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ODE Solver: Seulex

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Old   December 24, 2014, 18:50
Default ODE Solver: Seulex
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Josh Dawson
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Hello everyone, I am using the seulex ode solver for a hydrogen /air combustion scenario. I received a run time warning:

FOAM Warning :
From function seulex::solve(scalar& x, scalarField& y, stepState&
in file ODESolvers/seulex/seulex.C at line 255
step size underflow :2.64698e-23.

I've searched the internet and the blogs here on this site and I haven't found anything that addresses the cause of this warning. I feel like it is rooted in the concentration gradients or potentially the pressure or temperature which are used to calculate reaction equilibrium rates because it's crashed the simulation due to a floating point exception. Or I should say the warning is expressed rapidly just before the simulation fails. Can anyone help me understand what causes this error please? I would really appreciate the help! I can post any of my files if necessary.
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Old   December 27, 2014, 13:58
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Josh Dawson
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I guess no one knows?
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Old   December 27, 2014, 14:49
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hi,

Did you try other ODE solvers? The usual, I use RADAU5 for this staff =)


Thx, Dmitry
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Old   December 27, 2014, 14:52
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Josh Dawson
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Thank you Dmitry for your response, I've been searching high and low for information on the ODE solvers within OpenFOAM and there just isn't much information available. It's a fairly stiff system and the only information I was able to find suggested using the Seulex solver for stiff systems.
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Old   December 27, 2014, 14:58
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I could suggest to try my solver edcPisoFoam =) which is based on rhoReactingFoam and incorporates the Eddy Dissipation Concept with a detailed chemistry approach for the turbulence-chemistry interaction. I have finished my PhD related to OpenFOAM and turbulent combustion modeling with OpenFOAM this year using this solver, so it has good validation and references =)

edcPisoFoam utilizes the RADAU5 algorithm which is implicit 5th order RK method for stiff chemistry kinetics.

You can download it for free from: http://www.edcpisofoam.decgroup.org/
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Old   December 29, 2014, 13:41
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Josh Dawson
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Thank you very much for your suggestions as well as your offer to use the solver you developed. I just downloaded the solver and will probably spend the next week or so going though it. I like the challenge of creating my own but look forward to learning from the construction of yours. Very much appreciated!

Regards
Josh
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Old   March 2, 2016, 17:52
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Hello, JMDag2004.

Did you get a solution to your problem? If yes, I do have the same problem and would appreciate your help.

Thank you!
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Old   November 25, 2016, 10:41
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Zhiyi Li
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Have you tried to decrease the relative tolerance. I decreased from 0.01 to 0.0001. That warning message doesn't appear then.
Kummi, Dequan and wsp like this.
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Old   January 13, 2017, 04:40
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Yan Zhang
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Hi Dmitry,
I cannot dowload the code of edcPisoFoam from www.edcpisofoam.decgroup.org.
can you send me a copy of it?
my email: zytju@tju.edu.cn
Thank you!
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Old   May 3, 2020, 14:55
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Jiaui Zhang
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I have the same warning, but luckily my case does not crash, I just wonder what case this warning and does this warning affect the result?
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Old   August 31, 2021, 06:12
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sanjeev adhikari
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Quote:
Originally Posted by dimaCFD View Post
I could suggest to try my solver edcPisoFoam =) which is based on rhoReactingFoam and incorporates the Eddy Dissipation Concept with a detailed chemistry approach for the turbulence-chemistry interaction. I have finished my PhD related to OpenFOAM and turbulent combustion modeling with OpenFOAM this year using this solver, so it has good validation and references =)

edcPisoFoam utilizes the RADAU5 algorithm which is implicit 5th order RK method for stiff chemistry kinetics.

You can download it for free from: http://www.edcpisofoam.decgroup.org/

webpage is not available to download can you email it ? I am having similar issues with stiff ODE problem. i am looking for RADAU5 email: 071bme435sanjeev@ioe.edu.np
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Old   October 31, 2022, 22:29
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BISSAI NKAA
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Hi Dmitry,
I can't download the edcPisoFoam code from www.edcpisofoam.decgroup.org . Can you send me a copy?
My email is: santelima8@gmail
Thanks!
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