Changing heat source in ANSYS

jnow · October 20, 2019, 10:52

Dear Colleagues,

I have got a little problem which I hope you could help with.

I would like to use heat source which is decreasing in time period (e.g. 18MW in 1 sec, 15 MW in 2 sec, etc.). It's decay heat from low-power nuclear reactor, geometry at this moment is not so important, I will just use simple geometry in 2D.

Is it possible to solve this issue in ANSYS? Does anybody know how to do it?

Thank you in advance for your help.

sheaker · October 21, 2019, 01:37

Hello. I believe You can use "expression" as an input (I don't have time to confirm it right now). Here is an expression I was using for varying inlet temperature. I think You can modify in for Your purpose:

Code:

300[K] + if(t>6300[s],0[K],if(t>5400[s],600[K],if(t>4500[s],0[K],if(t>3600[s],600[K],if(t>2700[s],0[K],if(t>1800[s],600[K],if(t>900[s],0[K],600[K])))))

Best regards,
Sheaker

October 20, 2019, 10:52	Changing heat source in ANSYS	#1
jnow New Member Join Date: Oct 2019 Posts: 1 Rep Power: 0	Dear Colleagues, I have got a little problem which I hope you could help with. I would like to use heat source which is decreasing in time period (e.g. 18MW in 1 sec, 15 MW in 2 sec, etc.). It's decay heat from low-power nuclear reactor, geometry at this moment is not so important, I will just use simple geometry in 2D. Is it possible to solve this issue in ANSYS? Does anybody know how to do it? Thank you in advance for your help. Last edited by jnow; October 20, 2019 at 18:22.

October 21, 2019, 01:37		#2
sheaker Senior Member Oskar Join Date: Nov 2015 Location: Poland Posts: 184 Rep Power: 11	Hello. I believe You can use "expression" as an input (I don't have time to confirm it right now). Here is an expression I was using for varying inlet temperature. I think You can modify in for Your purpose: Code: 300[K] + if(t>6300[s],0[K],if(t>5400[s],600[K],if(t>4500[s],0[K],if(t>3600[s],600[K],if(t>2700[s],0[K],if(t>1800[s],600[K],if(t>900[s],0[K],600[K]))))) Best regards, Sheaker __________________ How to set two stroke engine with scavenging? Salome, sliding interface and "Zero length edge detected."

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