| OpenFOOL |
May 11, 2020 07:27 |
Pressure driven flow with rhoSimpleFoam Error
1 Attachment(s)
Hi folks,
I am still a bloody beginner and I think I need some help of you. Currently I am facing problems with a rhoSimpleFoam case. The simulation won't run (sigFpe after a few iterations) and I am quiet sure that I made some basic mistakes, but I can't find them. Originally the geometry is a bit more complex, but to make things not more complicated than necessary I made a simple case. In the end I want to simulate the transient case with turbulence and in parallel, for now just laminar and on a single core.
It's a simple pressure driven flow of nitrogen at 293K with a total pressure of 1113mBar at the inlet and a static pressure of 1013mBar (atmosphere) at the outlet. Now I want to know the velocity field behind the capillary. (see attached picture)
CheckMesh outputs just one fail:
Code:
***Concave cells (using face planes) found, number of cells: 30
The error message output: (I used the limitTemperature option, because I got negative initial temperatures)
Code:
/*---------------------------------------------------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 5.0 |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
Build : 5.0
Exec : rhoSimpleFoam
Date : May 11 2020
Time : 13:10:09
Host : "o2.box"
PID : 8473
I/O : uncollated
Case : /home/leon/OpenFOAM/leon-5.0/run/CapillaryHead_Reduced_CFDONLINE
nProcs : 1
sigFpe : Enabling floating point exception trapping (FOAM_SIGFPE).
fileModificationChecking : Monitoring run-time modified files using timeStampMaster (fileModificationSkew 10)
allowSystemOperations : Allowing user-supplied system call operations
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Create time
Create mesh for time = 0
SIMPLE: convergence criteria
field p tolerance 0.001
field U tolerance 1e-05
field h tolerance 0.0001
Reading thermophysical properties
Selecting thermodynamics package
{
type hePsiThermo;
mixture pureMixture;
transport const;
thermo hConst;
equationOfState perfectGas;
specie specie;
energy sensibleEnthalpy;
}
Reading field U
Reading/calculating face flux field phi
Creating turbulence model
Selecting turbulence model type laminar
Selecting laminar stress model Stokes
No MRF models present
Creating finite volume options from "constant/fvOptions"
Selecting finite volume options model type limitTemperature
Source: limitT
- selecting all cells
- selected 1062441 cell(s) with volume 2.90662e-06
Starting time loop
Time = 1e-06
smoothSolver: Solving for Ux, Initial residual = 1, Final residual = 0.0739827, No Iterations 1
smoothSolver: Solving for Uy, Initial residual = 1, Final residual = 0.0777189, No Iterations 2
smoothSolver: Solving for Uz, Initial residual = 1, Final residual = 0.0755014, No Iterations 1
smoothSolver: Solving for h, Initial residual = 0.512191, Final residual = 0.52304, No Iterations 1000
GAMG: Solving for p, Initial residual = 1, Final residual = 0.00624987, No Iterations 4
GAMG: Solving for p, Initial residual = 0.00244342, Final residual = 1.55703e-05, No Iterations 4
time step continuity errors : sum local = 4.17756e-05, global = -7.39803e-06, cumulative = -7.39803e-06
ExecutionTime = 41.59 s ClockTime = 41 s
Time = 2e-06
smoothSolver: Solving for Ux, Initial residual = 0.116653, Final residual = 0.0102574, No Iterations 1
smoothSolver: Solving for Uy, Initial residual = 0.164785, Final residual = 0.0162303, No Iterations 1
smoothSolver: Solving for Uz, Initial residual = 0.116716, Final residual = 0.0103955, No Iterations 1
smoothSolver: Solving for h, Initial residual = 1, Final residual = 0.0105551, No Iterations 1
GAMG: Solving for p, Initial residual = 0.919701, Final residual = 0.00886947, No Iterations 5
GAMG: Solving for p, Initial residual = 8.3929e-06, Final residual = 6.02233e-07, No Iterations 2
time step continuity errors : sum local = 0.0203171, global = -0.00860199, cumulative = -0.00860938
ExecutionTime = 43.7 s ClockTime = 43 s
Time = 3e-06
smoothSolver: Solving for Ux, Initial residual = 0.140316, Final residual = 0.00638256, No Iterations 1
smoothSolver: Solving for Uy, Initial residual = 0.126721, Final residual = 0.0102169, No Iterations 1
smoothSolver: Solving for Uz, Initial residual = 0.13993, Final residual = 0.00640871, No Iterations 1
smoothSolver: Solving for h, Initial residual = 0.996934, Final residual = 0.0110586, No Iterations 1
#0 Foam::error::printStack(Foam::Ostream&) at ??:?
#1 Foam::sigFpe::sigHandler(int) at ??:?
#2 ? in "/lib64/libc.so.6"
#3 Foam::GAMGSolver::scale(Foam::Field<double>&, Foam::Field<double>&, Foam::lduMatrix const&, Foam::FieldField<Foam::Field, double> const&, Foam::UPtrList<Foam::lduInterfaceField const> const&, Foam::Field<double> const&, unsigned char) const at ??:?
#4 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::Field<double>&, Foam::Field<double>&, Foam::PtrList<Foam::Field<double> >&, Foam::PtrList<Foam::Field<double> >&, unsigned char) const at ??:?
#5 Foam::GAMGSolver::solve(Foam::Field<double>&, Foam::Field<double> const&, unsigned char) const at ??:?
#6 Foam::fvMatrix<double>::solveSegregated(Foam::dictionary const&) at ??:?
#7 Foam::fvMatrix<double>::solve(Foam::dictionary const&) at ??:?
#8 Foam::fvMatrix<double>::solve() at ??:?
#9 ? at ??:?
#10 __libc_start_main in "/lib64/libc.so.6"
#11 ? at /home/abuild/rpmbuild/BUILD/glibc-2.26/csu/../sysdeps/x86_64/start.S:122
Floating point exception (core dumped)
My pressure boundary conditions are as follows:
Code:
FoamFile
{
version 2.0;
format ascii;
class volScalarField;
object p;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
dimensions [1 -1 -2 0 0 0 0];
internalField uniform 101325;
boundaryField
{
CylIn
{
type zeroGradient;
}
Cone
{
type zeroGradient;
}
ConeIn
{
type zeroGradient;
}
CylInCone
{
type zeroGradient;
}
CylOutCone
{
type zeroGradient;
}
HeadWalls
{
type zeroGradient;
}
ShotWall
{
type zeroGradient;
}
Inlet
{
type totalPressure;
p0 uniform 111325;
gamma 1;
value uniform 111325;
}
Outlet
{
type fixedValue;
value uniform 101325;
}
}
My velocity BCs look like this:
Code:
FoamFile
{
version 2.0;
format ascii;
class volVectorField;
object U;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
dimensions [0 1 -1 0 0 0 0];
internalField uniform (0 0 0);
boundaryField
{
CylIn
{
type noSlip;
}
Cone
{
type noSlip;
}
ConeIn
{
type noSlip;
}
CylInCone
{
type noSlip;
}
CylOutCone
{
type noSlip;
}
HeadWalls
{
type noSlip;
}
ShotWall
{
type noSlip;
}
Inlet
{
type pressureInletOutletVelocity;
value uniform (0 0 0);
}
Outlet
{
type inletOutlet;
value $internalField;
inletValue uniform (0 0 0);
}
}
My temperature BCs:
Code:
FoamFile
{
version 2.0;
format ascii;
class volScalarField;
object T;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
dimensions [0 0 0 1 0 0 0];
internalField uniform 293;
boundaryField
{
CylIn
{
type zeroGradient;
}
Cone
{
type zeroGradient;
}
ConeIn
{
type zeroGradient;
}
CylInCone
{
type zeroGradient;
}
CylOutCone
{
type zeroGradient;
}
HeadWalls
{
type zeroGradient;
}
ShotWall
{
type zeroGradient;
}
Inlet
{
type fixedValue;
value uniform 293;
}
Outlet
{
type inletOutlet;
value $internalField;
inletValue $internalField;
}
}
My thermophysicalProperties:
Code:
FoamFile
{
version 2.0;
format ascii;
class dictionary;
location "constant";
object thermophysicalProperties;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
thermoType
{
type hePsiThermo;
mixture pureMixture;
transport const;
thermo hConst;
equationOfState perfectGas;
specie specie;
energy sensibleEnthalpy;
}
mixture
{
specie
{
molWeight 28.013;
}
thermodynamics
{
Cp 1040;
//Hf 22e-6;
Hf 0;
}
transport
{
mu 17.58e-06;
Pr 0.8;
}
}
Anything completely wrong with those settings?
Maybe it's my fvSchemes or fvSolution file? I have to admit with those settings I am most unsecure. Currently I am trying to get more knowledge about them, but it's quiet hard.
Code:
FoamFile
{
version 2.0;
format ascii;
class dictionary;
location "system";
object fvSchemes;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
ddtSchemes
{
default steadyState;
}
gradSchemes
{
default Gauss linear;
}
divSchemes
{
default Gauss linear;
}
laplacianSchemes
{
default Gauss linear corrected;
}
interpolationSchemes
{
default linear;
}
snGradSchemes
{
default corrected;
}
And fvSolution:
Code:
FoamFile
{
version 2.0;
format ascii;
class dictionary;
location "system";
object fvSolution;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
solvers
{
p
{
solver GAMG;
tolerance 1e-06;
relTol 0.01;
smoother GaussSeidel;
nPreSweeps 0;
nPostSweeps 2;
cacheAgglomeration on;
agglomerator faceAreaPair;
nCellsInCoarsestLevel 10;
mergeLevels 1;
}
pFinal
{
$p;
relTol 0;
}
"(rho|U|h)"
{
solver smoothSolver;
smoother symGaussSeidel;
tolerance 1e-05;
relTol 0.1;
}
"(rho|U|h)Final"
{
$U;
tolerance 1e-05;
relTol 0;
}
}
SIMPLE
{
nNonOrthogonalCorrectors 1;
residualControl
{
p 1e-3;
U 1e-5;
h 1e-4;
}
}
relaxationFactors
{
fields
{
p 0.1;
}
equations
{
U 0.7;
h 0.2;
}
}
Could you please give me a hint or lead me in the right direction? I would really appreciate it, because I'm quiet desperate.
Best regards
Leon |
