FOAM FATAL ERROR Maximum number of iterations exceeded

eromir · May 28, 2017, 04:34

The solution is exactly depends on your mesh quality and BC.

For Mesh quality:
I think you know what it the proper mesh scheme to you problem. CheckMesh and fix it. So i skip this step,

For BC:
If I mention that this restriction, the main composer of this problem pressure value;
It should not be enter as 0. You can use 0.001 instead of 0
And also please look at the K and epsillon value for BC.

If you solve rhoPimpleFoam
you shoul also deep dive to you deltaT, sometime it requires less than 1e-8.

foadsf · August 24, 2018, 09:51

Guys,

I posted a question here in Stackexchange to see if we can get the Brent solver implemented after all! Please take a look . maybe you can help.

calf.Z · January 3, 2019, 23:13

I have encountered the same error after several iterations of pimple. I tried to decrease the deltaT and modify the BC of k,epsilon. But the error still happen during solving EEqn.

I guess maybe it caused by the calculation of h and T. Can someone give me some hints? Thank you.

calf.Z · January 3, 2019, 23:17

I have encountered the same error after several iterations of pimple. I tried to decrease the deltaT and modify the BC of k,epsilon. But the error still happen during solving EEqn.

I guess maybe it caused by the calculation of h and T. Can someone give me some hints? Thank you.

Artur.Ant · September 26, 2019, 12:10

In my case it was boundary conditions.
I solved the problem (no transitory) starting with lower difference of temperature between BCs and increasing it sofetly once the previous solution converged!

Artur.Ant · September 26, 2019, 12:14

In my case it was boundary conditions.
I solved the problem (no transitory) starting with lower difference of temperature between BCs and increasing it sofetly once the previous solution converged!

jcoelho5 · February 15, 2022, 05:39

Quote:

Originally Posted by foadsf

Guys,

I posted a question here in Stackexchange to see if we can get the Brent solver implemented after all! Please take a look . maybe you can help.

Was there any update on this issue? The link does not work.

I also had the same problem with max iterations. With constant properties, it works, but I need to have tabulated properties for rho (and the only way to have it for rho, is to have it for every other property). Did anyone solve had this problem?

Thanks.

foadsf · February 15, 2022, 06:17

Sadly my post was deleted over there �� I copy-pasted the content of my post here in this Gist

quarkz · February 13, 2024, 21:42

Hi all,

I'm solving a problem involving flow past heated plate. The iteration problem arises when I add gravity to buoyantSimpleFoam (initial g 0).

When I add gravity = -2 m/s2, it didn't work. However, changing the relaxationFactors of h from 0.99 to 0.3 helped ... to a certain extent.

When I increase g to -3 m/s2, it failed again but the error is:

Negative initial temperature T0

Reducing further to 0.1 helped again.

So this is something that one can try.

May 28, 2017, 04:34	Solution:	#41
eromir New Member Omur Icke Join Date: Apr 2016 Posts: 6 Rep Power: 10	The solution is exactly depends on your mesh quality and BC. For Mesh quality: I think you know what it the proper mesh scheme to you problem. CheckMesh and fix it. So i skip this step, For BC: If I mention that this restriction, the main composer of this problem pressure value; It should not be enter as 0. You can use 0.001 instead of 0 And also please look at the K and epsillon value for BC. If you solve rhoPimpleFoam you shoul also deep dive to you deltaT, sometime it requires less than 1e-8.

August 24, 2018, 09:51	Implementing Brent solver instead of Newton method in thermoI.H	#42
foadsf Member Foad Join Date: Aug 2017 Posts: 58 Rep Power: 8	Guys, I posted a question here in Stackexchange to see if we can get the Brent solver implemented after all! Please take a look . maybe you can help.

September 26, 2019, 12:10	Boundary Conditions	#45
Artur.Ant Member Arthur Join Date: Aug 2014 Location: Italy Posts: 47 Rep Power: 11	In my case it was boundary conditions. I solved the problem (no transitory) starting with lower difference of temperature between BCs and increasing it sofetly once the previous solution converged!

September 26, 2019, 12:14	Boundary Conditions	#46
Artur.Ant Member Arthur Join Date: Aug 2014 Location: Italy Posts: 47 Rep Power: 11	In my case it was boundary conditions. I solved the problem (no transitory) starting with lower difference of temperature between BCs and increasing it sofetly once the previous solution converged!

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January 3, 2019, 23:13		#43
calf.Z Senior Member Jianrui Zeng Join Date: May 2018 Location: China Posts: 157 Rep Power: 7	I have encountered the same error after several iterations of pimple. I tried to decrease the deltaT and modify the BC of k,epsilon. But the error still happen during solving EEqn. I guess maybe it caused by the calculation of h and T. Can someone give me some hints? Thank you.

January 3, 2019, 23:17		#44
calf.Z Senior Member Jianrui Zeng Join Date: May 2018 Location: China Posts: 157 Rep Power: 7	I have encountered the same error after several iterations of pimple. I tried to decrease the deltaT and modify the BC of k,epsilon. But the error still happen during solving EEqn. I guess maybe it caused by the calculation of h and T. Can someone give me some hints? Thank you.

February 15, 2022, 06:17		#48
foadsf Member Foad Join Date: Aug 2017 Posts: 58 Rep Power: 8	Sadly my post was deleted over there �� I copy-pasted the content of my post here in this Gist

February 13, 2024, 21:42		#49
quarkz Senior Member TWB Join Date: Mar 2009 Posts: 400 Rep Power: 19	Hi all, I'm solving a problem involving flow past heated plate. The iteration problem arises when I add gravity to buoyantSimpleFoam (initial g 0). When I add gravity = -2 m/s2, it didn't work. However, changing the relaxationFactors of h from 0.99 to 0.3 helped ... to a certain extent. When I increase g to -3 m/s2, it failed again but the error is: Negative initial temperature T0 Reducing further to 0.1 helped again. So this is something that one can try.