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-   -   Starting a 3D URANS simulation from a converged 2D URANS simulation (https://www.cfd-online.com/Forums/main/89112-starting-3d-urans-simulation-converged-2d-urans-simulation.html)

 Josh June 4, 2011 18:43

Starting a 3D URANS simulation from a converged 2D URANS simulation

Good day -

When studying airfoils, many DNS and LES users solve a two-dimensional (2D) simulation at first to resolve the general characteristics, then employ a three-dimensional (3D) model with the initial condition set as the converged solution of the 2D simulation.

Is there any reason this concept shouldn't work for URANS? The airfoil, mesh, and other setup parameters are identical from the 2D and 3D - the only thing that changes is the airfoil now has a finite span, but no span-wise variations, i.e., no taper. It is just an airfoil profile with a finite length.

Thanks for your help.

 cfd_newbie June 4, 2011 20:29

Quote:
 Originally Posted by Josh (Post 310538) Good day - When studying airfoils, many DNS and LES users solve a two-dimensional (2D) simulation at first to resolve the general characteristics, then employ a three-dimensional (3D) model with the initial condition set as the converged solution of the 2D simulation. Is there any reason this concept shouldn't work for URANS? The airfoil, mesh, and other setup parameters are identical from the 2D and 3D - the only thing that changes is the airfoil now has a finite span, but no span-wise variations, i.e., no taper. It is just an airfoil profile with a finite length. Thanks for your help.
Dear Josh,
To my understanding, DES and LES are not recommended for 2D at all. I have asked a similar question on the forum http://www.cfd-online.com/Forums/main/89070-des-2d.html
but no one has replied to it yet. Please reply to it if possible.
Raashid

 Josh June 4, 2011 20:32

I'm not trying to run DNS or LES in 2D. I have run URANS simulations in 2D and want to run them in 3D with the initial conditions set as the converged solutions of the 2D URANS.

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