How to simulate flow around multiple bodies?

[Li-Ming Chao]

Dear all,

I want to simulate flow around multiple bodies using ConstraintIB, and I hope to find some existed examples to have a good beginning. Are there any examples conducted on the similar topic in IBAMR/examples folder?

With best wishes!

L-Ming

[Amneet Bhalla]

Nishant/Thomas can one of you guys attach the multiple bodies using ConstraintIBMethod example here for Li-Ming. 

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--Amneet 

[Nishant Nangia]

Hi Li-Ming,

Please see attached source files for an example of how to simulate multiple bodies in ConstraintIBMethod.

Nishant

[Li-Ming Chao]

Dear Bhalla, Nangia,

Thanks so much for your help and examples!

With best regards!

Li-Ming

Nishant Nangia <nishantn...@gmail.com> 于2020年11月19日周四 上午9:28写道：

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[Li-Ming Chao]

Dear  Nangia,  

Thanks so much for your multiple bodies example!

Following your example,  I wrote the code to simulate two oscillating foils. However, I found that the parameters of the second structure  have not been used during the simulation. I have upload the document, would you mind helping me to find the error?

With best wishes!

Li-Ming

[Haotian Hang]

Hello all,

    I have a further question on the similar problem. If the structures are connected with some constrains, such as they are hinged, could you please give me some advise on how to implement this? Thank you so much!

Yours sincerely,

HH

[Boyce Griffith]

Which IB formulation are you using for handling rigidity constraints?

On Nov 22, 2020, at 1:20 AM, Haotian Hang <haot...@usc.edu> wrote:

Hello all,

    I have a further question on the same issue. If I want to simulate two structures which are connected, such as they are hinged, can you give me an advise on doing this? Thank you so much!

On Friday, November 20, 2020 at 11:40:37 PM UTC-8 clm0...@gmail.com wrote:

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[Haotian Hang]

I'm trying to use ConstraintIB to solve this problem, I don't know whether it is appropriate. Thank you!

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Haotian Hang

[Amneet Bhalla]

Hi Dewu,

Please follow this example to include multiple bodies in the code. In the driver code, you would need to create a vector of kinematics object.

Thanks,

—Amneet

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--Amneet 

[Dewu Yang]

Dear professor Amneet,

     Thanks for your reply. I followed the example which you gave me and changed the code of eel2d, but the error shown in the figure appeared when it was running. And I still have a question, shouldn't the eel2d.vertex file be a file output by executing code? Why do I give eel2d_0.vertex and eel2d_1.vertex in the code, and it shows that the eel2d_1.vertex file cannot be found when I called 'make examples'. I added the eel2d_1.vertex file by copying the eel2d_0.vertex file and renaming it，and manually changed the value. Why the eel2d_1.vertex file not automatically produced? I would appreciate it if you can give me some advice about it.

Best,

—Dewu Yang

[Yang Zhang]

Dear Professor,

I have the similar issue. In IBFE,  can we implement two structures which are connected at some nodes?

Best,

Yang

[Boyce Griffith]

On May 4, 2022, at 9:38 AM, Yang Zhang <yang.zha...@gmail.com> wrote:

Dear Professor,

I have the similar issue. In IBFE,  can we implement two structures which are connected at some nodes?

With IBFEMethod, if you use nodal coupling (as described here: https://arxiv.org/abs/2111.09958), then if two structures have overlapping nodes, those nodes will always move together. Will that work for your use case?

It also is possible to use both IBFEMethod and IBMethod in the same simulation (using class IBStrategySet). That would allow you to add springs (using IBMethod) to “tie” the IBFEMethod-based structures together. Again, you will want to use nodal coupling for the IBFEMethod-based model.

To setup IBFEMethod to use nodal coupling, you would include the following settings in the IBFEMethod configuration:

IBFEMethod {

   IB_use_nodal_quadrature = TRUE

   use_consistent_mass_matrix = FALSE

   // … other settings …

}

If you don’t use nodal interaction, then overlapping parts of the IBFE structures will tend to move together, but it is possible for them to detach from each other.

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[Amneet Bhalla]

The eel vertex file is generated using the MATLAB script eel2d_straightswimmer.m and not through the cpp code. 

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--Amneet 

[Yang Zhang]

Prof. Griffith,

Thank you for your reply. I will follow your instructions and have a try.

Best,

Yang