Where are the Navier-Stokes Equations Solved in the ConstraintIB/Falling_Sphere Example?

[JATIN RAJ]

Hello all,

I am trying to simulate sedimenting spheres using the ConstraintIB example and have observed that the system doesn't seem to reach a steady state under periodic boundary conditions. I would like to know where the NS equations are solved for the fluid so that I can look into this issue.

Any input or comments from your side on the issue would be appreciated.

Thanks , 
- Jatin

[Boyce Griffith]

On Aug 26, 2025, at 8:01 AM, JATIN RAJ <jati...@tifrh.res.in> wrote:

Hello all,

I am trying to simulate sedimenting spheres using the ConstraintIB example and have observed that the system doesn't seem to reach a steady state under periodic boundary conditions. I would like to know where the NS equations are solved for the fluid so that I can look into this issue.

ConstraintIBMethod provides the IB routines (implemented through the IBMethod interface, which is derived from IBStrategy). This is used by an IBExplicitHierarchyIntegrator along with an INS solver. That solver is provided in the constructor for IBExplicitHierarchyIntegrator.

Any input or comments from your side on the issue would be appreciated.

Thanks , 
- Jatin

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