Hot spots appearing in volume mesh

starccmuser · May 9, 2017, 22:25

I am running a simple cylindrical geometry with a high pressure region at the start of the simulation. Part way through the simulation, when the pressure wave has passed through an area of tube (which remains at a relatively steady pressure afterwards) spots of high pressure appear on the tube (see link below). I am using a volume extruded mesh which makes me think it isn't a meshing problem. Any ideas?

https://gyazo.com/9563716eea5b38ae64087523c474b2c1

wadeellis · May 25, 2017, 17:12

I have seen something like that but with temperature before. It may mean that the simulation hasn't converged all the way. So, you might try letting it run for a little while more to see if the pressure comes down. Otherwise, you might change the models you are using.

starccmuser · May 25, 2017, 20:45

Needed a lower time constant, problem resolved

May 9, 2017, 22:25	Hot spots appearing in volume mesh	#1
starccmuser New Member Join Date: May 2017 Posts: 2 Rep Power: 0	I am running a simple cylindrical geometry with a high pressure region at the start of the simulation. Part way through the simulation, when the pressure wave has passed through an area of tube (which remains at a relatively steady pressure afterwards) spots of high pressure appear on the tube (see link below). I am using a volume extruded mesh which makes me think it isn't a meshing problem. Any ideas? https://gyazo.com/9563716eea5b38ae64087523c474b2c1 Last edited by starccmuser; May 25, 2017 at 20:44.

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May 25, 2017, 17:12		#2
wadeellis New Member Wade Join Date: Jul 2015 Posts: 24 Rep Power: 11	I have seen something like that but with temperature before. It may mean that the simulation hasn't converged all the way. So, you might try letting it run for a little while more to see if the pressure comes down. Otherwise, you might change the models you are using.

May 25, 2017, 20:45		#3
starccmuser New Member Join Date: May 2017 Posts: 2 Rep Power: 0	Needed a lower time constant, problem resolved