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August 2, 2012, 11:12 
> FOAM FATAL ERROR: Maximum number of iterations exceeded

#1 
Senior Member

hi everybody,
I'm solving free convection in 3D in OpenFOAM. my model is a cubic that its bottom temperature is at 400K and the upper plane is at 300K. the sides are isolated. I'm using buoyantPimpleFoam and when I ran it the below error appeared: Code:
> FOAM FATAL ERROR: Maximum number of iterations exceeded From function specieThermo<Thermo>::T(scalar f, scalar T0, scalar (specieThermo<Thermo>::*F)(const scalar) const, scalar (specieThermo<Thermo>::*dFdT)(const scalar) const) const in file /home/opencfd/OpenFOAM/OpenFOAM2.0.1/src/thermophysicalModels/specie/lnInclude/specieThermoI.H at line 67. FOAM aborting #0 Foam::error::printStack(Foam::Ostream&) in "/opt/openfoam201/platforms/linux64GccDPOpt/lib/libOpenFOAM.so" #1 Foam::error::abort() in "/opt/openfoam201/platforms/linux64GccDPOpt/lib/libOpenFOAM.so" #2 Foam::hRhoThermo<Foam::pureMixture<Foam::constTransport<Foam::specieThermo<Foam::hConstThermo<Foam::perfectGas> > > > >::calculate() in "/opt/openfoam201/platforms/linux64GccDPOpt/lib/libbasicThermophysicalModels.so" #3 Foam::hRhoThermo<Foam::pureMixture<Foam::constTransport<Foam::specieThermo<Foam::hConstThermo<Foam::perfectGas> > > > >::correct() in "/opt/openfoam201/platforms/linux64GccDPOpt/lib/libbasicThermophysicalModels.so" #4 in "/opt/openfoam201/platforms/linux64GccDPOpt/bin/buoyantPimpleFoam" #5 __libc_start_main in "/lib/libc.so.6" #6 in "/opt/openfoam201/platforms/linux64GccDPOpt/bin/buoyantPimpleFoam" Aborted Thank you Last edited by adambarfi; August 2, 2012 at 11:58. 

August 2, 2012, 12:45 

#2 
Senior Member
Marco A. Turcios
Join Date: Mar 2009
Location: Vancouver, BC, Canada
Posts: 735
Rep Power: 21 
The crash occurs because there is no convergence when solving for the temperature from the enthalpy using the hConst species thermo model. Have a look at the following thread for some insight into what is happening:
Declaration of function TH() As for how to fix it, have a look at your enthalpy values and see what they are doing. It could be failing for any number of reasons: Newton's Method  Failure Analysis How many iterations have you run when it crahes? Do you notice anything odd about the temperature? Make your write interval smaller to try and see where the problems occur. 

August 2, 2012, 13:54 

#3  
Senior Member

Quote:
Thank you for your reply. this is the full results: Code:
/**\  =========    \\ / F ield  OpenFOAM: The Open Source CFD Toolbox   \\ / O peration  Version: 2.0.1   \\ / A nd  Web: www.OpenFOAM.com   \\/ M anipulation   \**/ Build : 2.0.151f1de99a4bc Exec : buoyantSimpleFoam Date : Aug 02 2012 Time : 22:15:47 Host : mostafadesktop PID : 2069 Case : /home/mostafa/OpenFOAM/mostafa2.0.1/run/tutorials/heatTransfer/buoyantSimpleFoam/hotRoom nProcs : 1 sigFpe : Enabling floating point exception trapping (FOAM_SIGFPE). fileModificationChecking : Monitoring runtime modified files using timeStampMaster allowSystemOperations : Disallowing usersupplied system call operations // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // Create time Create mesh for time = 0 Reading g Reading thermophysical properties Selecting thermodynamics package hPsiThermo<pureMixture<constTransport<specieThermo<hConstThermo<perfectGas>>>>> Reading field U Reading/calculating face flux field phi Creating turbulence model Selecting RAS turbulence model kEpsilon kEpsilonCoeffs { Cmu 0.09; C1 1.44; C2 1.92; C3 0.33; sigmak 1; sigmaEps 1.3; Prt 1; } Calculating field g.h Reading field p_rgh SIMPLE: convergence criteria field p_rgh tolerance 0.01 field U tolerance 0.001 field h tolerance 0.001 field "(kepsilonomega)" tolerance 0.001 Starting time loop Time = 1 DILUPBiCG: Solving for Ux, Initial residual = 0.995791, Final residual = 0.0952429, No Iterations 15 DILUPBiCG: Solving for Uy, Initial residual = 1, Final residual = 0.06838, No Iterations 30 DILUPBiCG: Solving for Uz, Initial residual = 6.30029e13, Final residual = 6.30029e13, No Iterations 0 DILUPBiCG: Solving for h, Initial residual = 1, Final residual = 0.0953589, No Iterations 46 DICPCG: Solving for p_rgh, Initial residual = 0.999987, Final residual = 0.00846449, No Iterations 70 time step continuity errors : sum local = 3.32469, global = 1.6675e16, cumulative = 1.6675e16 rho max/min : 2.09115 0.229763 DILUPBiCG: Solving for epsilon, Initial residual = 0.881107, Final residual = 0.0484186, No Iterations 20 DILUPBiCG: Solving for k, Initial residual = 1, Final residual = 0.053242, No Iterations 2 bounding k, min: 0.00328955 max: 561.915 average: 38.5853 ExecutionTime = 1.66 s ClockTime = 4 s Time = 2 DILUPBiCG: Solving for Ux, Initial residual = 0.778599, Final residual = 0.0675986, No Iterations 34 DILUPBiCG: Solving for Uy, Initial residual = 0.707139, Final residual = 0.0665317, No Iterations 2 DILUPBiCG: Solving for Uz, Initial residual = 0.778599, Final residual = 0.0675986, No Iterations 34 DILUPBiCG: Solving for h, Initial residual = 0.974791, Final residual = 0.0548783, No Iterations 4 DICPCG: Solving for p_rgh, Initial residual = 0.995251, Final residual = 0.0099475, No Iterations 24 time step continuity errors : sum local = 618.141, global = 1.12147e13, cumulative = 1.11981e13 rho max/min : 897.524 2804.43 DILUPBiCG: Solving for epsilon, Initial residual = 0.0118022, Final residual = 0.0118152, No Iterations 1001 bounding epsilon, min: 1.005e+14 max: 8.22138e+13 average: 6.92457e+08 DILUPBiCG: Solving for k, Initial residual = 1.41234e07, Final residual = 1.41234e07, No Iterations 0 ExecutionTime = 6.83 s ClockTime = 9 s Time = 3 DILUPBiCG: Solving for Ux, Initial residual = 0.885872, Final residual = 0.0430187, No Iterations 21 DILUPBiCG: Solving for Uy, Initial residual = 0.828654, Final residual = 0.0514202, No Iterations 26 DILUPBiCG: Solving for Uz, Initial residual = 0.887219, Final residual = 0.0527398, No Iterations 21 DILUPBiCG: Solving for h, Initial residual = 1, Final residual = 0.041242, No Iterations 3 DICPCG: Solving for p_rgh, Initial residual = 0.999199, Final residual = 9.20109, No Iterations 1001 time step continuity errors : sum local = 3.15157e+11, global = 6.37253e06, cumulative = 6.37253e06 rho max/min : 3.06985e+11 2.33027e+11 DILUPBiCG: Solving for epsilon, Initial residual = 0.516331, Final residual = 0.0441885, No Iterations 1 bounding epsilon, min: 2.26825e+24 max: 1.63517e+26 average: 3.51799e+21 DILUPBiCG: Solving for k, Initial residual = 0.981172, Final residual = 0.0828003, No Iterations 1 bounding k, min: 1.60611e+23 max: 4.27903e+27 average: 1.01515e+23 ExecutionTime = 9.48 s ClockTime = 11 s Time = 4 DILUPBiCG: Solving for Ux, Initial residual = 0.909059, Final residual = 0.062452, No Iterations 4 DILUPBiCG: Solving for Uy, Initial residual = 0.987006, Final residual = 0.0514382, No Iterations 4 DILUPBiCG: Solving for Uz, Initial residual = 0.967417, Final residual = 0.03232, No Iterations 4 DILUPBiCG: Solving for h, Initial residual = 1, Final residual = 0.084893, No Iterations 2 > FOAM FATAL ERROR: Maximum number of iterations exceeded From function specieThermo<Thermo>::T(scalar f, scalar T0, scalar (specieThermo<Thermo>::*F)(const scalar) const, scalar (specieThermo<Thermo>::*dFdT)(const scalar) const) const in file /home/opencfd/OpenFOAM/OpenFOAM2.0.1/src/thermophysicalModels/specie/lnInclude/specieThermoI.H at line 67. FOAM aborting #0 Foam::error::printStack(Foam::Ostream&) in "/opt/openfoam201/platforms/linux64GccDPOpt/lib/libOpenFOAM.so" #1 Foam::error::abort() in "/opt/openfoam201/platforms/linux64GccDPOpt/lib/libOpenFOAM.so" #2 Foam::hPsiThermo<Foam::pureMixture<Foam::constTransport<Foam::specieThermo<Foam::hConstThermo<Foam::perfectGas> > > > >::calculate() in "/opt/openfoam201/platforms/linux64GccDPOpt/lib/libbasicThermophysicalModels.so" #3 Foam::hPsiThermo<Foam::pureMixture<Foam::constTransport<Foam::specieThermo<Foam::hConstThermo<Foam::perfectGas> > > > >::correct() in "/opt/openfoam201/platforms/linux64GccDPOpt/lib/libbasicThermophysicalModels.so" #4 in "/opt/openfoam201/platforms/linux64GccDPOpt/bin/buoyantSimpleFoam" #5 __libc_start_main in "/lib/libc.so.6" #6 in "/opt/openfoam201/platforms/linux64GccDPOpt/bin/buoyantSimpleFoam" Aborted 

August 2, 2012, 14:00 

#4 
Senior Member
Marco A. Turcios
Join Date: Mar 2009
Location: Vancouver, BC, Canada
Posts: 735
Rep Power: 21 
You've got a lot of problems with your case setup; rho, k and epsilon are all blowing up! My guess is that paying more attention to your boundary and initial conditions will solve the issues. Have a look at the tutorial cases and see if your boundary conditions are consistent for walls and open boundaries.


August 2, 2012, 14:33 

#5  
Senior Member

Quote:
Thanks Marco, I'm trying to solve natural convection in a closed box. in first post I explain it. I check the boundary, they are alright. I'm so confused! I guess this errors are originated from my meshes. I should check it. 

August 2, 2012, 15:10 

#6 
Senior Member

hi
My bottom temperature is 3000K. when I reduce it to 400K there is no error!!! why?!? anybody knows? 

August 2, 2012, 15:12 

#7 
Senior Member
Marco A. Turcios
Join Date: Mar 2009
Location: Vancouver, BC, Canada
Posts: 735
Rep Power: 21 
What do you mean bottom temperature? Bottom of the room, bottom range of interpolation?


August 2, 2012, 16:05 

#8  
Senior Member

Quote:
but I think they aren't true. the convection occurs weakly, but temperature is pretty high!!!! 

August 2, 2012, 16:39 

#9 
Senior Member
Marco A. Turcios
Join Date: Mar 2009
Location: Vancouver, BC, Canada
Posts: 735
Rep Power: 21 
Sounds like its a matter of tweaking the model, maybe selecting a different species thermophysical models. I haven't done much with free convection, so you'll have to ask someone with more experience.


August 2, 2012, 16:46 

#10 
Senior Member

Maybe you can try a lower deltaT in you controlDict file.
Regards 

August 3, 2012, 03:18 

#11  
Senior Member

Quote:
I tested it, again the convection was very weak. I solve this geometry with Fluent and it solved it correctly. but I don't understand why the temperature distribution is wrong?!?!?!? actually in my model the convection doesn't occur. the bottom plane remains at T=1000K and the rest remains T=300. do you know what is wrong? 

August 3, 2012, 05:56 

#12  
Senior Member

Quote:
I don't have too much experience in free convection. Maybe a person with more knowledge can help you. But i suggest you to have a look at this tutorial by Abolfazl Shiri: http://www.tfd.chalmers.se/~hani/kur...i/NC_Shiri.pdf Regards Mojtaba 

August 5, 2012, 06:45 

#13 
Senior Member

hi everybody,
again this error appears: Code:
> FOAM FATAL ERROR: Maximum number of iterations exceeded From function specieThermo<Thermo>::T(scalar f, scalar T0, scalar (specieThermo<Thermo>::*F)(const scalar) const, scalar (specieThermo<Thermo>::*dFdT)(const scalar) const) const in file /home/opencfd/OpenFOAM/OpenFOAM2.0.1/src/thermophysicalModels/specie/lnInclude/specieThermoI.H at line 67. FOAM aborting #0 Foam::error::printStack(Foam::Ostream&) in "/opt/openfoam201/platforms/linux64GccDPOpt/lib/libOpenFOAM.so" #1 Foam::error::abort() in "/opt/openfoam201/platforms/linux64GccDPOpt/lib/libOpenFOAM.so" #2 Foam::hPsiThermo<Foam::pureMixture<Foam::constTransport<Foam::specieThermo<Foam::hConstThermo<Foam::perfectGas> > > > >::calculate() in "/opt/openfoam201/platforms/linux64GccDPOpt/lib/libbasicThermophysicalModels.so" #3 Foam::hPsiThermo<Foam::pureMixture<Foam::constTransport<Foam::specieThermo<Foam::hConstThermo<Foam::perfectGas> > > > >::correct() in "/opt/openfoam201/platforms/linux64GccDPOpt/lib/libbasicThermophysicalModels.so" #4 in "/opt/openfoam201/platforms/linux64GccDPOpt/bin/buoyantSimpleFoam" #5 __libc_start_main in "/lib/libc.so.6" #6 in "/opt/openfoam201/platforms/linux64GccDPOpt/bin/buoyantSimpleFoam" Aborted please Help me 

August 5, 2012, 11:52 

#14 
Senior Member


August 6, 2012, 03:10 

#15  
Senior Member

Quote:
thank you Mojtaba 

July 21, 2013, 20:07 

#16 
Senior Member

I could solve it by defining zeroGradient boundary condition for p and p_rgh
__________________
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August 2, 2013, 07:58 

#17 
New Member
M Bay
Join Date: Jun 2013
Location: Germany
Posts: 10
Rep Power: 6 
Hi,
I m having the same Problem with my case. I m trying to simulate a constraction in free convection. After the first Time step i get: maximum number of iterations has been exceeded. exact the sameone that Mostafa got. can i post my case so you expert can take a look in it? because I tried everything and nothing seems to be working . I change the BC, the solver for AIR, the Delta, checkt the initial condition, working with other Relaxations Factores and checkMesh can find no problem with my Mesh. My porbleme apears when OP calculate h for my Air region. the T value seems to go higher then it should be. Please Please someone help. to Mostafa: dose your case work now? can you please post it ? Regards 

August 2, 2013, 15:04 

#18  
Senior Member

Quote:
Maybe you can use some bounded Div schemes in your fvscheme file. Try to play with different combinations of schemes. Try to use more bounded ones, instead of more accurate schemes. after some iterations you can change back to second order and unbounded schemes for more accuracy. best
__________________
Learn OpenFOAM in Persian for free, And ask your questions here. Complex Heat & Flow Simulation Research Group If you can't explain it simply, you don't understand it well enough. "Richard Feynman" 

August 5, 2013, 10:12 

#19 
New Member
M Bay
Join Date: Jun 2013
Location: Germany
Posts: 10
Rep Power: 6 
Hi Mojtaba,
sorry for the comend queation but i m new in OpenFoam. what do you mean with more bounded div schemes? I m using bounded Gauss upwind for all of my div schemes. Only for div(R) and div((muEff*... i m using Gauss linear. thank you Best Regards 

December 5, 2014, 13:31 

#20 
New Member
Join Date: Nov 2014
Posts: 11
Rep Power: 4 
Hi all,
i got the same problem. I am using the buoyantSimpleRadiationFoam. The problems is always at the second time step, when solving the G file. Any suggestions to fix this problem? Thank you, Best regards 

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