[Lloyd Sullivan]

Hi STAR-CCM+ users,


I am trying to simulate a transient case with a force function applied to a rigid cylinder only in the x-direction without using overset meshing.


https://imgur.com/Ckjs5Gq


I have done this successfully in ANSYS CFX and want to replicate the problem in STAR CCM+.



I have a few questions.
1. Does the mesh have to be 3D (1 cell thick) to use DFBI with a mass or can it be 2D?


2. Can you apply DFBI to a boundary and not a region (i.e. just the surface of the cylinder)?


3. Is it possible to define that all boundaries and whole domain move at the same rate as the cylinder - thus not deforming the mesh at all? (I have successfully done this in CFX).



Any answers to any of the questions are greatly appreciated.


Best regards,


Lloyd Sullivan

[Ubuntu]

Hello, I will try to answer your questions.

Originally Posted by Lloyd Sullivan

1. Does the mesh have to be 3D (1 cell thick) to use DFBI with a mass or can it be 2D?

I think the latest version of star ccm+ has 2D DFBI capability.
http://www.ata-plmsoftware.com/wp-co...EN_smaller.pdf

Originally Posted by Lloyd Sullivan

2. Can you apply DFBI to a boundary and not a region (i.e. just the surface of the cylinder)?

I have seen rigid body options for boundaries in morphing motion. Not sure if that's what you are looking for.

Originally Posted by Lloyd Sullivan

3. Is it possible to define that all boundaries and whole domain move at the same rate as the cylinder - thus not deforming the mesh at all? (I have successfully done this in CFX).

That's how DFBI works in Star CCM+, the whole domain moves.

Hope this helps you