Implement partitioned FSI in svMultiPhysics

Use Case

Our team at Yale (led by my advisor @mrp089) wants to implement partitioned Fluid-Structure Interaction (FSI) in svMultiPhysics as a step toward integrating fluid-solid-growth (FSG) modeling from prior research with growth and remodeling (G&R) solid materials.

Problem

The previous FSGe framework is based on svFSI, and we had encountered significant challenges integrating FSGe with the current svMultiPhysics framework. The current monolithic FSI approach in svMultiPhysics cannot accommodate multiple time scales, specifically the longer time scales required for solid mechanics and growth processes compared to fluid dynamics.

Solution

As the first step, we want to implement partitioned FSI in svMultiPhysics (with a hyperelastic solid material). Our implementation can be easily validated against the current monolithic FSI version and can be extended in the future to use G&R materials.

Alternatives considered

We considered maintaining our existing FSGe implementation based on the earlier svFSIplus version rather than integrating with svMultiPhysics. However, this would isolate our research from active development on the main branch.

Additional context

No response

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