A negative temperature value (-700°C) appears during the welding simulation

frank_wzz · May 15, 2017, 11:06

Hallo,everyone

I am doing a simulation on Multi-layer welding with ANSYS by using the double ellipsoid heat source and Element Birth Technique. In the simulation process there has been a very strange phenomenon. If I use the BFE command to apply the heat generation rate to the element, some elements, which are not activated, have results -700°C temperature, but the final result is correct. However, if I use the BF command to apply the heat generation rate to the node, the phenomenon of -700°C does not exist, but the final result is wrong. What is the reason? How should I solve it? Thanks a lot

uuivw · June 11, 2017, 07:29

Quote:

Originally Posted by frank_wzz

Hallo,everyone

I am doing a simulation on Multi-layer welding with ANSYS by using the double ellipsoid heat source and Element Birth Technique. In the simulation process there has been a very strange phenomenon. If I use the BFE command to apply the heat generation rate to the element, some elements, which are not activated, have results -700°C temperature, but the final result is correct. However, if I use the BF command to apply the heat generation rate to the node, the phenomenon of -700°C does not exist, but the final result is wrong. What is the reason? How should I solve it? Thanks a lot

Hi, I just share my result on youtube ,check it out here https://www.youtube.com/watch
I think you should take care of boundry condition

May 15, 2017, 11:06	A negative temperature value (-700°C) appears during the welding simulation	#1
frank_wzz New Member Zhuozhao Wu Join Date: May 2017 Posts: 1 Rep Power: 0	Hallo,everyone I am doing a simulation on Multi-layer welding with ANSYS by using the double ellipsoid heat source and Element Birth Technique. In the simulation process there has been a very strange phenomenon. If I use the BFE command to apply the heat generation rate to the element, some elements, which are not activated, have results -700°C temperature, but the final result is correct. However, if I use the BF command to apply the heat generation rate to the node, the phenomenon of -700°C does not exist, but the final result is wrong. What is the reason? How should I solve it? Thanks a lot

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