Natural convection simulation doesn't converge

KsaMe · July 1, 2020, 20:17

Hi everyone,

I'm trying to simulate the natural convection within a closes chamber that contains two copper plates at 900°C and its walls are at 100°C. When I did the simulation without gravity and using a coupled solve method, it converge really well, but when I add gravity don't.

I attached a picture that show the geometry used and also the distribution of density within the chamber in absence of gravity.

If anyone could help me with some advice I would really appreciate it.

Best regards,

KsaMe

AlexanderZ · July 2, 2020, 04:51

there are several video on youtube how to simulate natural convection, follow step by step

KsaMe · July 2, 2020, 19:42

Hi AlexanderZ,

Thansk for your reply. I watched the videos but unfortunately they use incompressible ideal gas when tried to simulate the transient behavior and I need to use ideal gas because the density and temperature difference in the system I'm working on is an important issue.

AlexanderZ · July 2, 2020, 21:42

https://www.youtube.com/watch?v=EmRFfvqfOrs

KsaMe · July 2, 2020, 23:11

Thanks AlexanderZ. I also watched that video and the problem is that he used the pseudo-transient option and I need to look at the transient behavior. However when I used the pseudo-transient option it converge and I can see the behavior of the steady-state solution. Do you know how to make it converge in transient mode?

Regards,

KsaMe

July 2, 2020, 04:51		#2
AlexanderZ Senior Member Alexander Join Date: Apr 2013 Posts: 2,363 Rep Power: 34	there are several video on youtube how to simulate natural convection, follow step by step __________________ best regards ****************************** press LIKE if this message was helpful

July 2, 2020, 21:42		#4
AlexanderZ Senior Member Alexander Join Date: Apr 2013 Posts: 2,363 Rep Power: 34	https://www.youtube.com/watch?v=EmRFfvqfOrs __________________ best regards ****************************** press LIKE if this message was helpful

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July 2, 2020, 19:42		#3
KsaMe New Member Join Date: Jun 2020 Posts: 15 Rep Power: 6	Hi AlexanderZ, Thansk for your reply. I watched the videos but unfortunately they use incompressible ideal gas when tried to simulate the transient behavior and I need to use ideal gas because the density and temperature difference in the system I'm working on is an important issue.

July 2, 2020, 23:11		#5
KsaMe New Member Join Date: Jun 2020 Posts: 15 Rep Power: 6	Thanks AlexanderZ. I also watched that video and the problem is that he used the pseudo-transient option and I need to look at the transient behavior. However when I used the pseudo-transient option it converge and I can see the behavior of the steady-state solution. Do you know how to make it converge in transient mode? Regards, KsaMe