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-   -   How to write a CFD code for cylinder wake? (http://www.cfd-online.com/Forums/main/122878-how-write-cfd-code-cylinder-wake.html)

 shubiaohewan August 30, 2013 04:54

How to write a CFD code for cylinder wake?

Hi all,

I want to write a code for the wake flow behind a cylinder. Where should I start? (Of course, the cylinder.) I knew I should use the immersed boundary method. Do you have a tutorial code or reference where I can learn? Thanks.

Shu

 Alex C. August 30, 2013 08:23

It all depends on your previous experience with CFD codes. Asssuming you are new to the field, I would greatly suggest you to work the 2D case first. Going with the simplest methods at first, you could try a finite difference. You could also start with a finite volume (which will lead you further then finite difference) using Versteeg & Malalasekera Introduction book.

Also, unless you have strong experience, forget about turbulence modelling until you have strong results for inviscid and laminar flow.

 leflix August 30, 2013 20:24

Quote:
 Originally Posted by shubiaohewan (Post 448851) Hi all, I want to write a code for the wake flow behind a cylinder. Where should I start? (Of course, the cylinder.) I knew I should use the immersed boundary method. Do you have a tutorial code or reference where I can learn? Thanks. Shu
Immersed boundary (direct forcing) for your case seems indeed the simplest way to tackle this problem. It gives good results. Use finite difference too for simplicity of implementation.

 shubiaohewan August 31, 2013 05:35

Quote:
 Originally Posted by leflix (Post 448979) Immersed boundary (direct forcing) for your case seems indeed the simplest way to tackle this problem. It gives good results. Use finite difference too for simplicity of implementation.
Thank you both, Alex and leflix. I have some experience with FD, but new to immersed boundary method. I don't know where I should start. Could you recommend a textbook on IB method with simple hand-on code? Thanks.

Shu

 leflix August 31, 2013 07:10

Quote:
 Originally Posted by shubiaohewan (Post 449013) T I don't know where I should start. Could you recommend a textbook on IB method with simple hand-on code? Thanks. Shu

I don't have bibliography on mind right now,but you should find many papers in Journal for Computational Physics related to this topic.
Many different methods exist but the most simple to my mind is the direct forcing method where you ensure the no slip boundary condition on the surface of the cyinder as well as on all nodes inside the cylinder.

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