[jnagy]

Comments and questions are welcomed on the article Coe et al., IKA-FLOW : A Flexible Body Overset Mesh Implementation for Fish Swimming, OpenFOAM Journal, https://doi.org/10.51560/ofj.v3.89.

[mco]

Please let me know if you have any questions or comments, or need any clarification about the code.

[rkandukuri]

in figures.31-34 , does the background mesh only part refer to a body fitted mesh or the overset assembly with the component meshes blanked out ? If it's the latter, whats the rationale behind including that ? I'm sorry If I missed that bit in the article ?

[mco]

Hi rkandukuri,

The background mesh only refers to the background mesh with the overset component mesh not rendered (using a threshold). This is to show the hole and the corresponding flow field for just the background mesh.

The rationale is that we found it interesting comparing the flow fields of the two and thought a reader might also be interested.

A comparison with a body fitted mesh would be good as well, but it was quite difficult to get the diffusion functions to work with the inflation layer requirements we had (35 layers). Without going into too much detail, we were looking at how fish propulsion scales from Reynolds 1e3 to 1e7, which is why the high number of inflation layers was needed. This is what prompted the development of the overset meshing route.

Please let me know if you have any other questions.

Michael

[Tianyz]

Originally Posted by mco

Please let me know if you have any questions or comments, or need any clarification about the code.

Hi Michael,

Your work is amazing, I'm using overset mesh based on OpenFOAM. But it's only for a rigid body, your contribution fills this empty. I still reading your code and want to talk with you further. Since your solver is focusing on prescribed motion (one way) currently, I'm wondering if you plan to extend it to two-way coupling in the future?

Best,
Tian

[mco]

Hi Tianyz,

Thank you for the comment. I did have a plan to implement the forces class inside the solver to get the average forces and then change the amplitude variable to balance the thrust and drag. This is outlined in the great work done by Audrey Maertens in Maertens 2017.

Currently, I'm working on another project developing heat transfer solvers. If you would like to implement something as described above, send me a private message.

Hope that helps,

Michael