[supvato]

Hello, everyone.

I am trying to run a 2D simulation of flow over a circular patch of cylinders (basically a circular tube bundle) as shown in the figure (https://imgur.com/s9udiTm). The Reynolds of the small cylinders will have a range Re=73 to 1,132 depending on the diameter and the free stream velocity.

I am not very knowledgeable in CFD, so please bear with me. I have read that for simulating flow around cylinder, the best type of mesh is the o-type. Unfortunately, because of how the small cylinders are structured, I've found it difficult to apply mesh blocking, so I was wondering if it was possible to do an o-mesh over each small cylinder, have an unstructured mesh between the small cylinders, and then transition back to an o-type mesh outside of the circular patch. If this is possible, would you mind giving me a brief explanation of how to do it or a pointer to where this info can be found?

Using this type of mesh is not something I'm set on, so I am open to any other suggestions that you think could work.

Thanks in advance for any help.