| Yuval |
September 5, 2014 10:24 |
[rhoCentralFoam] simulating compressible inviscid flow
Hi,
I'm trying to simulate a compressible inviscid flow through a de-laval nozzle into vacuum.
Later I will want to add viscosity to the simulation but for now I want to get inviscid results.
For that purpose I tried setting the thermophysicalProperties dictionary with a janaf model to have Cp changed with temperature and since janaf model has to to go with sutherland's model for transport, and since I want an invscid flow, I set As=Ts=0 to have zero viscosity. Here is my file:
Code:
/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 2.3.0 |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class dictionary;
location "constant";
object thermophysicalProperties;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
thermoType
{
type hePsiThermo;
mixture pureMixture;
transport sutherland; /*const;*/
thermo janaf; /*hConst;*/
equationOfState perfectGas;
specie specie;
energy sensibleInternalEnergy;
}
mixture
//H2O
{
specie
{
nMoles 1;
molWeight 18.0153;
}
thermodynamics //from http://www2.galcit.caltech.edu/EDL/public/thermo/nasadat
{
Tlow 200;
Thigh 6000;
Tcommon 1000;
highCpCoeffs (2.67703787 2.97318329E-03 -7.73769690E-07 9.44336689E-11 -4.26900959E-15 -2.98858938E+04 6.88255571);
lowCpCoeffs (4.19864056 -2.03643410E-03 6.52040211E-06 -5.48797062E-09 1.77197817E-12 -3.02937267E+04 -8.49032208E-01);
//Cp 2609; // for T=1500K from http://www.engineeringtoolbox.com/water-vapor-d_979.html
//Hf 0; //3.34e5;
}
transport //from http://labspace.open.ac.uk/file.php/6999/t236_1_b2_unit03.pdf pg. 14 (constants applicable for temprature range 0-523 K
{
As 0; //1.383e-06;
Ts 0; //405.5;
//mu 0;
//Pr 1;
}
}
// ************************************************************************* //
I saw that in the rhoCentralFoam tutorial for inviscid flows (e.g forwardStep) the flow was simulated as inviscid by setting mu=0 in the transport part of the dictionary, although there they used Const model for the transport. So I figured it should work similarly for the Sutherland model by setting the As, Ts coefficients to 0.
But the simulation crashes after sometime with the following error:
Code:
Mean and max Courant Numbers = 714.712961755555 7526243.04395094
deltaT = 1.29974885066034e-150
--> FOAM Warning :
From function Time::operator++()
in file db/Time/Time.C at line 1055
Increased the timePrecision from 1883 to 1884 to distinguish between timeNames at time 0.0409300097404806
Time = 0.040930009740480610691548690738272853195667266845703125
[1] #0 Foam::error::printStack(Foam::Ostream&)[0] #0 Foam::error::printStack(Foam::Ostream&) in "/opt/openfoam230/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
[0] #1 Foam::sigFpe::sigHandler(int) in "/opt/openfoam230/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
[0] #2 in "/opt/openfoam230/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
[1] #1 Foam::sigFpe::sigHandler(int) in "/lib/x86_64-linux-gnu/libc.so.6"
[0] #3 Foam::multiply(Foam::Field<double>&, Foam::UList<double> const&, Foam::UList<double> const&) in "/opt/openfoam230/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
[1] #2 in "/opt/openfoam230/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
[0] #4 in "/lib/x86_64-linux-gnu/libc.so.6"
[1] #3 Foam::multiply(Foam::Field<double>&, Foam::UList<double> const&, Foam::UList<double> const&)void Foam::multiply<Foam::fvsPatchField, Foam::surfaceMesh>(Foam::GeometricField<double, Foam::fvsPatchField, Foam::surfaceMesh>&, Foam::GeometricField<double, Foam::fvsPatchField, Foam::surfaceMesh> const&, Foam::GeometricField<double, Foam::fvsPatchField, Foam::surfaceMesh> const&) in "/opt/openfoam230/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
[1] #4 in "/opt/openfoam230/platforms/linux64GccDPOpt/bin/rhoCentralFoam"
[0] #5
void Foam::multiply<Foam::fvsPatchField, Foam::surfaceMesh>(Foam::GeometricField<double, Foam::fvsPatchField, Foam::surfaceMesh>&, Foam::GeometricField<double, Foam::fvsPatchField, Foam::surfaceMesh> const&, Foam::GeometricField<double, Foam::fvsPatchField, Foam::surfaceMesh> const&)[0] at rhoCentralFoam.C:0
[0] #6 in "/opt/openfoam230/platforms/linux64GccDPOpt/bin/rhoCentralFoam"
[1] #5
[0] in "/opt/openfoam230/platforms/linux64GccDPOpt/bin/rhoCentralFoam"
[0] #7 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6"
[0] #8 [1] at rhoCentralFoam.C:0
[1] #6
[0] in "/opt/openfoam230/platforms/linux64GccDPOpt/bin/rhoCentralFoam"
[LRT:20892] *** Process received signal ***
[LRT:20892] Signal: Floating point exception (8)
[LRT:20892] Signal code: (-6)
[LRT:20892] Failing at address: 0x3e80000519c
[LRT:20892] [ 0] /lib/x86_64-linux-gnu/libc.so.6(+0x36150) [0x7f637fa55150]
[LRT:20892] [ 1] /lib/x86_64-linux-gnu/libc.so.6(gsignal+0x35) [0x7f637fa550d5]
[LRT:20892] [ 2] /lib/x86_64-linux-gnu/libc.so.6(+0x36150) [0x7f637fa55150]
[LRT:20892] [ 3] /opt/openfoam230/platforms/linux64GccDPOpt/lib/libOpenFOAM.so(_ZN4Foam8multiplyERNS_5FieldIdEERKNS_5UListIdEES6_+0xe6) [0x7f6380ce92a6]
[LRT:20892] [ 4] rhoCentralFoam(_ZN4Foam8multiplyINS_13fvsPatchFieldENS_11surfaceMeshEEEvRNS_14GeometricFieldIdT_T0_EERKS6_S9_+0x3e) [0x44b4ae]
[LRT:20892] [ 5] rhoCentralFoam() [0x432b8f]
[LRT:20892] [ 6] rhoCentralFoam() [0x42406c]
[LRT:20892] [ 7] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xed) [0x7f637fa4076d]
[LRT:20892] [ 8] rhoCentralFoam() [0x42ba3d]
[LRT:20892] *** End of error message ***
[1] in "/opt/openfoam230/platforms/linux64GccDPOpt/bin/rhoCentralFoam"
[1] #7 __libc_start_main--------------------------------------------------------------------------
mpirun noticed that process rank 0 with PID 20892 on node LRT exited on signal 8 (Floating point exception).
--------------------------------------------------------------------------
Killing PID 20885
Getting LinuxMem: [Errno 2] No such file or directory: '/proc/20885/status'
When I set the values of the As, Ts coefficients to other values (commented out in my code snippet) the simulation runs, although I get obviously wrong results...
I'm a bit confused. My turbulenceProperties is obviously also set to laminar.
Could someone please help me?
Thanks a lot in advance!
Yuval.
P.S. If more information is needed pls let me know...:) |
