CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Running, Solving & CFD

Increasing the Reynolds number

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   October 23, 2013, 10:12
Default Increasing the Reynolds number
  #1
Senior Member
 
ok
Join Date: Oct 2013
Posts: 346
Rep Power: 13
Maimouna is on a distinguished road
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
Maimouna is offline   Reply With Quote

Old   October 23, 2013, 10:45
Default
  #2
Senior Member
 
Bernhard
Join Date: Sep 2009
Location: Delft
Posts: 790
Rep Power: 21
Bernhard is on a distinguished road
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.
Bernhard is offline   Reply With Quote

Old   October 23, 2013, 12:10
Default
  #3
Senior Member
 
ok
Join Date: Oct 2013
Posts: 346
Rep Power: 13
Maimouna is on a distinguished road
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.
Maimouna is offline   Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
AMI speed performance danny123 OpenFOAM 21 October 24, 2020 05:13
Applications of Reynolds Number Nadeem99 Main CFD Forum 0 December 10, 2012 03:10
Particle Reynolds number calculation in Lagrangian tracking? jiejie OpenFOAM Running, Solving & CFD 5 July 6, 2012 05:47
Reynolds Number and Heat transfer Coefficient panos_metal FLUENT 0 January 7, 2011 07:37
Reynolds Number Matt CFX 0 February 25, 2009 06:40


All times are GMT -4. The time now is 08:11.