Hi Zhikang,

you can create your mesh using gmsh and convert it to the appropriate format for nektar using NekMesh. 

I think for a simple case of cylinder, you also can set up the geometry using geo file format of gmsh and generate the mesh directly using Nekmesh

If you have installed Nektar++, please visit nektar++/utilities/NekMesh/Tests
In the Test folder, you can find several examples of generating meshes that could help you

Cheers,
Mohsen
From: nektar-users-bounces@imperial.ac.uk <nektar-users-bounces@imperial.ac.uk> on behalf of 董智康 <darrendongzhikang@gmail.com>
Sent: Tuesday, July 5, 2022 10:10 PM
To: nektar-users <nektar-users@imperial.ac.uk>
Subject: [Nektar-users] 2D Navier Stokes mesh generation
 

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Hi all,

I am learning 2D Navier Stokes equations by using Nektar++, it is a really nice tool! However, I met a problem. I’m not sure how to customize my own 2D mesh, say change the flow domain, radius and position of cylinder. I have read though your tutorials. It seems like I need a CAD .step file to achieve my goal. But I also noticed that Nektar++ can generate meshes of NACA wings. So I’m wondering if I can do the similar things to generate meshes of a cylinder.

Best,
Zhikang

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