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Showing results 1 to 14 of 14 Search took 0.00 seconds. Search: Posts Made By: Anne Lincke

Forum: OpenFOAM December 1, 2014, 04:58

Replies: 63 nutWallFunction Views: 24,116 Posted By Anne Lincke Dear Yusik, thank you for your answer.... Dear Yusik, thank you for your answer. Meanwhile, I could derive the equation by myself or rather with the help of the literature that you were also recommending. Helpful is also this link ...

Forum: OpenFOAM July 17, 2012, 11:36

Replies: 63 nutWallFunction Views: 24,116 Posted By Anne Lincke Hey Pooyan, when solving the Navier-Stokes... Hey Pooyan, when solving the Navier-Stokes Equations at the wall, convective terms vanish \int d/dx_j (u_i (P) u_j (P)) = \oint u_i(P) u_j(F) (Gauß) which is zero as u_j(F), the value of u_j...

Forum: OpenFOAM May 21, 2012, 10:53

Replies: 63 nutWallFunction Views: 24,116 Posted By Anne Lincke Hey Sam, Normally the wall boundary... Hey Sam, Normally the wall boundary condition kqRWallFunction should impose a zeroGradient boundary condition for k. This means that the gradient is equal to zero -> the value for k at the...

Forum: OpenFOAM May 4, 2012, 03:43

Replies: 63 nutWallFunction Views: 24,116 Posted By Anne Lincke Hey Sam, The diffusive term in the... Hey Sam, The diffusive term in the momentum equation contains nu_eff which is the sum of molecular and turbulent viscosity. So nut does have an influence on the solution for U. Good...

Forum: OpenFOAM May 3, 2012, 03:34

Replies: 63 nutWallFunction Views: 24,116 Posted By Anne Lincke Hey Pooyan, I asked myself the same question a... Hey Pooyan, I asked myself the same question a while ago. The answer is (in my opinion): There is no extra equation or boundary condition for the velocity at the first grid point which models the...

Forum: OpenFOAM December 16, 2011, 03:39

Replies: 63 nutWallFunction Views: 24,116 Posted By Anne Lincke Yes, you are right. y+<1 is , of course, better... Yes, you are right. y+<1 is , of course, better than having a value around 10 or 11.

Forum: OpenFOAM December 16, 2011, 03:19

Replies: 63 nutWallFunction Views: 24,116 Posted By Anne Lincke If y+ is greater than 11.xx you should use wall... If y+ is greater than 11.xx you should use wall functions, that means the law of the wall is used for k,omega,epsilon (whatever) and nut. If y+ is less than 11, the mesh is fine enough to resolve...

Forum: OpenFOAM December 1, 2011, 04:28

Replies: 63 nutWallFunction Views: 24,116 Posted By Anne Lincke Yes, this is correct. Like always, when using... Yes, this is correct. Like always, when using wall functions, the first grid node is supposed to be in the logarithmic layer, i.e. y+ ~> 30

Forum: OpenFOAM November 28, 2011, 05:40

Replies: 63 nutWallFunction Views: 24,116 Posted By Anne Lincke Thank you so much! Now I understand the... Thank you so much! Now I understand the derivation. There is one typo on the site, the missing density at the definition of tau_w, But there is no problem as the whole equation rho (nut + nu)...

Forum: OpenFOAM November 28, 2011, 03:28

Replies: 63 nutWallFunction Views: 24,116 Posted By Anne Lincke Okay, thank you for this information! Can... Okay, thank you for this information! Can you also explain the computation of nut at the wall function, especially this formula nutw[faceI] = nuw[faceI]*(yPlus*kappa_/log(E_*yPlus) - 1.0); ...

Forum: OpenFOAM November 28, 2011, 03:23

Replies: 63 nutWallFunction Views: 24,116 Posted By Anne Lincke What version do you use? I cannot find... What version do you use? I cannot find nutUWallFunction at OF-1.7. When looking at the source code of nutWallFunction I see the same computation of yPlus like in nutkWallFunction, based on...

Forum: OpenFOAM November 28, 2011, 03:18

Replies: 63 nutWallFunction Views: 24,116 Posted By Anne Lincke You can have a look at ... You can have a look at ~/OpenFOAM/OpenFOAM-1.7.0/src/turbulenceModels/incompressible/RAS/derivedFvPatchFields/wallFunctions> There you will find all kind of wall functions. Especially for your...

Forum: OpenFOAM November 2, 2011, 03:00

Replies: 63 nutWallFunction Views: 24,116 Posted By Anne Lincke Thank you very much. I borrowed the book and will... Thank you very much. I borrowed the book and will post my findings here as soon as possible.

Forum: OpenFOAM October 28, 2011, 06:01

Replies: 63 nutWallFunction Views: 24,116 Posted By Anne Lincke Hey Kurne, I am investigating about the... Hey Kurne, I am investigating about the nutWallFunction and I do not really understand the formula used in OpenFOAM in nutWallFunction which reads nutw[faceI] =...

Showing results 1 to 14 of 14

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