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

Problem with SimpleFoam for a solution around an OneraM6 wing

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

Like Tree1Likes
  • 1 Post By gara1988

Reply
 
LinkBack Thread Tools Display Modes
Old   October 23, 2012, 08:59
Default Problem with SimpleFoam for a solution around an OneraM6 wing
  #1
New Member
 
Mattia
Join Date: Oct 2012
Location: Milan
Posts: 28
Rep Power: 4
gara1988 is on a distinguished road
Hello, I'm trying to find the solution, with simpleFoam, around a wing.

I did the mesh with GMSH, I checked it and it's ok!

When I run simpleFoam, after some time I have this error:

---------------------------------------------------------------------------------------------------------------------------

HTML Code:
/*---------------------------------------------------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  1.7.x                                 |
|   \\  /    A nd           | Web:      www.OpenFOAM.com                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
Build  : 1.7.x-131caa989cd3
Exec   : simpleFoam
Date   : Oct 23 2012
Time   : 14:48:03
Host   : mattia-Satellite-A100
PID    : 4265
Case   : /media/HDE_Mattia/TESI/OpenFoam_SIM/My_OneraM6
nProcs : 1
SigFpe : Enabling floating point exception trapping (FOAM_SIGFPE).

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Create time

Create mesh for time = 0

Reading field p

Reading field U

Reading/calculating face flux field phi

Selecting incompressible transport model Newtonian
Selecting RAS turbulence model kEpsilon
kEpsilonCoeffs
{
    Cmu             0.09;
    C1              1.44;
    C2              1.92;
    sigmaEps        1.3;
}


Starting time loop

Time = 1

smoothSolver:  Solving for Ux, Initial residual = 1, Final residual = 0.0156354, No Iterations 4
smoothSolver:  Solving for Uy, Initial residual = 1, Final residual = 0.0147744, No Iterations 4
smoothSolver:  Solving for Uz, Initial residual = 1, Final residual = 0.0141945, No Iterations 4
GAMG:  Solving for p, Initial residual = 1, Final residual = 0.0765887, No Iterations 5
time step continuity errors : sum local = 0.00785526, global = -6.37702e-05, cumulative = -6.37702e-05
DILUPBiCG:  Solving for epsilon, Initial residual = 0.0122775, Final residual = 0.000168175, No Iterations 2
bounding epsilon, min: -5574.49 max: 71373.4 average: 145.518
DILUPBiCG:  Solving for k, Initial residual = 1, Final residual = 0.023163, No Iterations 2
bounding k, min: -147.366 max: 951.351 average: 5.56723
ExecutionTime = 50.28 s  ClockTime = 51 s

Time = 2

smoothSolver:  Solving for Ux, Initial residual = 0.26106, Final residual = 0.00377569, No Iterations 4
smoothSolver:  Solving for Uy, Initial residual = 0.0441241, Final residual = 0.000763274, No Iterations 4
smoothSolver:  Solving for Uz, Initial residual = 0.390185, Final residual = 0.0058094, No Iterations 4
GAMG:  Solving for p, Initial residual = 0.147535, Final residual = 0.0107923, No Iterations 1
time step continuity errors : sum local = 0.053149, global = 0.000500766, cumulative = 0.000436996
DILUPBiCG:  Solving for epsilon, Initial residual = 0.0402059, Final residual = 0.00171671, No Iterations 1
bounding epsilon, min: -121237 max: 5.27191e+06 average: 3535.89
DILUPBiCG:  Solving for k, Initial residual = 0.0747554, Final residual = 0.00241621, No Iterations 2
bounding k, min: -146.836 max: 5643.87 average: 31.7521
ExecutionTime = 78.74 s  ClockTime = 79 s

Time = 3

smoothSolver:  Solving for Ux, Initial residual = 0.247456, Final residual = 0.0206429, No Iterations 2
smoothSolver:  Solving for Uy, Initial residual = 0.0387877, Final residual = 0.0032168, No Iterations 2
smoothSolver:  Solving for Uz, Initial residual = 0.343374, Final residual = 0.024948, No Iterations 2
GAMG:  Solving for p, Initial residual = 0.166044, Final residual = 0.0114922, No Iterations 2
time step continuity errors : sum local = 0.0447917, global = 0.000423066, cumulative = 0.000860062
DILUPBiCG:  Solving for epsilon, Initial residual = 0.0555406, Final residual = 0.00191473, No Iterations 1
bounding epsilon, min: -5.39163e+06 max: 5.54757e+08 average: 71838.7
DILUPBiCG:  Solving for k, Initial residual = 0.0707114, Final residual = 0.00186781, No Iterations 2
bounding k, min: -3189.27 max: 154294 average: 95.4119
ExecutionTime = 106.9 s  ClockTime = 107 s

Time = 4

smoothSolver:  Solving for Ux, Initial residual = 0.192757, Final residual = 0.00805001, No Iterations 2
smoothSolver:  Solving for Uy, Initial residual = 0.0908262, Final residual = 0.00341814, No Iterations 2
smoothSolver:  Solving for Uz, Initial residual = 0.291972, Final residual = 0.011914, No Iterations 2
GAMG:  Solving for p, Initial residual = 0.463544, Final residual = 0.0389622, No Iterations 2
time step continuity errors : sum local = 0.0852108, global = 0.00132486, cumulative = 0.00218492
DILUPBiCG:  Solving for epsilon, Initial residual = 0.0594854, Final residual = 0.000642822, No Iterations 1
bounding epsilon, min: -8.30055e+09 max: 3.0866e+11 average: 4.61978e+06
DILUPBiCG:  Solving for k, Initial residual = 0.338118, Final residual = 0.00675346, No Iterations 1
bounding k, min: -6.38181e+06 max: 5.92471e+07 average: 1001.34
ExecutionTime = 133.67 s  ClockTime = 134 s

Time = 5

smoothSolver:  Solving for Ux, Initial residual = 0.797821, Final residual = 0.0211082, No Iterations 2
smoothSolver:  Solving for Uy, Initial residual = 0.739135, Final residual = 0.0658153, No Iterations 2
smoothSolver:  Solving for Uz, Initial residual = 0.54783, Final residual = 0.0312859, No Iterations 2
GAMG:  Solving for p, Initial residual = 0.424735, Final residual = 0.0249722, No Iterations 2
time step continuity errors : sum local = 7.96186e+10, global = -2.33191e+07, cumulative = -2.33191e+07
DILUPBiCG:  Solving for epsilon, Initial residual = 0.999997, Final residual = 0.0964261, No Iterations 1
bounding epsilon, min: -2.27741e+23 max: 8.88371e+24 average: 4.00346e+19
DILUPBiCG:  Solving for k, Initial residual = 0.999975, Final residual = 0.0152503, No Iterations 1
bounding k, min: -5.98034e+19 max: 4.30253e+20 average: 6.4329e+15
ExecutionTime = 160.39 s  ClockTime = 161 s

Time = 6

smoothSolver:  Solving for Ux, Initial residual = 0.503326, Final residual = 0.0145054, No Iterations 2
smoothSolver:  Solving for Uy, Initial residual = 0.516262, Final residual = 0.0087694, No Iterations 2
smoothSolver:  Solving for Uz, Initial residual = 0.663085, Final residual = 0.0268232, No Iterations 2
GAMG:  Solving for p, Initial residual = 0.992137, Final residual = 9.14002e-05, No Iterations 1
time step continuity errors : sum local = 1.55743e+12, global = 4.00732e+10, cumulative = 4.00499e+10
DILUPBiCG:  Solving for epsilon, Initial residual = 9.499e-09, Final residual = 9.499e-09, No Iterations 0
bounding epsilon, min: 5.95232e-21 max: 2.63588e+31 average: 1.74496e+26
DILUPBiCG:  Solving for k, Initial residual = 1, Final residual = 5.60578e-08, No Iterations 1
bounding k, min: -9.87096e+31 max: 4.69593e+33 average: 1.50957e+29
ExecutionTime = 184.34 s  ClockTime = 185 s

Time = 7

smoothSolver:  Solving for Ux, Initial residual = 0.176609, Final residual = 0.00788783, No Iterations 2
smoothSolver:  Solving for Uy, Initial residual = 0.00488076, Final residual = 6.44686e-05, No Iterations 2
smoothSolver:  Solving for Uz, Initial residual = 0.062501, Final residual = 0.00183637, No Iterations 2
GAMG:  Solving for p, Initial residual = 2.91086e-11, Final residual = 2.91086e-11, No Iterations 0
time step continuity errors : sum local = 7.19548e+23, global = -3.95748e+09, cumulative = 3.60925e+10
DILUPBiCG:  Solving for epsilon, Initial residual = 6.70065e-12, Final residual = 6.70065e-12, No Iterations 0
bounding epsilon, min: 6.75762e-21 max: 1.83829e+46 average: 6.2131e+40
DILUPBiCG:  Solving for k, Initial residual = 0.137207, Final residual = 0.000197093, No Iterations 2
bounding k, min: -1.8125e+40 max: 1.33333e+43 average: 5.85742e+37
ExecutionTime = 208.37 s  ClockTime = 209 s

Time = 8

smoothSolver:  Solving for Ux, Initial residual = 2.84546e-11, Final residual = 2.84546e-11, No Iterations 0
smoothSolver:  Solving for Uy, Initial residual = 3.46671e-09, Final residual = 3.46671e-09, No Iterations 0
smoothSolver:  Solving for Uz, Initial residual = 4.31442e-11, Final residual = 4.31442e-11, No Iterations 0
#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 "/opt/openfoam171/lib/linuxGccDPOpt/libOpenFOAM.so"
#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 "/opt/openfoam171/lib/linuxGccDPOpt/libOpenFOAM.so"
#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 "/opt/openfoam171/lib/linuxGccDPOpt/libOpenFOAM.so"
#6  Foam::GAMGSolver::solve(Foam::Field<double>&, Foam::Field<double> const&, unsigned char) const in "/opt/openfoam171/lib/linuxGccDPOpt/libOpenFOAM.so"
#7  Foam::fvMatrix<double>::solve(Foam::dictionary const&) in "/opt/openfoam171/lib/linuxGccDPOpt/libfiniteVolume.so"
#8  
 in "/opt/openfoam171/applications/bin/linuxGccDPOpt/simpleFoam"
#9  __libc_start_main in "/lib/i386-linux-gnu/libc.so.6"
#10  
 in "/opt/openfoam171/applications/bin/linuxGccDPOpt/simpleFoam"
Floating point exception (core dumped)
--------------------------------------------------------------------------------------------------------------------------

Is it an error from the numerical scheme? I see that there are a large value for bounding epsilon and k. Is here the problem?

The fvScheme file is:

HTML Code:
/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  1.7.1                                 |
|   \\  /    A nd           | Web:      www.OpenFOAM.com                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    location    "system";
    object      fvSchemes;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

ddtSchemes
{
    default         steadyState;
}

gradSchemes
{
    default         Gauss linear;
    grad(p)         Gauss linear;
    grad(U)         Gauss linear;
}

divSchemes
{
    default         none;
    div(phi,U)      Gauss limitedLinear 1;
    div(phi,k)      Gauss limitedLinear 1;
    div(phi,epsilon) Gauss limitedLinear 1;
    div(phi,R)      Gauss limitedLinear 1;
    div(R)          Gauss linear;
    div(phi,nuTilda) Gauss limitedLinear 1;
    div((nuEff*dev(grad(U).T()))) Gauss linear;
}

laplacianSchemes
{
    default         none;
    laplacian(nuEff,U) Gauss linear corrected;
    laplacian((1|A(U)),p) Gauss linear corrected;
    laplacian(DkEff,k) Gauss linear corrected;
    laplacian(DepsilonEff,epsilon) Gauss linear corrected;
    laplacian(DREff,R) Gauss linear corrected;
    laplacian(DnuTildaEff,nuTilda) Gauss linear corrected;
}

interpolationSchemes
{
    default         linear;
    interpolate(U)  linear;
}

snGradSchemes
{
    default         corrected;
}

fluxRequired
{
    default         no;
    p               ;
}

Thanks for the replies.
Best regards.

Mattia
sgnikos likes this.
gara1988 is offline   Reply With Quote

Old   October 24, 2012, 06:28
Default
  #2
New Member
 
Mattia
Join Date: Oct 2012
Location: Milan
Posts: 28
Rep Power: 4
gara1988 is on a distinguished road
When I turn off turbulence in RAS Properties, It goes ok and the time step continuity errors has no large value. The solution, seen by Paraview, seems ok. How can I correct the problem with epsilon and K.

Thanks.
Best regards.
gara1988 is offline   Reply With Quote

Old   November 11, 2012, 11:24
Default
  #3
Member
 
Zifei Yin
Join Date: Sep 2012
Location: Shanghai & Ames
Posts: 33
Rep Power: 4
yzf1215 is on a distinguished road
would you please send your Mesh file and your case file to yzf1215@gmail.com? I'm having a similar problem like you.
yzf1215 is offline   Reply With Quote

Old   November 13, 2012, 06:47
Default
  #4
New Member
 
Mattia
Join Date: Oct 2012
Location: Milan
Posts: 28
Rep Power: 4
gara1988 is on a distinguished road
Hello, I solved the problem. It was in the turbulence model. I imposed Spalart-Allmras or Realizable K-epsilon and the solution now doesn't diverge!
gara1988 is offline   Reply With Quote

Reply

Thread Tools
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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
3-D wing analysis problem arjit FLUENT 14 June 17, 2013 14:39
Problem running simpleFoam on a multi element airfoil vinz OpenFOAM Running, Solving & CFD 18 April 11, 2013 11:26
simpleFoam: problem with the U file samiam1000 OpenFOAM 3 December 17, 2012 07:22
3D wing (flapping elastically) flexing UDF problem djan Fluent UDF and Scheme Programming 3 March 30, 2012 11:37
Solution convergence problem - poor mesh? Shawn_A OpenFOAM Running, Solving & CFD 2 November 12, 2011 20:31


All times are GMT -4. The time now is 18:06.