Hi Swagat, Not sure anyone answered this. 1) You could try to add a Forcing term. Much like ForcingBody in library/Solverutils/Forcing. I think something similar to what you describe has been done for the moving reference frame (ForcingMovingReferenceFrame) i.e. additional terms that are gradient of velocity. 2) At the end of the .geo file there is a protion where Physical objects are declared. Sth. like: Physical Line(1) = {3,1,2,4}; Physical Surface(2) = {6}; My experience with NekMesh is that composite 2 is the 2D domain and composite 1 the boundary. Cheers, Stan On czw, 2019-05-23 at 14:25 +0900, Swagat Kumar Nayak wrote:

Hi everyone,

I am trying to simulate the flow of a precessing cylinder in the cylinder frame of reference. I have got some additional terms in the incompressible Navier-stokes equation which are velocity dependent. (1) How do I add these additional terms to the incompressible Navier- stokes equation?

(2) When I create a mesh in Gmsh and try to convert it into the .xml file format, how do I identify the composites corresponding to the global boundaries?

I am new to this framework. So, any help will be largely appreciated.

Thank you,

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