CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Running, Solving & CFD

GAMG solver causes troubles

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   May 10, 2011, 11:02
Default GAMG solver causes troubles
  #1
Senior Member
 
Join Date: Aug 2010
Location: Groningen, The Netherlands
Posts: 216
Rep Power: 18
colinB is on a distinguished road
Hey there,

it has been a while since my last post here, but no working again with OF troubles come back

my problem is the following error message that I encountered during my calculationon a hydrofoil:
(before that happens the number of iterations for solving the pressure reach their maximum)
Code:
#0  Foam::error::printStack(Foam::Ostream&) in "/opt/openfoam171/lib/linuxGccDPOpt/libOpenFOAM.so"
#1  Foam::sigFpe::sigFpeHandler(int) in "/opt/openfoam171/lib/linuxGccDPOpt/libOpenFOAM.so"
#2  Uninterpreted: 
#3  Foam::GAMGSolver::scalingFactor(Foam::Field<double>&,  Foam::Field<double> const&, Foam::Field<double>  const&, Foam::Field<double> const&) const in  &quot;/opt/openfoam171/lib/linuxGccDPOpt/libOpenFOAM.so&quot;
#4  Foam::GAMGSolver::scalingFactor(Foam::Field<double>&,  Foam::lduMatrix const&, Foam::Field<double>&,  Foam::FieldField<Foam::Field, double> const&,  Foam::UPtrList<Foam::lduInterfaceField const> const&,  Foam::Field<double> const&, unsigned char) const in  &quot;/opt/openfoam171/lib/linuxGccDPOpt/libOpenFOAM.so&quot;
#5   Foam::GAMGSolver::Vcycle(Foam::PtrList<Foam::lduMatrix::smoother>  const&, Foam::Field<double>&, Foam::Field<double>  const&, Foam::Field<double>&,  Foam::Field<double>&, Foam::Field<double>&,  Foam::PtrList<Foam::Field<double> >&,  Foam::PtrList<Foam::Field<double> >&, unsigned char)  const in  &quot;/opt/openfoam171/lib/linuxGccDPOpt/libOpenFOAM.so&quot;
#6  Foam::GAMGSolver::solve(Foam::Field<double>&,  Foam::Field<double> const&, unsigned char) const in  &quot;/opt/openfoam171/lib/linuxGccDPOpt/libOpenFOAM.so&quot;
#7  Foam::fvMatrix<double>::solve(Foam::dictionary const&) in  &quot;/opt/openfoam171/lib/linuxGccDPOpt/libfiniteVolume.so&quot;
#8  
 in &quot;/opt/openfoam171/applications/bin/linuxGccDPOpt/interFoam&quot;
#9  __libc_start_main in &quot;/lib/tls/i686/cmov/libc.so.6&quot;
#10  
 in &quot;/opt/openfoam171/applications/bin/linuxGccDPOpt/interFoam&quot;
Unfortunately I have no clue what it means and also my search on google and here in the forum didn't gave me sufficient help.

Attached you find the case including the log file but wo results
so if you want to run it simply type:

blockMesh
setFields
interFoam

it is a rather simple case with ~ 110k cells

I guess the trouble comes from the &quot;special&quot; layer I introduced with alpha1=0.5 which I did for avoiding interference of a sharp changeover from the airInlet and waterInlet.
Eventually also the grid maybe troubling. But checkMesh accepts it.

parts of the log you see here (it doesn't fit into the case folder)

Code:
Courant Number mean: 0.000140728 max: 0.930393
Interface Courant Number mean: 3.19131e-06 max: 0.930393
deltaT = 1.32721e-05
Time = 0.458845

MULES: Solving for alpha1
Liquid phase volume fraction = 0.525029  Min(alpha1) = -1.20388  Max(alpha1) = 1.00001
MULES: Solving for alpha1
Liquid phase volume fraction = 0.525029  Min(alpha1) = -1.24572  Max(alpha1) = 1.00001
MULES: Solving for alpha1
Liquid phase volume fraction = 0.525029  Min(alpha1) = -1.28785  Max(alpha1) = 1.00001
MULES: Solving for alpha1
Liquid phase volume fraction = 0.525029  Min(alpha1) = -1.33024  Max(alpha1) = 1.00001
DILUPBiCG:  Solving for Ux, Initial residual = 0.0335748, Final residual = 8.67805e-13, No Iterations 2
DILUPBiCG:  Solving for Uz, Initial residual = 0.113298, Final residual = 2.72921e-07, No Iterations 1
GAMG:  Solving for p_rgh, Initial residual = 0.0649962, Final residual = 0.00032663, No Iterations 41
GAMG:  Solving for p_rgh, Initial residual = 0.000332293, Final residual = 3.24954e-06, No Iterations 100
GAMG:  Solving for p_rgh, Initial residual = 1.11011e-05, Final residual = 1.10477e-07, No Iterations 290
time step continuity errors : sum local = 1.88113e-11, global = -8.98642e-12, cumulative = -8.38788e-05
GAMG:  Solving for p_rgh, Initial residual = 0.0119578, Final residual = 8.14812e-05, No Iterations 2
GAMG:  Solving for p_rgh, Initial residual = 8.20786e-05, Final residual = 7.75983e-07, No Iterations 36
GAMG:  Solving for p_rgh, Initial residual = 1.38782e-06, Final residual = 1.31951e-08, No Iterations 137
time step continuity errors : sum local = 9.66489e-12, global = -8.98642e-12, cumulative = -8.38788e-05
GAMG:  Solving for p_rgh, Initial residual = 0.00137856, Final residual = 2.8292e-06, No Iterations 2
GAMG:  Solving for p_rgh, Initial residual = 3.04841e-06, Final residual = 2.87014e-08, No Iterations 102
GAMG:  Solving for p_rgh, Initial residual = 2.43316e-07, Final residual = 9.43905e-09, No Iterations 231
time step continuity errors : sum local = 8.99151e-12, global = -8.98642e-12, cumulative = -8.38788e-05
GAMG:  Solving for p_rgh, Initial residual = 0.000148687, Final residual = 6.88212e-07, No Iterations 1
GAMG:  Solving for p_rgh, Initial residual = 8.41732e-07, Final residual = 9.84476e-09, No Iterations 253
GAMG:  Solving for p_rgh, Initial residual = 2.06668e-07, Final residual = 9.83106e-09, No Iterations 236
time step continuity errors : sum local = 9.00801e-12, global = -8.98642e-12, cumulative = -8.38788e-05
ExecutionTime = 2818.28 s  ClockTime = 2862 s

Courant Number mean: 0.000127959 max: 0.844884
Interface Courant Number mean: 4.37856e-06 max: 0.844884
deltaT = 1.25508e-05
Time = 0.458858

MULES: Solving for alpha1
Liquid phase volume fraction = 0.525029  Min(alpha1) = -1.31119  Max(alpha1) = 1.00001
MULES: Solving for alpha1
Liquid phase volume fraction = 0.525029  Min(alpha1) = -1.2924  Max(alpha1) = 1.00001
MULES: Solving for alpha1
Liquid phase volume fraction = 0.525029  Min(alpha1) = -1.27387  Max(alpha1) = 1.00001
MULES: Solving for alpha1
Liquid phase volume fraction = 0.525029  Min(alpha1) = -1.25562  Max(alpha1) = 1.00001
DILUPBiCG:  Solving for Ux, Initial residual = 0.0169796, Final residual = 1.86494e-07, No Iterations 1
DILUPBiCG:  Solving for Uz, Initial residual = 0.080901, Final residual = 4.03905e-11, No Iterations 2
GAMG:  Solving for p_rgh, Initial residual = 0.311232, Final residual = 0.00210653, No Iterations 3
GAMG:  Solving for p_rgh, Initial residual = 0.00227784, Final residual = 1.54957e-05, No Iterations 11
GAMG:  Solving for p_rgh, Initial residual = 3.70093e-05, Final residual = 2.54066e-07, No Iterations 11
time step continuity errors : sum local = 2.12385e-11, global = -7.17953e-12, cumulative = -8.38788e-05
GAMG:  Solving for p_rgh, Initial residual = 0.109349, Final residual = 0.00081582, No Iterations 4
GAMG:  Solving for p_rgh, Initial residual = 0.000898281, Final residual = 7.66732e-06, No Iterations 12
GAMG:  Solving for p_rgh, Initial residual = 3.44177e-05, Final residual = 2.52469e-07, No Iterations 9
time step continuity errors : sum local = 1.23284e-11, global = -7.17953e-12, cumulative = -8.38788e-05
GAMG:  Solving for p_rgh, Initial residual = 0.0671865, Final residual = 0.00060329, No Iterations 4
GAMG:  Solving for p_rgh, Initial residual = 0.000683255, Final residual = 6.25839e-06, No Iterations 12
GAMG:  Solving for p_rgh, Initial residual = 3.07815e-05, Final residual = 3.06285e-07, No Iterations 8
time step continuity errors : sum local = 1.38091e-11, global = -7.17953e-12, cumulative = -8.38788e-05
GAMG:  Solving for p_rgh, Initial residual = 0.0652599, Final residual = 0.000571597, No Iterations 4
GAMG:  Solving for p_rgh, Initial residual = 0.000580785, Final residual = 5.32414e-06, No Iterations 12
GAMG:  Solving for p_rgh, Initial residual = 2.36578e-05, Final residual = 2.32577e-07, No Iterations 8
time step continuity errors : sum local = 2.1247e-11, global = -7.17953e-12, cumulative = -8.38788e-05
ExecutionTime = 2828.13 s  ClockTime = 2872 s

Courant Number mean: 0.000124125 max: 0.921853
Interface Courant Number mean: 3.42458e-06 max: 0.921853
deltaT = 1.08773e-05
Time = 0.458869

MULES: Solving for alpha1
Liquid phase volume fraction = 0.525029  Min(alpha1) = -1.28124  Max(alpha1) = 1.00001
MULES: Solving for alpha1
Liquid phase volume fraction = 0.525029  Min(alpha1) = -1.30668  Max(alpha1) = 1.00001
MULES: Solving for alpha1
Liquid phase volume fraction = 0.525029  Min(alpha1) = -1.33194  Max(alpha1) = 1.00001
MULES: Solving for alpha1
Liquid phase volume fraction = 0.525029  Min(alpha1) = -1.35701  Max(alpha1) = 1.00001
DILUPBiCG:  Solving for Ux, Initial residual = 0.0362697, Final residual = 3.75729e-07, No Iterations 1
DILUPBiCG:  Solving for Uz, Initial residual = 0.118264, Final residual = 8.8751e-07, No Iterations 1
GAMG:  Solving for p_rgh, Initial residual = 0.109203, Final residual = 2.88085e+32, No Iterations 1000
GAMG:  Solving for p_rgh, Initial residual = 0.239738, Final residual = 1.58254e+33, No Iterations 1000
GAMG:  Solving for p_rgh, Initial residual = 0.239738, Final residual = 1.58254e+33, No Iterations 1000
time step continuity errors : sum local = 3.92821e+95, global = -2.13933e+79, cumulative = -2.13933e+79
GAMG:  Solving for p_rgh, Initial residual = 0.336348, Final residual = 3.22301e+33, No Iterations 1000
I hope I provided all information you need, if not let me know.
I appreciate your help

regards Colin
Attached Files
File Type: gz caseHydrofoil4.tar.gz (8.2 KB, 7 views)
colinB is offline   Reply With Quote

Old   May 11, 2011, 11:42
Default
  #2
Senior Member
 
Matthias Voß
Join Date: Mar 2009
Location: Berlin, Germany
Posts: 449
Rep Power: 20
mvoss is on a distinguished road
How can alpha1 become negative ?
Did you also tried another solver ?
mvoss is offline   Reply With Quote

Old   May 11, 2011, 12:31
Default
  #3
Senior Member
 
Join Date: Aug 2010
Location: Groningen, The Netherlands
Posts: 216
Rep Power: 18
colinB is on a distinguished road
good question! I don't know! Some deviations are nornmal in my Opinion ( I sometimes encounter min alpha1 10e-200 or so wich I consider to be zero)
But that big negativ deviations I haven't seen before (actually I just recognized)

no I haven't! any suggestions for different solvers?
colinB is offline   Reply With Quote

Old   January 26, 2013, 16:57
Default
  #4
Senior Member
 
immortality's Avatar
 
Ehsan
Join Date: Oct 2012
Location: Iran
Posts: 2,208
Rep Power: 26
immortality is on a distinguished road
hi.could you send me your GAMG solver to me?
Thanks.
immortality is offline   Reply With Quote

Old   June 13, 2013, 02:48
Default
  #5
Member
 
laurentL
Join Date: Oct 2011
Location: new caledonia
Posts: 73
Rep Power: 14
laurent98 is on a distinguished road
hi Colin,
did you solve this problem? because i got the same kind of alpha growing to much
alpha going to 7 then 13. then crach..
also on a hydrofoil...
thank you LL
laurent98 is offline   Reply With Quote

Old   June 13, 2013, 08:48
Default
  #6
Senior Member
 
immortality's Avatar
 
Ehsan
Join Date: Oct 2012
Location: Iran
Posts: 2,208
Rep Power: 26
immortality is on a distinguished road
Colin change your scheme to limited schemes and reduce time step.
__________________
Injustice Anywhere is a Threat for Justice Everywhere.Martin Luther King.
To Be or Not To Be,Thats the Question!
The Only Stupid Question Is the One that Goes Unasked.
immortality is offline   Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
different results between serial solver and parallel solver wlt_1985 FLUENT 11 October 12, 2018 09:23
GAMG Solver tutlhino OpenFOAM Running, Solving & CFD 5 January 26, 2013 17:01
Differences between serial and parallel runs carsten OpenFOAM Bugs 11 September 12, 2008 12:16
why the solver reject it? Anyone with experience? bearcat CFX 6 April 28, 2008 15:08
SonicTurbFoam crashes when turbulence is added gastovski OpenFOAM Running, Solving & CFD 0 January 21, 2008 08:49


All times are GMT -4. The time now is 04:08.