error divergen detected in AMG solver

Sulaiman · March 28, 2018, 22:27

i have problem on my simulation rocket missile on fluent 6.3. the problem is "error: divergen detected in AMG solver" and "error: divergen detected in AMG solver: temperatur" on mach 1( AOA 16), MACH 2 (AOA 8 and 12

. but on mach 1 with AOA 0, 4, 8 no problem..... how to troublelshooting this problem
thanks
#ask

AlexanderZ · March 29, 2018, 01:15

decrease timestep

best regards

Sulaiman · March 29, 2018, 22:07

Quote:

Originally Posted by AlexanderZ

decrease timestep

best regards

how to decrease timestep sir

AlexanderZ · March 30, 2018, 04:49

if your simulation is transient, than you may play with timestep
if your simulation is steady state, than most likely, your mesh is not good enough.

you may try to change attack angle smoothly:
simulate AOA 0
than change AOA to 5 (for instance) but do not reinitialize, but continue simualtion.
than change AOA to 10, and so on...

best regards

Sulaiman · March 31, 2018, 00:00

this is my meshing sir

Sulaiman · March 31, 2018, 00:05

Quote:

Originally Posted by AlexanderZ

if your simulation is transient, than you may play with timestep
if your simulation is steady state, than most likely, your mesh is not good enough.

you may try to change attack angle smoothly:
simulate AOA 0
than change AOA to 5 (for instance) but do not reinitialize, but continue simualtion.
than change AOA to 10, and so on...

best regards

how to make good meshing ? on this configuration

March 28, 2018, 22:27	error divergen detected in AMG solver	#1
Sulaiman New Member Sulaiman Join Date: Mar 2018 Posts: 4 Rep Power: 8	i have problem on my simulation rocket missile on fluent 6.3. the problem is "error: divergen detected in AMG solver" and "error: divergen detected in AMG solver: temperatur" on mach 1( AOA 16), MACH 2 (AOA 8 and 12. but on mach 1 with AOA 0, 4, 8 no problem..... how to troublelshooting this problem thanks #ask

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March 29, 2018, 01:15		#2
AlexanderZ Senior Member Alexander Join Date: Apr 2013 Posts: 2,363 Rep Power: 34	decrease timestep best regards

March 30, 2018, 04:49		#4
AlexanderZ Senior Member Alexander Join Date: Apr 2013 Posts: 2,363 Rep Power: 34	if your simulation is transient, than you may play with timestep if your simulation is steady state, than most likely, your mesh is not good enough. you may try to change attack angle smoothly: simulate AOA 0 than change AOA to 5 (for instance) but do not reinitialize, but continue simualtion. than change AOA to 10, and so on... best regards

March 31, 2018, 00:00		#5
Sulaiman New Member Sulaiman Join Date: Mar 2018 Posts: 4 Rep Power: 8	this is my meshing sir