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June 4, 2011, 13:51 |
Which Solver should I choose?
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#1 |
New Member
Mike
Join Date: May 2011
Posts: 19
Rep Power: 14 |
Hello,
I would like to simulate incompressible laminar flow over a semi-infinite flat plate at zero incidence, with constant density throughout the flowfield. The thing is that I want to compare the results that I will get with OF, with a homemade algorithm that I have built in FORTRAN, that simply solves the Continuity and X-Momentum equations, like listed in the attachment. I am thinking of choosing icoFoam or simpleFoam with turbulence turned off, but I can't understand how they are different (Transient vs Steady State solver) and what will the impact on my obtained solution be. If anybody has a remark, I would be grateful Mike |
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June 4, 2011, 14:04 |
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#2 |
New Member
Join Date: Aug 2010
Location: Chennai
Posts: 24
Rep Power: 15 |
If you are interested in steady state solution, u can opt for simpleFoam.
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June 4, 2011, 14:13 |
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#3 |
New Member
Mike
Join Date: May 2011
Posts: 19
Rep Power: 14 |
So, if I choose simpleFoam, what would be a reasonable value for timeStep in ControlDict? Should I set timeStep= 1 sec and run until convergence?
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June 4, 2011, 16:38 |
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#4 |
Senior Member
Alberto Passalacqua
Join Date: Mar 2009
Location: Ames, Iowa, United States
Posts: 1,912
Rep Power: 36 |
Yes, and if you want 1D case, create a mesh with only one cell in the Y and Z direction.
Best,
__________________
Alberto Passalacqua GeekoCFD - A free distribution based on openSUSE 64 bit with CFD tools, including OpenFOAM. Available as in both physical and virtual formats (current status: http://albertopassalacqua.com/?p=1541) OpenQBMM - An open-source implementation of quadrature-based moment methods. To obtain more accurate answers, please specify the version of OpenFOAM you are using. |
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June 6, 2011, 17:09 |
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#5 |
New Member
Mike
Join Date: May 2011
Posts: 19
Rep Power: 14 |
Well, I want to increase Reynolds (~10^7) so that I have turbulent flow. I used k-epsilon model. I just introduced 2 files (k and epsilon) under 0 folder and the necessary fvschemes and fvsolution modifications. Is this correct? Or do I need other changes and files under 0 folder, like nutilda ?
And after that, how can I plot the u-velocity in gnuplot or paraview (if possible), towards timesteps ? Thanks! PS: i added 2 images. The first is the laminar fully developed boundary layer and the second is the turbulent fully developed boundary layer. Last edited by mikemech; June 6, 2011 at 17:34. Reason: images added |
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December 13, 2011, 13:38 |
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#6 |
New Member
Ricardo
Join Date: Sep 2011
Posts: 15
Rep Power: 14 |
mikemech, Alberto....
why would one need to give a time step to this type of problem, when you are doing steady-state simulation??? if you have steady-state the time dependence would disappear wouldn't it??? Thanks -Ricardo |
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December 13, 2011, 23:47 |
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#7 |
Senior Member
Alberto Passalacqua
Join Date: Mar 2009
Location: Ames, Iowa, United States
Posts: 1,912
Rep Power: 36 |
In steady-state solvers, the time-step is just a counter for the number of iterations. Simply use 1.
__________________
Alberto Passalacqua GeekoCFD - A free distribution based on openSUSE 64 bit with CFD tools, including OpenFOAM. Available as in both physical and virtual formats (current status: http://albertopassalacqua.com/?p=1541) OpenQBMM - An open-source implementation of quadrature-based moment methods. To obtain more accurate answers, please specify the version of OpenFOAM you are using. |
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