- **Fluent UDF and Scheme Programming**
(*https://www.cfd-online.com/Forums/fluent-udf/*)

- - **UDF for modelling heat loss in 2D**
(*https://www.cfd-online.com/Forums/fluent-udf/77268-udf-modelling-heat-loss-2d.html*)

UDF for modelling heat loss in 2DHI. I need help on how to construct a UDF, which can account for heat loss in a 2D channel. Thus effectively it will model 3D results from the 2D.
More details-http://FastFreeFileHosting.com/file/40127/UDf-bmp.html |

heat loss through walls#include "udf.h"
#include "math.h" #include "sg.h" DEFINE_PROFILE(HTCh, t, i) { face_t f; Thread *tco; cell_t co; /**thread data**/ real Tc=0; /**centraoid temperature of cells **/ real Ts2=0; /** secondary side temperature for Grashof no **/ real q=0; /** heat flux at face **/ begin_f_loop(f, t) { Ts = F_T(f,t); co =F_C0(f,t); tco=THREAD_T0(t); Tc=C_T(co,tco); BOUNDARY_FACE_GEOMETRY(f,t,A,ds,es,A_by_es,dr0); area = sqrt(A[0]*A[0]+A[1]*A[1]+A[2]*A[2]); theta=area/A_by_es; q=kl*abs(cos(theta))*(Tc-Ts)/ds; Ts2=Ts-(log(d/di)*q*di/(2*ki)); //for cylinder // Ts2=Ts- abs(dt*q/ki); // for rectangular slab |

This code will work better at solid meshed surface, but if u wish to use if fluid region you have to consider convective and transient energy terms too.
"Ts2" will give insulated body temperature, if u don't have insulation you can use directly "Ts" to calculate Gr number and using that u can relate with heat transfer coefficients. |

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