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Temp dependent emissivity udf

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Old   August 5, 2014, 08:06
Default Temp dependent emissivity udf
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Ross Drummond
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I need to write a UDF for temperature dependent emissivity in a continuous annealing rig. However i get this warning when building,
udf_names.c : warning C4113: 'void (*)()' differs in parameter lists from 'void (*)(void)'
it then loads without error, but when initialising i receive these errors,
Error: received a fatal signal (Segmentation fault).
Error Object: #f
I'm really struggling any help would be appreciated.

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File Type: c eudf.c (387 Bytes, 16 views)
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Old   September 25, 2014, 11:22
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Christina P.
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Hey Ross, I'm encountering this exact situation. Did you ever figure out what the problem was?
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Old   October 1, 2014, 14:11
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François Grégoire
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For some reason (bug?), you have to run the model with a constant external emissivity first. Then you set the external emissivity to 'my_emissivity':
#include "udf.h"
	real tempe;
	face_t f;
		tempe = F_T(f,t);
		F_PROFILE(f,t,i) = 2.54e-4*tempe;
P.S. don't use 'temp' as a variable name because it overrides a previous definition in Fluent
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Old   October 12, 2014, 07:31
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rasoul sogvar
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hello,how do I write non bosinesq for simulation of free convection of water?
I need for udf file,please help me
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emissivity, temperature dependent, udf

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