Rectangular domain definition using multigrid.h

[alessandr...@gmail.com]

Dear all,

I have a question about the definition of a 2D "X x Y" rectangular domain "length x height" using multigrid.h. 

Is there a way to define a domain such that "length = n*height" with n even? ( from my understanding, only odd values of n are possible).

Thanks for your help.

Cheers,

Alessandro

[Arthur Ghigo]

Hi Alessandro,

I think you can achieve this only with "multigrid.h" and by running your simulation in parallel with nproc = Height/Length.

See for details: http://basilisk.dalembert.upmc.fr/src/Tips#non-cubic-domains

Best,

Arthur Ghigo

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Best,

Arthur Ghigo

[Alessandro Della Pia]

Dear Arthur,

Thanks a lot for your answer.

From my understanding, if Height/Length is an even number, then a standard square domain is generated.

The only way to generate a rectangular domain with multigrid.h seems to be running the simulation with an odd number of processors, corresponding to an odd number of consecutive squares that make the rectangular domain.

Do you agree or I am missing something?

Thanks again,

Alessandro

[Arthur Ghigo]

Hi Alessandro,

From my understanding, if Height/Length is an even number, then a standard square domain is generated.

No, the standard square/cubic domain is generated only if the number of procs np is a square (2^2, 3^2, 4^2)/ cubic (2^3, 3^3, ...) number.

The only way to generate a rectangular domain with multigrid.h seems to be running the simulation with an odd number of processors, corresponding to an odd number of consecutive squares that make the rectangular domain.

Any number of procs np that is not square/cubic will generate a non-cubic domain.

I also forgot to mention that you can define a non square/cubic domain using embedded boundaries:

http://basilisk.dalembert.upmc.fr/src/embed.h

Best,

Arthur Ghigo

Il giorno 26 apr 2021, alle ore 19:37, Arthur Ghigo <ghigo....@gmail.com> ha scritto:

Hi Alessandro,

I think you can achieve this only with "multigrid.h" and by running your simulation in parallel with nproc = Height/Length.

See for details: http://basilisk.dalembert.upmc.fr/src/Tips#non-cubic-domains

Best,

Arthur Ghigo

On Mon, Apr 26, 2021 at 6:04 AM alessandr...@gmail.com <alessandr...@gmail.com> wrote:

Dear all,

I have a question about the definition of a 2D "X x Y" rectangular domain "length x height" using multigrid.h. 

Is there a way to define a domain such that "length = n*height" with n even? ( from my understanding, only odd values of n are possible).

Thanks for your help.

Cheers,

Alessandro

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Best,

Arthur Ghigo

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Best,

Arthur Ghigo

[Alessandro Della Pia]

Many thanks Arthur,

I really appreciate your help.

Best,

Alessandro