{"id":51774,"date":"2021-01-31T13:24:52","date_gmt":"2021-01-31T13:24:52","guid":{"rendered":"\/forum\/forums\/topic\/fluent-boundary-conditions-udf-heat-flux-convective-losses-rediation-losses-error\/"},"modified":"2021-01-31T13:24:52","modified_gmt":"2021-01-31T13:24:52","slug":"fluent-boundary-conditions-udf-heat-flux-convective-losses-rediation-losses-error","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/fluent-boundary-conditions-udf-heat-flux-convective-losses-rediation-losses-error\/","title":{"rendered":"FLUENT Boundary conditions UDF (heat flux &#8211; convective losses &#8211; rediation losses), error"},"content":{"rendered":"<p>Hi folks,nI am creating my first UDF and I have a problem, I do not understand how to read the face wall temperature\u00a0n. Can anyone help me?. The code is almost ready except how to input this temperature. Many thanks in advance.nPS: If i set up temperature at 500 K all calculus are ok, but I would need to read the real one!nn#include udf.hn#define QMAX 407400 \/* W\/m2 *\/n#define EEPSILON 0.1n#define TAU 5.67e-8n#define T_AIRE 300n#define H_AIRE 40 \/* convective coef.W\/m2K *\/nn\/* profile for heat flux*\/nDEFINE_PROFILE(heatflux_profile, t, i)nn{n\/* variable declaration *\/nreal centroide[ND_ND]; \/* vector position *\/nreal x;nreal y;nface_t f;ncell_t cell;nreal seno; \/* heat distribution *\/nreal T_p; \/* wall temperature *\/begin_f_loop(f, t)n{nF_CENTROID(centroide,f,t);nx=centroide[0]; \/* valor del cntroide en la componente x *\/ny=centroide[1]; \/* valor del cntroide en la componente y *\/nseno=y\/sqrt((x*x)+(y*y));T_p = 500; \/*\u00a0<strong>I NEED TO FIND THE FUNCTION IN ORDER TO READ THE WALL TEMPERATURE<\/strong>, DO NOT WHY F_T(f,t) DOES NOT WORK, it should be\u00a0\u00a0T_p = F_T(f,t) *\/nnif (0 < y)n{nF_PROFILE(f,t,i)=(QMAX*seno)-TAU*((T_p*T_p*T_p*T_p )-(EEPSILON*T_AIRE*T_AIRE*T_AIRE*T_AIRE))-H_AIRE*(T_ p-T_AIRE);nn} else {nF_PROFILE(f,t,i)=0;n}n}nend_f_loop(f, t)n}n\n<\/p>\n","protected":false},"template":"","class_list":["post-51774","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hi folks,nI am creating my first UDF and I have a problem, I do not understand how to read the face wall temperature n. 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