=Z_C*(ZZ_C-ZZZ_C);

C_UDMI(c,t,1)=RXN_RATE_C;

}

MASOUD · June 24, 2011, 01:59

Yes, I had not included the looping macro.

Here is the corrected version of the above UDF with some changes:
====================

DEFINE_ADJUST(CUR_DEN_A,d)
{
cell_t c;
Thread *t= Lookup_Thread(d,ID_A);

double CURR_D_A;
double Z_A;
double ZZ_A;
double ZZZ_A;
double OV_P_A;

double MW_MIX_A;
double X_H2;
double X_H2O;
double X_CO2_A;

if (FLUID_THREAD_P(t))
begin_c_loop(c,t)
{

/*MW_MIX=(C_R(c,t)*UNI_GAS_CONS*C_T(c,t))/C_P(c,t);*/

MW_MIX_A=1/((C_YI(c,t,0)/MW_H2)+(C_YI(c,t,2)/MW_CO2)+(C_YI(c,t,3)/MW_H2O)
);

X_H2=C_YI(c,t,0)*MW_MIX_A/MW_H2;
X_CO2_A=C_YI(c,t,2)*MW_MIX_A/MW_CO2;
X_H2O=1-(X_CO2_A+X_H2);

Z_A=ACT_AREA_A*REF_EXCH_CURR_A*(pow((X_H2),0.25))* (pow((X_H2O),0.25))*(pow((X_CO2_A),0.25));
OV_P_A=C_UDSI(c,t,0)-C_UDSI(c,t,1);
ZZ_A=exp(ALPHA_AA*FARADAY*OV_P_A/(UNI_GAS_CONS*C_T(c,t)));
ZZZ_A=exp(-ALPHA_CA*FARADAY*OV_P_A/(UNI_GAS_CONS*C_T(c,t)));
CURR_D_A=Z_A*(ZZ_A-ZZZ_A);

C_UDMI(c,t,13)=OV_P_A;

C_UDMI(c,t,14)=Z_A;
C_UDMI(c,t,15)=ZZ_A;
C_UDMI(c,t,16)=ZZZ_A;

C_UDMI(c,t,0)=u*CURR_D_A;

}
end_c_loop(c,t)
}

Kanarya · November 26, 2012, 06:24

hi,
I have the same error with following code:
#include "udf.h"
DEFINE_EXECUTE_AT_END(measure_mass_flow)
{
float mass_flow, abs_v;
Domain *d;
Thread *t;
cell_t c;
mass_flow=0.;
/* Get the domain 1 (Mixture) */
d = Get_Domain(1);
abs_v=sqrt(C_U(c,t)*C_U(c,t)+C_V(c,t)*C_V(c,t));
thread_loop_c(t, d)
{
if( THREAD_ID(t) == 5 )
{
begin_c_loop(c, t)
{

mass_flow+=C_R(c,t)*abs_v ;
mass_flow=C_UDMI(c,t,0);
}
end_c_loop(c,t)
}

printf("mass_flow in outlet:%f/n",mass_flow);
}
}
can you help me?
thanks in advance!

SARAHAVASHI · October 14, 2016, 05:59

i have the same problem with my code
can u help me?
thanks.
here is my code:
#include "udf.h"

DEFINE_PROFILE(slip_ncond_x,face_thread,i)
// x velocity for non conductive wall
{
real zeta_p;
Thread *t;
cell_t c;
zeta_p = -0.2*(C_T(c, t) - 273) - 78.2;
face_t f;
cell_t neig;
Thread *cell_thread;
Domain *domain = Get_Domain(1);
real vel,normal_magnitude,E_normal_x,E_normal_y,E_repai red_x,E_repaired_y;
real NV_VEC(A);
real mu=0.001003;
real eps0=8.85e-12;
real eps=80.1;

//cell_thread=THREAD_T1(face_thread);
cell_thread=THREAD_T0(face_thread);

begin_f_loop(f,face_thread)
{
neig=F_C0(f,face_thread);
// Repair E component values............................................ .................................................. ...
F_AREA(A,f,face_thread);
//Message("x is %g\n", A[0]);

normal_magnitude=pow( pow(A[0],2)+pow(A[1],2),0.5);

if ( NULL != THREAD_STORAGE(cell_thread,SV_UDS_I(0)) && NULL != T_STORAGE_R_NV(cell_thread,SV_UDSI_G(0)) )
{
E_normal_x=ND_DOT(-C_UDSI_G(neig,cell_thread,0)[0],-C_UDSI_G(neig,cell_thread,0)[1],0,A[0],A[1],0)/pow(normal_magnitude,2)*A[0];
E_normal_y=ND_DOT(-C_UDSI_G(neig,cell_thread,0)[0],-C_UDSI_G(neig,cell_thread,0)[1],0,A[0],A[1],0)/pow(normal_magnitude,2)*A[1];

E_repaired_x=-C_UDSI_G(neig,cell_thread,0)[0]-E_normal_x;
E_repaired_y=-C_UDSI_G(neig,cell_thread,0)[1]-E_normal_y;
}
else
E_repaired_x = 0 ;
//.................................................. .................................................. ........................
F_PROFILE(f,face_thread,i)=-eps0*eps*zeta_p*E_repaired_x/mu;
}
end_f_loop(f,face_thread)
}

Zbynek · October 17, 2016, 05:24

You are trying to use thread t in C_T(c,t) but the program does not know what t is since you did not specify it anywhere. If you want to access temperature value C_T(c,t) in every cell of a thread (which I suppose you would like to do), then you need to use looping macro begin_c_loop(c,t) first which will loop over all cells of a specified thread. And you need to specify the thread still. Maybe cell_thread is what you want to use?

September 22, 2010, 00:19	error: uninitialized local variable 't' used	#1
MASOUD Senior Member MASOUD Join Date: Mar 2009 Posts: 102 Rep Power: 17	Hi, I get the following error: warning C4700: uninitialized local variable 't' used warning C4700: uninitialized local variable 'c' used When I compile the UDF (for line 65) What could be the reason? Here is the code: *************************** #include "udf.h" #include "sg.h" /* Define which user-defined scalars to use. / enum { E_CHARGE_UDS, C_CHARGE_UDS, N_REQUIRED_UDS }; static real ACT_AREA_A=270; static real ACT_AREA_C=300; static real REF_EXCH_CURR_A=2.1; static real REF_EXCH_CURR_C=0.40; static real REV_POT=1.02; static real MW_H2=0.032; static real MW_H2O=0.032; static real MW_O2=0.032; static real MW_CO2=0.044; static real MW_N2=0.032; static real MW_MIX; static real X_H2; static real X_H2O; static real X_O2; static real X_CO2; static real X_N2; static real ALPHA_A=1.5; static real ALPHA_C=0.5; static real NO_ELEC=2; static real FARADAY=96485; static real UNI_GAS_CONS=8.314; static real STOCH_H2=-1; static real STOCH_H2O=1; static real STOCH_O2=-0.5; static real STOCH_CO2_A=1; static real STOCH_CO2_C=-1; static real RXN_RATE_A; static real RXN_RATE_C; static real Z_A; static real ZZ_A; static real ZZZ_A; static real Z_C; static real ZZ_C; static real ZZZ_C; static real source; static real u=0.0; static real domain_ID=30; DEFINE_ADJUST(SUR,d) { u+=0.001; } DEFINE_ADJUST(UDM,d) { Thread t; cell_t c; MW_MIX=MW_H2C_YI(c,t,0)+MW_O2C_YI(c,t,1)+MW_CO2* C_YI(c,t,2)+MW_H2OC_YI(c,t,3)+MW_N2C_YI(c,t,4); X_H2=C_YI(c,t,0)MW_H2/MW_MIX; X_O2=C_YI(c,t,1)MW_O2/MW_MIX; X_CO2=C_YI(c,t,2)MW_CO2/MW_MIX; X_H2O=C_YI(c,t,3)MW_H2O/MW_MIX; X_N2=C_YI(c,t,4)MW_N2/MW_MIX; Z_A=ACT_AREA_AREF_EXCH_CURR_A(pow((X_H2),0.25)); ZZ_A=exp((ALPHA_AFARADAY(C_UDSI(c,t,0)-C_UDSI(c,t,1)))/(UNI_GAS_CONSC_T(c,t))); ZZZ_A=exp(-(ALPHA_CFARADAY(C_UDSI(c,t,0)-C_UDSI(c,t,1)))/(UNI_GAS_CONSC_T(c,t))); RXN_RATE_A=Z_A(ZZ_A-ZZZ_A); C_UDMI(c,t,0)=RXN_RATE_A; Z_C=ACT_AREA_CREF_EXCH_CURR_Cpow(X_O2,0.375)pow (X_CO2,(-1.25)); ZZ_C=exp((ALPHA_AFARADAY(-(C_UDSI(c,t,0)-C_UDSI(c,t,1)-REV_POT)))/(UNI_GAS_CONSC_T(c,t))); ZZZ_C=exp(-(ALPHA_CFARADAY(-(C_UDSI(c,t,0)-C_UDSI(c,t,1)-REV_POT)))/(UNI_GAS_CONSC_T(c,t))); RXN_RATE_C=Z_C(ZZ_C-ZZZ_C); C_UDMI(c,t,1)=RXN_RATE_C; }

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
How to write k and epsilon before the abnormal end	xiuying	OpenFOAM Running, Solving & CFD	8	August 27, 2013 16:33
[blockMesh] BlockMeshmergePatchPairs	hjasak	OpenFOAM Meshing & Mesh Conversion	11	August 15, 2008 08:36
IcoFoam parallel woes	msrinath80	OpenFOAM Running, Solving & CFD	9	July 22, 2007 03:58
Could anybody help me see this error and give help	liugx212	OpenFOAM Running, Solving & CFD	3	January 4, 2006 19:07
Replace periodic by inlet-outlet pair	lego	CFX	3	November 5, 2002 21:09

June 24, 2011, 01:59		#3
MASOUD Senior Member MASOUD Join Date: Mar 2009 Posts: 102 Rep Power: 17	Yes, I had not included the looping macro. Here is the corrected version of the above UDF with some changes: ==================== DEFINE_ADJUST(CUR_DEN_A,d) { cell_t c; Thread t= Lookup_Thread(d,ID_A); double CURR_D_A; double Z_A; double ZZ_A; double ZZZ_A; double OV_P_A; double MW_MIX_A; double X_H2; double X_H2O; double X_CO2_A; if (FLUID_THREAD_P(t)) begin_c_loop(c,t) { /MW_MIX=(C_R(c,t)UNI_GAS_CONSC_T(c,t))/C_P(c,t);/ MW_MIX_A=1/((C_YI(c,t,0)/MW_H2)+(C_YI(c,t,2)/MW_CO2)+(C_YI(c,t,3)/MW_H2O) ); X_H2=C_YI(c,t,0)MW_MIX_A/MW_H2; X_CO2_A=C_YI(c,t,2)MW_MIX_A/MW_CO2; X_H2O=1-(X_CO2_A+X_H2); Z_A=ACT_AREA_AREF_EXCH_CURR_A(pow((X_H2),0.25)) (pow((X_H2O),0.25))(pow((X_CO2_A),0.25)); OV_P_A=C_UDSI(c,t,0)-C_UDSI(c,t,1); ZZ_A=exp(ALPHA_AAFARADAYOV_P_A/(UNI_GAS_CONSC_T(c,t))); ZZZ_A=exp(-ALPHA_CAFARADAYOV_P_A/(UNI_GAS_CONSC_T(c,t))); CURR_D_A=Z_A(ZZ_A-ZZZ_A); C_UDMI(c,t,13)=OV_P_A; C_UDMI(c,t,14)=Z_A; C_UDMI(c,t,15)=ZZ_A; C_UDMI(c,t,16)=ZZZ_A; C_UDMI(c,t,0)=u*CURR_D_A; } end_c_loop(c,t) }

November 26, 2012, 06:24		#4
Kanarya Senior Member Join Date: May 2011 Posts: 231 Rep Power: 16	hi, I have the same error with following code: #include "udf.h" DEFINE_EXECUTE_AT_END(measure_mass_flow) { float mass_flow, abs_v; Domain d; Thread t; cell_t c; mass_flow=0.; /* Get the domain 1 (Mixture) / d = Get_Domain(1); abs_v=sqrt(C_U(c,t)C_U(c,t)+C_V(c,t)C_V(c,t)); thread_loop_c(t, d) { if( THREAD_ID(t) == 5 ) { begin_c_loop(c, t) { mass_flow+=C_R(c,t)abs_v ; mass_flow=C_UDMI(c,t,0); } end_c_loop(c,t) } printf("mass_flow in outlet:%f/n",mass_flow); } } can you help me? thanks in advance!

October 14, 2016, 05:59	hi	#5
SARAHAVASHI New Member SARA Join Date: Jul 2016 Posts: 2 Rep Power: 0	i have the same problem with my code can u help me? thanks. here is my code: #include "udf.h" DEFINE_PROFILE(slip_ncond_x,face_thread,i) // x velocity for non conductive wall { real zeta_p; Thread t; cell_t c; zeta_p = -0.2(C_T(c, t) - 273) - 78.2; face_t f; cell_t neig; Thread cell_thread; Domain domain = Get_Domain(1); real vel,normal_magnitude,E_normal_x,E_normal_y,E_repai red_x,E_repaired_y; real NV_VEC(A); real mu=0.001003; real eps0=8.85e-12; real eps=80.1; //cell_thread=THREAD_T1(face_thread); cell_thread=THREAD_T0(face_thread); begin_f_loop(f,face_thread) { neig=F_C0(f,face_thread); // Repair E component values............................................ .................................................. ... F_AREA(A,f,face_thread); //Message("x is %g\n", A[0]); normal_magnitude=pow( pow(A[0],2)+pow(A[1],2),0.5); if ( NULL != THREAD_STORAGE(cell_thread,SV_UDS_I(0)) && NULL != T_STORAGE_R_NV(cell_thread,SV_UDSI_G(0)) ) { E_normal_x=ND_DOT(-C_UDSI_G(neig,cell_thread,0)[0],-C_UDSI_G(neig,cell_thread,0)[1],0,A[0],A[1],0)/pow(normal_magnitude,2)A[0]; E_normal_y=ND_DOT(-C_UDSI_G(neig,cell_thread,0)[0],-C_UDSI_G(neig,cell_thread,0)[1],0,A[0],A[1],0)/pow(normal_magnitude,2)A[1]; E_repaired_x=-C_UDSI_G(neig,cell_thread,0)[0]-E_normal_x; E_repaired_y=-C_UDSI_G(neig,cell_thread,0)[1]-E_normal_y; } else E_repaired_x = 0 ; //.................................................. .................................................. ........................ F_PROFILE(f,face_thread,i)=-eps0epszeta_p*E_repaired_x/mu; } end_f_loop(f,face_thread) }

October 17, 2016, 05:24		#6
Zbynek Member Join Date: Jun 2016 Posts: 66 Rep Power: 11	You are trying to use thread t in C_T(c,t) but the program does not know what t is since you did not specify it anywhere. If you want to access temperature value C_T(c,t) in every cell of a thread (which I suppose you would like to do), then you need to use looping macro begin_c_loop(c,t) first which will loop over all cells of a specified thread. And you need to specify the thread still. Maybe cell_thread is what you want to use?