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Old   October 23, 2013, 09:12
Default Increasing the Reynolds number
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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/"
#1 Foam::sigFpe::sigHandler(int) in "/opt/openfoam221/platforms/linux64GccDPOpt/lib/"
#2 in "/lib/x86_64-linux-gnu/"
#3 double Foam::sumProd<double>(Foam::UList<double> const&, Foam::UList<double> const&) in "/opt/openfoam221/platforms/linux64GccDPOpt/lib/"
#4 Foam::PBiCG::solve(Foam::Field<double>&, Foam::Field<double> const&, unsigned char) const in "/opt/openfoam221/platforms/linux64GccDPOpt/lib/"
in "/opt/openfoam221/platforms/linux64GccDPOpt/bin/icoFoam"
in "/opt/openfoam221/platforms/linux64GccDPOpt/bin/icoFoam"
in "/opt/openfoam221/platforms/linux64GccDPOpt/bin/icoFoam"
in "/opt/openfoam221/platforms/linux64GccDPOpt/bin/icoFoam"
#9 __libc_start_main in "/lib/x86_64-linux-gnu/"
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

************************************************** ************************************************** ******
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.

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Old   October 23, 2013, 09:45
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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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Old   October 23, 2013, 11:10
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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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