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Compressor Simulation using rhoPimpleDyMFoam
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Join Date: Jul 2014
Rep Power: 6
I am simulating compressor stage of a turbocharger with the rhoPimpleDyMFoam solver. running moveDynamicMesh -checkAMI
was smooth without any errors which assures that my mesh rotates
properly and i have defined my interfaces correctly , please point out
if i am assuming this wrong.
However running the solver my simulation crashes showing this
/*---------------------------------------------------------------------------*\
| =========
| OpenFOAM: The Open Source CFD Toolbox
O peration
| Version:
www.OpenFOAM.org
M anipulation
\*---------------------------------------------------------------------------*/
: rhoPimpleDyMFoam
: Oct 22 2014
: 15:58:22
: &EAT-Standalone&
: /home/eatin/OpenFOAM/eatin-2.3.0/run/tutorials/TurboCharger/Trial_4
nProcs : 1
sigFpe : Enabling floating point exception trapping (FOAM_SIGFPE).
fileModificationChecking : Monitoring run-time modified files using timeStampMaster
allowSystemOperations : Disallowing user-supplied system call operations
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Create time
Create mesh for time = 0
Selecting dynamicFvMesh solidBodyMotionFvMesh
Selecting solid-body motion function rotatingMotion
Applying solid body motion to cellZone FLUID_ROTOR
PIMPLE: Operating solver in PISO mode
Reading thermophysical properties
Selecting thermodynamics package
equationOfState perfectG
AMI: Creating addressing and weights between 1900 source faces and 32076 target faces
AMI: Patch source sum(weights) min/max/average = 0., 0.999764
AMI: Patch target sum(weights) min/max/average = 0., 0.996788
AMI: Creating addressing and weights between 17748 source faces and 5456 target faces
AMI: Patch source sum(weights) min/max/average = 0..009
AMI: Patch target sum(weights) min/max/average = 0..0924
AMI: Creating addressing and weights between 17839 source faces and 1957 target faces
AMI: Patch source sum(weights) min/max/average = 0.8.999108
AMI: Patch target sum(weights) min/max/average = 0., 0.99992
Reading field U
Reading/calculating face flux field phi
Creating turbulence model
Selecting turbulence model type RASModel
Selecting RAS turbulence model kEpsilon
Foam::error::printStack(Foam::Ostream&) in &/home/eatin/OpenFOAM/OpenFOAM-2.3.0/platforms/linux64GccDPOpt/lib/libOpenFOAM.so&
Foam::sigFpe::sigHandler(int) in &/home/eatin/OpenFOAM/OpenFOAM-2.3.0/platforms/linux64GccDPOpt/lib/libOpenFOAM.so&
in &/lib/x86_64-linux-gnu/libc.so.6&
Foam::compressible::mutkWallFunctionFvPatchScalarField::calcMut() const in &/home/eatin/OpenFOAM/OpenFOAM-2.3.0/platforms/linux64GccDPOpt/lib/libcompressibleRASModels.so&
Foam::compressible::mutWallFunctionFvPatchScalarField::updateCoeffs() in &/home/eatin/OpenFOAM/OpenFOAM-2.3.0/platforms/linux64GccDPOpt/lib/libcompressibleRASModels.so&
Foam::fvPatchField&double&::evaluate(Foam::UPstream::commsTypes) in &/home/eatin/OpenFOAM/OpenFOAM-2.3.0/platforms/linux64GccDPOpt/bin/rhoPimpleDyMFoam&
Foam::GeometricField&double, Foam::fvPatchField, Foam::volMesh&::GeometricBoundaryField::evaluate() in &/home/eatin/OpenFOAM/OpenFOAM-2.3.0/platforms/linux64GccDPOpt/bin/rhoPimpleDyMFoam&
Foam::compressible::RASModels::kEpsilon::kEpsilon(Foam::GeometricField&double, Foam::fvPatchField, Foam::volMesh& const&, Foam::GeometricField&Foam::Vector&double&, Foam::fvPatchField, Foam::volMesh& const&, Foam::GeometricField&double, Foam::fvsPatchField, Foam::surfaceMesh& const&, Foam::fluidThermo const&, Foam::word const&, Foam::word const&) in &/home/eatin/OpenFOAM/OpenFOAM-2.3.0/platforms/linux64GccDPOpt/lib/libcompressibleRASModels.so&
Foam::compressible::RASModel::adddictionaryConstructorToTable&Foam::compressible::RASModels::kEpsilon&::New(Foam::GeometricField&double, Foam::fvPatchField, Foam::volMesh& const&, Foam::GeometricField&Foam::Vector&double&, Foam::fvPatchField, Foam::volMesh& const&, Foam::GeometricField&double, Foam::fvsPatchField, Foam::surfaceMesh& const&, Foam::fluidThermo const&, Foam::word const&) in &/home/eatin/OpenFOAM/OpenFOAM-2.3.0/platforms/linux64GccDPOpt/lib/libcompressibleRASModels.so&
Foam::compressible::RASModel::New(Foam::GeometricField&double, Foam::fvPatchField, Foam::volMesh& const&, Foam::GeometricField&Foam::Vector&double&, Foam::fvPatchField, Foam::volMesh& const&, Foam::GeometricField&double, Foam::fvsPatchField, Foam::surfaceMesh& const&, Foam::fluidThermo const&, Foam::word const&) in &/home/eatin/OpenFOAM/OpenFOAM-2.3.0/platforms/linux64GccDPOpt/lib/libcompressibleRASModels.so&
Foam::compressible::turbulenceModel::addturbulenceModelConstructorToTable&Foam::compressible::RASModel&::NewturbulenceModel(Foam::GeometricField&double, Foam::fvPatchField, Foam::volMesh& const&, Foam::GeometricField&Foam::Vector&double&, Foam::fvPatchField, Foam::volMesh& const&, Foam::GeometricField&double, Foam::fvsPatchField, Foam::surfaceMesh& const&, Foam::fluidThermo const&, Foam::word const&) in &/home/eatin/OpenFOAM/OpenFOAM-2.3.0/platforms/linux64GccDPOpt/lib/libcompressibleRASModels.so&
Foam::compressible::turbulenceModel::New(Foam::GeometricField&double, Foam::fvPatchField, Foam::volMesh& const&, Foam::GeometricField&Foam::Vector&double&, Foam::fvPatchField, Foam::volMesh& const&, Foam::GeometricField&double, Foam::fvsPatchField, Foam::surfaceMesh& const&, Foam::fluidThermo const&, Foam::word const&) in &/home/eatin/OpenFOAM/OpenFOAM-2.3.0/platforms/linux64GccDPOpt/lib/libcompressibleTurbulenceModel.so&
in &/home/eatin/OpenFOAM/OpenFOAM-2.3.0/platforms/linux64GccDPOpt/bin/rhoPimpleDyMFoam&
__libc_start_main in &/lib/x86_64-linux-gnu/libc.so.6&
in &/home/eatin/OpenFOAM/OpenFOAM-2.3.0/platforms/linux64GccDPOpt/bin/rhoPimpleDyMFoam&
Floating point exception (core dumped)
I am not able to identify what exactly is the problem and i suppose this is not due to the AMI interfaces as moveDynamicMesh
was running perfectly. I have understood after reading few threads that
it might be related to my boundary conditions, fvSchemes or fvSolution
but i have no idea how to correct this. Please help me solve this and
let me know if you need anymore details regarding my simulation.
Join Date: Jul 2014
Rep Power: 6
Coming to my simulation i have to simulate compressor stage of a turbocharger
Meshing was done using ANSYS ICEM CFD , i had 3 mesh files
1. Inlet&Outlet
I imported them to openfoam using fluent3DMeshToFoam and then used mergeMeshes to make the complete domain, after that used
splitMeshRegions -makeCellZones -overwrite to distinguish between the rotating zone and stationary zone.
I am attaching few pictures of the domain so you could get a clear picture.Please have a look at them
Join Date: Jul 2014
Rep Power: 6
This is the complete domain of my simulation
Attached Images
(39.2 KB, 101 views)
Senior Member
Paritosh Vasava
Join Date: Oct 2012
Location: Lappeenranta, Finland
Posts: 733
Rep Power: 16
1. How are you merging your three meshes that you have imported from fluent?
2. How did you create AMI patches?
3. Do you have 'sets' folder (with several domains) inside the constant folder?
Join Date: Jul 2014
Rep Power: 6
As i have 3 mesh files
1.I created 3 case folders 1.Rotor 2.Volute 3.Inlet_Outlet
2. Placed the 3 mesh files into corresponding case folders and used fluent3DMeshToFoam fluent.msh -scale 0.001
for each to convert to meters
3.merged Rotor and volute , and then merged the combined mesh with Inlet_Outlet
4.used splitMeshRegions -makeCellZones -overwrite to create cell zones of different regions , 3 in my case
To create the AMI patches i used the createPatchDict, I will attach it for your reference
/*--------------------------------*- C++ -*----------------------------------*\
| =========
| OpenFOAM: The Open Source CFD Toolbox
O peration
| Version:
www.OpenFOAM.org
M anipulation
\*---------------------------------------------------------------------------*/
createPatchD
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
// Do a synchronisation of coupled points after creation of any patches.
// Note: this does not work with points that are on multiple coupled patches
with transformations (i.e. cyclics).
// Patches to create.
//- Master side patch
cyclicAMI;
matchTolerance
neighbourPatch
constructF
patches (INT_STA_ROT_master);
//- Slave side patch
cyclicAMI;
matchTolerance
neighbourPatch
constructF
patches (INT_STA_ROT_slave);
//- Master side patch
cyclicAMI;
matchTolerance
neighbourPatch
constructF
patches (INT_ROT_STA_master);
//- Slave side patch
cyclicAMI;
matchTolerance
neighbourPatch
constructF
patches (INT_ROT_STA_slave);
//- Master side patch
cyclicAMI;
matchTolerance
neighbourPatch
constructF
patches (INT_OUTLET_HOUSING_master);
//- Slave side patch
cyclicAMI;
matchTolerance
neighbourPatch
constructF
patches (INT_OUTLET_HOUSING_slave);
Yes, i have sets in my constant folder with different domains
Senior Member
Tom Fahner
Join Date: Mar 2009
Location: Breda, Netherlands
Posts: 469
Rep Power: 16
Your problem seems to be in the turbulence model, I am guessing you have put epsilon equal to zero somewhere in either a boundary patch or the internalField. Change this to a sensible value for your case.
Senior Member
Paritosh Vasava
Join Date: Oct 2012
Location: Lappeenranta, Finland
Posts: 733
Rep Power: 16
Your mesh setup seems alright. I agree with tomf, get some appropriate values for turbulence and use them in initial condition.
Also can you post your boundary file here?
Join Date: Jul 2014
Rep Power: 6
Sorry for the late reply and thanks for your response
I have checked my epsilon file and have not put zero anywhere and ya as you have suggested i am working on my initial and boundary conditions as this might be the source of error.
Here is my boundary file
polyBoundaryM
&constant/polyMesh&;
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
WALL_BACK_PLATE_ROT
WALL_SHOURD
WALL_BLADE
WALL_HOUSING
WALL_BACK_PLATE_STA
WALL_FREESLIP_INLET
WALL_FREESLIP_OUTLET
cyclicAMI;
1(cyclicAMI);
matchTolerance
neighbourPatch
cyclicAMI;
1(cyclicAMI);
matchTolerance
neighbourPatch
cyclicAMI;
1(cyclicAMI);
matchTolerance
neighbourPatch
cyclicAMI;
1(cyclicAMI);
matchTolerance
neighbourPatch
cyclicAMI;
1(cyclicAMI);
matchTolerance
neighbourPatch
cyclicAMI;
1(cyclicAMI);
matchTolerance
neighbourPatch
// ************************************************************************* //
One question , I have many boundaries i.e 16 in my boundary file. Is it necessary to define initial and boundary conditions for all these in my 0 folder?
Senior Member
Paritosh Vasava
Join Date: Oct 2012
Location: Lappeenranta, Finland
Posts: 733
Rep Power: 16
Originally Posted by Jetfire
One question , I have many boundaries i.e 16 in my boundary file. Is it necessary to define initial and boundary conditions for all these in my 0 folder?
Yes you have to else openFoam will complain even before your calculation starts.
The boundary file looks ok but did you try any other turbulence setup??
Join Date: Jul 2014
Rep Power: 6
Hi vasava,
Do you mean any of these two? I started with K-Epsilon as it was the basic turbulence model to start with.
1.K-omega SST
2.Spalart-Allmaras
I am attaching my 0 folder , please take a look at my initial and boundary conditions and help me correct them. I have copied and modified the files from annularThermalMixer tutorial.
Attached Files
(1.7 KB, 25 views)
Senior Member
Tom Fahner
Join Date: Mar 2009
Location: Breda, Netherlands
Posts: 469
Rep Power: 16
You have provided a relative pressure of 0 Pa, you should put the absolute pressure. OpenFOAM does not use a &gauge pressure& or similar for compressible solvers. The solver now tried to solve for an absolute vacuum, which it could not do. I guess it only found out when density was required to calculated some part of the turbulence model.
For incompressible cases 0 m2/s2 is allowed since in that case the absolute pressure does not matter.
likes this.
Join Date: Jul 2014
Rep Power: 6
Originally Posted by tomf
You have provided a relative pressure of 0 Pa, you should put the absolute pressure. OpenFOAM does not use a &gauge pressure& or similar for compressible solvers. The solver now tried to solve for an absolute vacuum, which it could not do. I guess it only found out when density was required to calculated some part of the turbulence model.
For incompressible cases 0 m2/s2 is allowed since in that case the absolute pressure does not matter.
I changed the pressure file as suggested by you creating a pressure difference between inlet and outlet but i still end up getting the same error .
Alexeym has suggested this might be the cause of my error:
as you've got FPE in mutkWallFunctionFvPatchScalarField::calcMut(), look at the source of the wall function:
tmp&scalarField& mutkWallFunctionFvPatchScalarField::calcMut() const
const label patchi = patch().index();
const turbulenceModel& turbModel =
db().lookupObject&turbulenceModel&(&turbulenceModel&);
const scalarField& y = turbModel.y()[patchi];
const scalarField& rhow = turbModel.rho().boundaryField()[patchi];
const tmp&volScalarField& tk = turbModel.k();
const volScalarField& k = tk();
const scalarField& muw = turbModel.mu().boundaryField()[patchi];
const scalar Cmu25 = pow025(Cmu_);
tmp&scalarField& tmutw(new scalarField(patch().size(), 0.0));
scalarField& mutw = tmutw();
forAll(mutw, faceI)
label faceCellI = patch().faceCells()[faceI];
scalar yPlus =
Cmu25*y[faceI]*sqrt(k[faceCellI])/(muw[faceI]/rhow[faceI]);
if (yPlus & yPlusLam_)
mutw[faceI] = muw[faceI]*(yPlus*kappa_/log(E_*yPlus) - 1);
There's several possible reasons for FPE:
1. rhow[faceI] == 0
2. muw[faceI] == 0
3. k[faceCellI] & 0
4. E_*yPlus &= 0 (this is not the case, cause yPlus & yPlusLam_)
So you need to check if any of conditions 1-3 is true in your case.
I am able to figure out that these conditions come from the equations to have a proper solution but unable to understand which values i should correct.Please explain me if you can interpret what the problem exactly is.
Senior Member
Tom Fahner
Join Date: Mar 2009
Location: Breda, Netherlands
Posts: 469
Rep Power: 16
Could you just show the p file, I was not talking about a pressure difference between inlet and outlet, I meant that you cannot have 0 Pa anywhere in the domain (internalField or any boundary condition), it should be around your absolute operating pressure (101325 Pa for standard atmosphere conditions).
I guess it should look something like this:
/*--------------------------------*- C++ -*----------------------------------*\
| =========
| OpenFOAM: The Open Source CFD Toolbox
O peration
| Version:
www.OpenFOAM.org
M anipulation
\*---------------------------------------------------------------------------*/
volScalarF
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
dimensions
[1 -1 -2 0 0 0 0];
internalField
uniform 101325;
boundaryField
uniform 101325;
WALL_BACK_PLATE_ROT
WALL_SHOURD
WALL_BACK_PLATE_STA
WALL_BLADE
WALL_HOUSING
WALL_FREESLIP_INLET
WALL_FREESLIP_OUTLET
cyclicAMI;
uniform 101325;
cyclicAMI;
uniform 101325;
cyclicAMI;
uniform 101325;
cyclicAMI;
uniform 101325;
cyclicAMI;
uniform 101325;
cyclicAMI;
uniform 101325;
// ************************************************************************* //
Join Date: Jul 2014
Rep Power: 6
Thank you very much.
Just changed my p-file as suggested by you, now my simulation started running!!
I was always worried about the mut-file , dint expect the error was in my p-file.
For now the simulation is running but too slow,have to run it in parallel and maybe some changes in my fvSchemes and fvSolution will do. il come back to you in case of any queries, thanks a lot!
Join Date: Jul 2014
Rep Power: 6
I am simulating compressor of a turbocharger using rhoPimpleDyMFoam with kOmegaSST turbulence model.
Boundary conditons are as follows:
mass flow outlet : 0.04 kg/s
total pressure inlet:101325
total temperature inlet:298k
compressor rpm: 300,000
Can you help me with my FvSchemes and FvSolutions as to what modifications i should be doing for better results. let me know if you need any more details about the simulation.
/*--------------------------------*- C++ -*----------------------------------*\
| =========
| OpenFOAM: The Open Source CFD Toolbox
O peration
| Version:
www.OpenFOAM.org
M anipulation
\*---------------------------------------------------------------------------*/
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
ddtSchemes
gradSchemes
divSchemes
div(phi,U)
Gauss linearUpwind grad(U);
div(phi,h)
Gauss linearUpwind grad(h);
div(phi,K)
div(meshPhi,p)
div(phi,k)
div(phi,omega) G
div((muEff*dev2(T(grad(U))))) G
laplacianSchemes
interpolationSchemes
snGradSchemes
fluxRequired
// ************************************************************************* //
FvSolution
/*--------------------------------*- C++ -*----------------------------------*\
| =========
| OpenFOAM: The Open Source CFD Toolbox
O peration
| Version:
www.OpenFOAM.org
M anipulation
\*---------------------------------------------------------------------------*/
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
agglomerator
nCellsInCoarsestLevel 10;
mergeLevels
&(rho|U|h|k|epsilon|omega)&
&(rho|U|h|k|epsilon|omega)Final&
nOuterCorrectors
nCorrectors
nNonOrthogonalCorrectors 1;
rhoMin [ 1 -3 0 0 0 ] 0.5;
rhoMax [ 1 -3 0 0 0 ] 2.0;
relaxationFactors
&(U|h|k|epsilon|omega).*& 1;
// ************************************************************************* //
Senior Member
Join Date: Jun 2011
Location: Germany
Posts: 1,297
Rep Power: 21
Whats the matter with your current results? Any problems?
__________________
The skeleton ran out of shampoo in the shower.
Join Date: Jul 2014
Rep Power: 6
Hi RodriguezFatz,
I have started running the simulation and each timestep is taking a lot of time. Is there anything to do with my FvSolution or FvSchemes files to speed up my simulation? I am already running it on 8 cores.
Super Moderator
Dr. mont. Tobias Holzmann
Join Date: Oct 2010
Location: Leoben (Austria)
Posts: 2,060
Blog Entries:
Rep Power: 36
So at least there is no problem ...
__________________
Keep foaming,
Tobias Holzmann
Join Date: Jul 2014
Rep Power: 6
My simulation has been running from past 1 day and still going on
Here is the output
Courant Number mean: 0. max: 1
deltaT = 1.41799e-09
Time = 5.81839e-07
solidBodyMotionFunctions::rotatingMotion::transformation(): Time = 5.81839e-07 transformation: ((0 0 0) (0.. 0)))
AMI: Creating addressing and weights between 1900 source faces and 32076 target faces
AMI: Patch source sum(weights) min/max/average = 0.9.999763
AMI: Patch target sum(weights) min/max/average = 0., 0.996805
AMI: Creating addressing and weights between 17748 source faces and 5456 target faces
AMI: Patch source sum(weights) min/max/average = 0..015
AMI: Patch target sum(weights) min/max/average = 0..0864
AMI: Creating addressing and weights between 17839 source faces and 1957 target faces
AMI: Patch source sum(weights) min/max/average = 0.8.999108
AMI: Patch target sum(weights) min/max/average = 0., 0.99992
Solving for pcorr, Initial residual = 1, Final residual = 0., No Iterations 47
Solving for pcorr, Initial residual = 0.0244185, Final residual = 0., No Iterations 1
Solving for rho, Initial residual = 0, Final residual = 0, No Iterations 0
rhoEqn max/min : 2.153
smoothSolver:
Solving for Ux, Initial residual = 3.26172e-05, Final residual = 2.14196e-09, No Iterations 1
smoothSolver:
Solving for Uy, Initial residual = 0., Final residual = 1.29594e-07, No Iterations 1
smoothSolver:
Solving for Uz, Initial residual = 0., Final residual = 1.35932e-07, No Iterations 1
smoothSolver:
Solving for h, Initial residual = 0., Final residual = 7.49315e-08, No Iterations 1
Solving for p, Initial residual = 7.71888e-05, Final residual = 3.25475e-13, No Iterations 1
Solving for p, Initial residual = 1.49854e-09, Final residual = 1.49854e-09, No Iterations 0
Solving for rho, Initial residual = 0, Final residual = 0, No Iterations 0
time step continuity errors : sum local = 0., global = -0., cumulative = -0.0697627
rho max/min : 2 0.5
Solving for p, Initial residual = 1.52653e-07, Final residual = 1.52653e-07, No Iterations 0
Solving for p, Initial residual = 1.52653e-07, Final residual = 1.52653e-07, No Iterations 0
Solving for rho, Initial residual = 0, Final residual = 0, No Iterations 0
time step continuity errors : sum local = 0., global = -0., cumulative = -0.0698923
rho max/min : 2 0.5
Solving for p, Initial residual = 1.52573e-07, Final residual = 1.52573e-07, No Iterations 0
Solving for p, Initial residual = 1.52573e-07, Final residual = 1.52573e-07, No Iterations 0
Solving for rho, Initial residual = 0, Final residual = 0, No Iterations 0
time step continuity errors : sum local = 0., global = -0., cumulative = -0.0700219
rho max/min : 2 0.5
smoothSolver:
Solving for omega, Initial residual = 2.31798e-06, Final residual = 1.30867e-10, No Iterations 1
bounding omega, min: -6301.47 max: 5.70133e+09 average: 2.17771e+06
smoothSolver:
Solving for k, Initial residual = 2.69839e-05, Final residual = 1.04992e-09, No Iterations 1
ExecutionTime = 62085.4 s
ClockTime = 83417 s
Courant Number mean: 0. max: 1
deltaT = 1.41799e-09
Time = 5.83257e-07
solidBodyMotionFunctions::rotatingMotion::transformation(): Time = 5.83257e-07 transformation: ((0 0 0) (0.. 0)))
AMI: Creating addressing and weights between 1900 source faces and 32076 target faces
AMI: Patch source sum(weights) min/max/average = 0., 0.999763
AMI: Patch target sum(weights) min/max/average = 0., 0.996805
AMI: Creating addressing and weights between 17748 source faces and 5456 target faces
AMI: Patch source sum(weights) min/max/average = 0..015
AMI: Patch target sum(weights) min/max/average = 0..0863
AMI: Creating addressing and weights between 17839 source faces and 1957 target faces
AMI: Patch source sum(weights) min/max/average = 0.8.999108
AMI: Patch target sum(weights) min/max/average = 0., 0.99992
Solving for pcorr, Initial residual = 1, Final residual = 0., No Iterations 49
Solving for pcorr, Initial residual = 0.0244148, Final residual = 0., No Iterations 1
Solving for rho, Initial residual = 0, Final residual = 0, No Iterations 0
rhoEqn max/min : 2.2
smoothSolver:
Solving for Ux, Initial residual = 3.25967e-05, Final residual = 2.1407e-09, No Iterations 1
smoothSolver:
Solving for Uy, Initial residual = 0., Final residual = 1.29333e-07, No Iterations 1
smoothSolver:
Solving for Uz, Initial residual = 0., Final residual = 1.35799e-07, No Iterations 1
smoothSolver:
Solving for h, Initial residual = 0., Final residual = 7.35108e-08, No Iterations 1
Solving for p, Initial residual = 7.69707e-05, Final residual = 3.22893e-13, No Iterations 1
Solving for p, Initial residual = 1.49221e-09, Final residual = 1.49221e-09, No Iterations 0
Solving for rho, Initial residual = 0, Final residual = 0, No Iterations 0
time step continuity errors : sum local = 0., global = -0., cumulative = -0.0701519
rho max/min : 2 0.5
Solving for p, Initial residual = 1.51827e-07, Final residual = 1.51827e-07, No Iterations 0
Solving for p, Initial residual = 1.51827e-07, Final residual = 1.51827e-07, No Iterations 0
Solving for rho, Initial residual = 0, Final residual = 0, No Iterations 0
time step continuity errors : sum local = 0., global = -0., cumulative = -0.0702819
rho max/min : 2 0.5
Solving for p, Initial residual = 1.51748e-07, Final residual = 1.51748e-07, No Iterations 0
Solving for p, Initial residual = 1.51748e-07, Final residual = 1.51748e-07, No Iterations 0
Solving for rho, Initial residual = 0, Final residual = 0, No Iterations 0
time step continuity errors : sum local = 0., global = -0., cumulative = -0.0704119
rho max/min : 2 0.5
smoothSolver:
Solving for omega, Initial residual = 2.31335e-06, Final residual = 1.3162e-10, No Iterations 1
bounding omega, min: -3196.96 max: 5.70337e+09 average: 2.17777e+06
smoothSolver:
Solving for k, Initial residual = 2.69244e-05, Final residual = 1.05185e-09, No Iterations 1
ExecutionTime = 62226.4 s
ClockTime = 83606 s
Courant Number mean: 0. max: 1
deltaT = 1.41798e-09
Time = 5.84675e-07
solidBodyMotionFunctions::rotatingMotion::transformation(): Time = 5.84675e-07 transformation: ((0 0 0) (0.. 0)))
AMI: Creating addressing and weights between 1900 source faces and 32076 target faces
AMI: Patch source sum(weights) min/max/average = 0., 0.999763
AMI: Patch target sum(weights) min/max/average = 0., 0.996805
AMI: Creating addressing and weights between 17748 source faces and 5456 target faces
AMI: Patch source sum(weights) min/max/average = 0..015
AMI: Patch target sum(weights) min/max/average = 0..0883
AMI: Creating addressing and weights between 17839 source faces and 1957 target faces
AMI: Patch source sum(weights) min/max/average = 0.8.999108
AMI: Patch target sum(weights) min/max/average = 0., 0.99992
Do i need to change solver for pressure and modify the tolerances. Please suggest
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Dr. mont. Tobias Holzmann
Join Date: Oct 2010
Location: Leoben (Austria)
Posts: 2,060
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my simulations are running on 40 cores 2 weeks ...
But you time step is very small and your density is wrong (I think)
rho max/min : 2 0.5
you make something wrong.
I dont know what because you do not share many details. You should check out you time steps... maybe your pressure, velocity, k, epsilon are expoding. As I can see, you should use the correct form of the PIMPLE algorithm. Maybe it will be stabilized. Checkout my blog or also available at the wiki.
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Tobias Holzmann
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