divergence detected in amg solver-tempearure

ramchander · August 8, 2014, 03:15

hi i am working on the multiphase flow problem in fluent 14.5,in this case the molten metal has flow out through the crucible outlet,
the problem is like a water is flow out through bottle,
i given velocity at inlet,gravity value in direction of flow my aim is to show flow in the respective directions,

but every time i got the message like DIVERGENCE DETECTED IN AMG SOLVER-X MOMENTUM.
and sometimes it's show error like YOUR GLOBAL COURANT NUMBER IS GRATER THAN 250.

pls help me in solving my problem

enayath · August 8, 2014, 10:26

Hi,

Try different options:

1- use Hybrid initialization..
2- if you are using Simple, reduce your under relaxation factors(momentum and pressure)...
3- make sure your mesh is fine(skewness value and minimum orthogonality)

Let me know...
Hooman

djn · August 12, 2014, 07:04

1.)Reduce relaxation factors
2.)change correction factor to flexible from V-cycle etc
3.)If using using steady change to Transient

August 8, 2014, 03:15	divergence detected in amg solver-tempearure	#1
ramchander New Member N.Ramchander Join Date: Apr 2014 Posts: 6 Rep Power: 12	hi i am working on the multiphase flow problem in fluent 14.5,in this case the molten metal has flow out through the crucible outlet, the problem is like a water is flow out through bottle, i given velocity at inlet,gravity value in direction of flow my aim is to show flow in the respective directions, but every time i got the message like DIVERGENCE DETECTED IN AMG SOLVER-X MOMENTUM. and sometimes it's show error like YOUR GLOBAL COURANT NUMBER IS GRATER THAN 250. pls help me in solving my problem

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August 8, 2014, 10:26		#2
enayath Senior Member Joe Join Date: Feb 2012 Location: Canada Posts: 111 Rep Power: 14	Hi, Try different options: 1- use Hybrid initialization.. 2- if you are using Simple, reduce your under relaxation factors(momentum and pressure)... 3- make sure your mesh is fine(skewness value and minimum orthogonality) Let me know... Hooman

August 12, 2014, 07:04		#3
djn New Member Dhananjaya Join Date: May 2014 Posts: 7 Rep Power: 11	1.)Reduce relaxation factors 2.)change correction factor to flexible from V-cycle etc 3.)If using using steady change to Transient