Free slip boundary condition

[marcanyada]

Hi everyone,rnrnI am beginning with OpenLB and I would like to implement a free slip boundary conditon on a straight wall, that is (as far as I know) zero velocity for the velocity component normal to the wall and zero gradient for the other velocity components.rnrnCould someone give me some ideas about how to do it?rnrnThank you!

[Alejandro_Claro]

Hi marcanyada,rnrnThe free slip boundary condition on a straight wall have been already implemented in the addslipboundary function. The approach implemented is the specular reflection.rnrnOtherwise, you can write a new class in order to implement this condition in the post-process step. You could check how it is implemented with the createInterpBoundaryCondition2D class.rnrnBest Regards,rnAlejandro

[shaunellis22]

Hi,

I am trying to implement a free-slip boundary condition in a D3Q19 Descriptor, would it be possible to elaborate on how to implement the addSlipBoundary function by using the createInterpBoundaryCondition ?

Many Thanks,

Shaun

[mathias]

We already did implement a free-slip condition. It works like bounce-back. Please have a look at the dogygen documentation on our web site.

Best
Mathias

[shaunellis22]

Hi Mathias,

Thank you for your quick reply. Has the free-slip condition only been implemented for the 2D case? I am able to generate some nice results in 2D. However I am interested in simulating a 3D model and undergoing the same method I get the error ‘no member named ‘addSlipBoundary”.

Many thanks,
Shaun

[mathias]

Right. It will be included in the next release which will be available in about amounth or two. Best mathias

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