Absolute pressure solution-limit and temperature solution limit error

erkampasha · December 26, 2022, 17:06

Hello,

I am working on hypersonic internal flow which includes strong shock trains. Firstly i run the case with the parameters given below;

Dimension = 3D
Grid type=poly y+=1
Density based implicit solver
Courant Number = 1
First Order Upwind
High order term relaxation, warped-face gradient and convergence acceleration for streched meshes enabled
Flux Type = AUSM

With these options, i got an error absolute pressure at beginning of the iteration. I lowered the pressure limits to 0.001. However i got the error in mid of iterations. Beside that a few moments later temperature limits error appeared. I think numerical sheme is enough smooth and grid is enough fine.

What can you suggest for this issue?

AlexanderZ · December 27, 2022, 02:05

decrease speed of flow, get convergence, increase speed later

erkampasha · December 27, 2022, 02:14

Quote:

Originally Posted by AlexanderZ

decrease speed of flow, get convergence, increase speed later

Ok. Let me try. I ll give the feedback. Thank you for reply

December 26, 2022, 17:06	Absolute pressure solution-limit and temperature solution limit error	#1
erkampasha Member İbrahim Join Date: Jun 2017 Posts: 31 Rep Power: 8	Hello, I am working on hypersonic internal flow which includes strong shock trains. Firstly i run the case with the parameters given below; Dimension = 3D Grid type=poly y+=1 Density based implicit solver Courant Number = 1 First Order Upwind High order term relaxation, warped-face gradient and convergence acceleration for streched meshes enabled Flux Type = AUSM With these options, i got an error absolute pressure at beginning of the iteration. I lowered the pressure limits to 0.001. However i got the error in mid of iterations. Beside that a few moments later temperature limits error appeared. I think numerical sheme is enough smooth and grid is enough fine. What can you suggest for this issue?

December 27, 2022, 02:05		#2
AlexanderZ Senior Member Alexander Join Date: Apr 2013 Posts: 2,363 Rep Power: 34	decrease speed of flow, get convergence, increase speed later __________________ best regards ****************************** press LIKE if this message was helpful

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Absolute pressure not increasing in closed volume with a constant heat source	trashcan	ANSYS	5	March 24, 2023 04:08
Absolute pressure and temperature limited	arep_24	FLUENT	2	November 21, 2015 00:07
fluent error: absolute pressure limited to 1	treeman1	FLUENT	4	November 20, 2015 09:20
Limit error	Chander	CFX	1	October 9, 2011 17:39
what the result is negatif pressure at inlet	chong chee nan	FLUENT	0	December 29, 2001 05:13