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October 23, 2013, 09:12 |
Increasing the Reynolds number
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#1 |
Senior Member
ok
Join Date: Oct 2013
Posts: 346
Rep Power: 13 |
Hi,
I currently trying to increase Reynolds number in incompressible cavity case by coping all folders from cavity folder to cavityHighRe which both solver is icoFoam. I changed nu in transportProperies dictionary from 0.01 (which gives Reynolds number = 10) to nu = 1.0 for Reynolds number = 100. However, that gave me the following error: ************************************************** ************************************************** *** #0 Foam::error:rintStack(Foam::Ostream&) in "/opt/openfoam221/platforms/linux64GccDPOpt/lib/libOpenFOAM.so" #1 Foam::sigFpe::sigHandler(int) in "/opt/openfoam221/platforms/linux64GccDPOpt/lib/libOpenFOAM.so" #2 in "/lib/x86_64-linux-gnu/libc.so.6" #3 double Foam::sumProd<double>(Foam::UList<double> const&, Foam::UList<double> const&) in "/opt/openfoam221/platforms/linux64GccDPOpt/lib/libOpenFOAM.so" #4 Foam::PBiCG::solve(Foam::Field<double>&, Foam::Field<double> const&, unsigned char) const in "/opt/openfoam221/platforms/linux64GccDPOpt/lib/libOpenFOAM.so" #5 in "/opt/openfoam221/platforms/linux64GccDPOpt/bin/icoFoam" #6 in "/opt/openfoam221/platforms/linux64GccDPOpt/bin/icoFoam" #7 in "/opt/openfoam221/platforms/linux64GccDPOpt/bin/icoFoam" #8 in "/opt/openfoam221/platforms/linux64GccDPOpt/bin/icoFoam" #9 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6" #10 in "/opt/openfoam221/platforms/linux64GccDPOpt/bin/icoFoam" Floating point exception (core dumped) maimouna@maimouna-desktop:~/OpenFOAM/maimouna-2.2.1/run/tutorials/incompressible/icoFoam/cavityHighRe$ ^C maimouna@maimouna-desktop:~/OpenFOAM/maimouna-2.2.1/run/tutorials/incompressible/icoFoam/cavityHighRe$ ************************************************** ************************************************** ****** What's that mean? What's my mistake? How to solve it? What are the suitable changes regarding this case (Increase Reynolds number)? I follow the same changes in User Guide page 37-38, but the erroe still the same. Regards |
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October 23, 2013, 09:45 |
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#2 |
Senior Member
Bernhard
Join Date: Sep 2009
Location: Delft
Posts: 790
Rep Power: 21 |
Well, if you increase the viscosity, you decrease the Reynolds number, this is a conceptual mistake.
What is in user guide page 37-38?? In changing viscosity, you change the numerical problem, so you would probably have to do something like time step decrement. |
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October 23, 2013, 11:10 |
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#3 |
Senior Member
ok
Join Date: Oct 2013
Posts: 346
Rep Power: 13 |
Many thanks Bernhard for your reply. Sorry bu mistake I wrote nu = 1.0 it is 0.1. I already did that. What exactly I have to change numerically besides time step.
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