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Showing results 1 to 12 of 12 Search took 0.00 seconds. Search: Posts Made By: romant

Forum: OpenFOAM Programming & Development October 25, 2018, 15:43

Replies: 44 Wall functions - questions about implementation Views: 19,787 Posted By romant Hi Meihua, It should work the same as for... Hi Meihua, It should work the same as for the nut. I think what you have to do is take the nuSGSWallFunction instead of the nutWallFunction and use a similar approach. The nuSGS is 0 at the...

Forum: OpenFOAM Programming & Development October 10, 2018, 14:52

Replies: 44 Wall functions - questions about implementation Views: 19,787 Posted By romant Hi meihua, The wall shear stress is... Hi meihua, The wall shear stress is implemented through the turbulent viscosity on the wall, since it is 0 on the wall, it can be re-used for other purposes. You can find the implementation...

Forum: OpenFOAM Programming & Development April 8, 2014, 02:42

Replies: 44 Wall functions - questions about implementation Views: 19,787 Posted By romant Hej, when you take a look here... Hej, when you take a look here http://www.openfoam.org/docs/cpp/ all the way at the bottom, there is a link to boundary conditions. It will take you to the boundary conditions that can be found in...

Forum: OpenFOAM Programming & Development April 7, 2014, 08:11

Replies: 44 Wall functions - questions about implementation Views: 19,787 Posted By romant Wall functions predict the velocity in the first... Wall functions predict the velocity in the first grid point based on theory. However, it is very hard to just prescribe the velocity in the first grid point and keep it fixed. In order to achieve the...

Forum: OpenFOAM Programming & Development April 7, 2014, 08:01

Replies: 44 Wall functions - questions about implementation Views: 19,787 Posted By romant Of course the velocity in the first interior grid... Of course the velocity in the first interior grid point is calculated through the solution of the velocity field. In the law of the wall / or any other wall function, you would like to set the...

Forum: OpenFOAM Programming & Development April 7, 2014, 03:06

Replies: 44 Wall functions - questions about implementation Views: 19,787 Posted By romant I think your first assumption is correct. ... I think your first assumption is correct. For the other parts: 1. you use the log law or the linear law to find the velocity in the first point away from the wall away from the grid, not he...

Forum: OpenFOAM Programming & Development April 5, 2014, 17:48

Replies: 44 Wall functions - questions about implementation Views: 19,787 Posted By romant I think when you look into the code you can see... I think when you look into the code you can see that you don't need the newly calculated epsilon in the first cell anymore, after you have solved the system....

Forum: OpenFOAM Programming & Development April 5, 2014, 17:28

Replies: 44 Wall functions - questions about implementation Views: 19,787 Posted By romant You can use 0 for the velocity, because the shear... You can use 0 for the velocity, because the shear velocity is not a velocity in this sense. It is calculated as u_{\tau}=\sqrt{\frac{\tau_w}{\rho}} where \tau_w is the the wall shear stress...

Forum: OpenFOAM Programming & Development September 20, 2013, 08:22

Replies: 44 Wall functions - questions about implementation Views: 19,787 Posted By romant Yes, most of the wall functions in OpenFOAM, with... Yes, most of the wall functions in OpenFOAM, with the exception of the kqRWallFunction, manipulate either the first cell value, or the wall value (in the case of the mut or nut wall functions) and...

Forum: OpenFOAM Programming & Development September 20, 2013, 08:09

Replies: 44 Wall functions - questions about implementation Views: 19,787 Posted By romant The omega or epsilon wall function do not just... The omega or epsilon wall function do not just set a boundary condition for the differential equations in the common sense, like dk/dy=0 or k=const. But they manipulate the value at the first point...

Forum: OpenFOAM Programming & Development September 20, 2013, 07:56

Replies: 44 Wall functions - questions about implementation Views: 19,787 Posted By romant If you take a look at the implementation of the... If you take a look at the implementation of the kqRWallFunction, which is the corresponding wall function for k, you will notice, that k does not have a function updateCoeffs. The wall function also...

Forum: OpenFOAM Programming & Development May 14, 2012, 09:49

Replies: 44 Wall functions - questions about implementation Views: 19,787 Posted By romant The nutLowReWallFunction is only their to provide... The nutLowReWallFunction is only their to provide an access to the yPlus calculation tool (which in the original OF implementation gives weird values when using lowRe numbers, I suggest using...

Showing results 1 to 12 of 12

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