[losiola]

Hi guys ,
I am new to openFoam and i want to make a 2D airfoil simulation with the k kl omega turbulence modele . How can i set the boundary conditions for my simulation and what are the files that i need for it (kl kt omega p u ...)?

[losiola]

No Answers !! Come on guys i really need your help .. ive been looking around i ve found a tutorial in openfoam that uses k-Kl omega turbulence model named ellipssekklomega May i use the same boundary like the tutorial? and how about the symmetry boundary for top and bottom will i still be able to use it with my 2D airfoil Simulation ?!


Thank you

[yambanshee]

You're giving way too little information to really be helped. How does your domain look? what boundaries do you have? etc... It's more helpful to ask specific questions rather than such a vague general question with no prior insight of your own

[losiola]

Originally Posted by yambanshee

You're giving way too little information to really be helped. How does your domain look? what boundaries do you have? etc... It's more helpful to ask specific questions rather than such a vague general question with no prior insight of your own

Thank you for the Replay Yambanshee , Now i ve fixed the problem of divergence of my simulation but i still have a question for the Y+ value for the Kkl Omega turbulence model .


How much should be the value for the Y+ since am using the nutLowReWallFunction ?

[yambanshee]

Originally Posted by losiola

Thank you for the Replay Yambanshee , Now i ve fixed the problem of divergence of my simulation but i still have a question for the Y+ value for the Kkl Omega turbulence model .


How much should be the value for the Y+ since am using the nutLowReWallFunction ?

Typically a y+ in the region of < 1 is prefered

[losiola]

Originally Posted by yambanshee

Typically a y+ in the region of < 1 is prefered

Hello Again Thank you for your help ,
and i still have some issues with my simulation Hope you can help me with it,
I run my 2D airfoil simulation and it's converging and giving me results for Cm Cl Cd but the results i got are bit too High for the Cd and Cl compared to the experimental Data.

th got a Cl=0.3518 while in experience is Cl=0.2954
and for drag i got Cd=0.0142 while in experience it is Cd =0.00883

In order to resolve the problem I ve tried to refine the mesh (mesh independance) and yet there still the Same Problem.

Is it possible that there is a Problem with my boundary conditions or my Initial Values?

I ll send you my boundary conditions files via email if it's okk with you!

[beyonder1]

Originally Posted by losiola

Thank you for the Replay Yambanshee , Now i ve fixed the problem of divergence of my simulation but i still have a question for the Y+ value for the Kkl Omega turbulence model .


How much should be the value for the Y+ since am using the nutLowReWallFunction ?

Hi Os,
I am also facing the Omega divergence issue. Could you let me know how you fixed the divergence? Also, how are you setting the initial conditions?

Thanks