[ishaninair]

Hi,

I am simulating a flow through an scramjet engine at mach 8, using sonicFoam. But after some time following error is occurring. Please help!!!!

.................................................

Time = 0.00024255

Courant Number mean: 0.0475651 max: 0.808556
diagonal: Solving for rho, Initial residual = 0, Final residual = 0, No Iterations 0
DILUPBiCG: Solving for Ux, Initial residual = 0.000293126, Final residual = 3.26321e-07, No Iterations 1
DILUPBiCG: Solving for Uy, Initial residual = 0.00306495, Final residual = 7.17495e-06, No Iterations 1
DILUPBiCG: Solving for e, Initial residual = 0.000711042, Final residual = 5.25245e-07, No Iterations 1
#0 Foam::error:rintStack(Foam::Ostream&) in "/home/ishan/OpenFOAM/OpenFOAM-1.7.0/lib/linuxGccDPOpt/libOpenFOAM.so"
#1 Foam::sigFpe::sigFpeHandler(int) in "/home/ishan/OpenFOAM/OpenFOAM-1.7.0/lib/linuxGccDPOpt/libOpenFOAM.so"
#2 Uninterpreted:
#3 Foam::ePsiThermo<Foam:ureMixture<Foam::sutherlan dTransport<Foam::specieThermo<Foam::hConstThermo<F oam:erfectGas> > > > >::calculate() in "/home/ishan/OpenFOAM/OpenFOAM-1.7.0/lib/linuxGccDPOpt/libbasicThermophysicalModels.so"
#4 Foam::ePsiThermo<Foam:ureMixture<Foam::sutherlan dTransport<Foam::specieThermo<Foam::hConstThermo<F oam:erfectGas> > > > >::correct() in "/home/ishan/OpenFOAM/OpenFOAM-1.7.0/lib/linuxGccDPOpt/libbasicThermophysicalModels.so"
#5
in "/home/ishan/OpenFOAM/OpenFOAM-1.7.0/applications/bin/linuxGccDPOpt/sonicFoam"
#6 __libc_start_main in "/lib/tls/i686/cmov/libc.so.6"
#7
in "/home/ishan/OpenFOAM/OpenFOAM-1.7.0/applications/bin/linuxGccDPOpt/sonicFoam"
Floating point exception

............................................

Thanks

Regards,
Ishan

[Chris Lucas]

Hi,

if your Mach number is around 8, I'm not sure if a pressure based compressible solver can solve your problem. Why not use rhoCentralFoam (density based compressible solver).

Regards,
Christian

[ishaninair]

Hi Christian,

I tried using rhoCentralFoam but it is also giving the same error. Can it be coming due to DeltaT?? Right now it is 1e-07, do I need to reduce it more?

Thanks

regards,

Ishan

[sheikh nasir]

Hello
i am getting floating error:invalid number. I am working on train travelling in tunnel. Can any body help me. My email is sheikhnasir39@gmail.com

please help me
thanks
with regards