# initial value and UDF

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 January 13, 2011, 10:41 initial value and UDF #1 Member   EH Join Date: Dec 2010 Posts: 61 Rep Power: 6 Hi all, Does anyone know, after initializing my problem, will the following command in my UDF: T=C_T(c,t); result in T being the initial value? My problem is I have the following UDF: Code: ``` #include "udf.h" /* Mean temperature at outlet is calculated from the surrounding nodes */ /* Coordinate of the outlet is (x,y,z) = (0.275,-0.0138,-0.6747) */ DEFINE_ADJUST(outlet_temp,d) { double Tout=0.0; double Temp; double coord[ND_ND]; double xmin=0.273; double xmax=0.277; double ymin=-0.00675; double ymax=0.0; double zmin=-0.6858; double zmax=-0.6628; double x,y,z; double ncell=1.0; int nfaces=0; cell_t c; Thread *tt=Lookup_Thread(d, 31); /* Begin loop to determine the temperature at the centroid of cells near the outlet */ begin_c_loop(c,tt) { C_CENTROID(coord,c,tt); x=coord[0]; y=coord[1]; z=coord[2]; if ((x >= xmin) & (x <=xmax)) { if ((y >= ymin) && (y <= ymax)) { if ((z >= zmin) && (z <= zmax)) { Temp = C_T(c,tt); /* Cell temperature */ Tout += Temp; ncell ++; /* Number of cells */ printf("ncell= %d\n", ncell); } } } } end_c_loop(c,tt) Tout=Tout/(ncell-1); /* Average cell temperature surrounding outlet */ printf("Tout= %d\n", Tout); }``` the first printf statement gives ncell=0, when it should keep increasing while Tout = 0 when it should be the initial value that I initialize. Does anyone know why? Thanks. Cheers, EH