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Problem with udf radiation model in 2d combustion model..???? |
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July 28, 2009, 09:44 |
Problem with udf radiation model in 2d combustion model..????
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siva kumar
Join Date: Jul 2009
Posts: 13
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Hi,,,This is siva kumar from IIT MADRAS....while am interpret my udf the error is showing like.....
Error: FLUENT received fatal signal (ACCESS_VIOLATION) 1. Note exact events leading to error. 2. Save case/data under new name. 3. Exit program and restart to continue. 4. Report error to your distributor. Error Object: () this error is coming in my fluent model when i interpret the source code as shown in below....fuel is methane #include "udf.h" DEFINE_SOURCE(energy,c,t,ds,eqn) { /*FILE *fp;*/ real source,tep,sigma,Pamb,tamb; real MW[18]; real Xh2o,Xco,Xco2,Xch4,ph2o,pco,pco2,pch4; real MWmix,sum=0; real kapa,absh2o,absco,absco2,absch4; real a0,a1,a2,a3,a4,a5; real b0,b1,b2,b3,b4,b5; real c0,c1,c2,c3,c4; real d0,d1,d2,d3,d4; int i; /*fp=fopen("properties.txt","w");*/ tep=C_T(c,t); MW[0]=1; MW[1]=32; MW[2]=17; MW[3]=16; MW[4]=2; MW[5]=18; MW[6]=33; MW[7]=28; MW[8]=44; MW[9]=16; MW[10]=15; MW[11]=14; MW[12]=30; MW[13]=29; MW[14]=31; MW[15]=34; MW[16]=13; MW[17]=28; sigma=0.000000056697; Pamb=1.0; tamb=298.0; a0=18.741; a1=-121.310; a2=273.500; a3=-194.05; a4=56.31; a5=-5.8169; b0=-0.23093; b1=1.12393; b2=9.4153; b3=-2.99880; b4=0.51382; b5=-.000018684; c0=6.6334; c1=-0.0035686; c2=0.000000016682; c3=0.00000000025611; c4=-0.000000000000026558; if(tep<=750) { d0=4.7869; d1=-0.06953; d2=0.000295775; d3=-0.000000425732; d4=0.000000000202894; } else if(tep>750) { d0=10.09; d1=-0.01183; d2=0.0000047753; d3=-0.000000000587209; d4=-0.000000000000025334; } for(i=0;i<18;i++) { sum=sum+C_YI(c,t,i)/MW[i]; } MWmix=1/sum; Xh2o=C_YI(c,t,5)*MWmix/18; Xco=C_YI(c,t,7)*MWmix/28; Xco2=C_YI(c,t,8)*MWmix/44; Xch4=C_YI(c,t,9)*MWmix/16; ph2o=Xh2o*Pamb; pco=Xco*Pamb; pco2=Xco2*Pamb; pch4=Xch4*Pamb; absch4=c0+(c1*tep)+(c2*pow(tep,2))+(c3*pow(tep,3)) +(c4*pow(tep,4) ); absco2=a0+(a1*(1000/tep))+(a2*pow(1000/tep,2))+(a3*pow(1000/tep,3 ))+(a4*pow(1000/tep,4))+(a5*pow(1000/tep,5)); absco=d0+(d1*tep)+(d2*pow(tep,2))+(d3*pow(tep,3))+ (d4*pow(tep,4)) ; absh2o=b0+(b1*(1000/tep))+(b2*pow(1000/tep,2))+(b3*pow(1000/tep,3 ))+(b4*pow(1000/tep,4))+(b5*pow(1000/tep,5)); kapa=(absch4*pch4)+(absco*pco)+(absco2*pco2)+(absh 2o*ph2o); source=-(4*sigma*kapa*(pow(tep,4)-pow(tamb,4))); /*fprintf(fp,"%f%f%f\n",tep,source,MWmix);*/ ds[eqn]=0; return source; } why the error is coming i don't know please help me?????? |
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