Function lower_ale_fsi_cartesian 

pub fn lower_ale_fsi_cartesian<const D: usize>(
    program: &KernelProgram,
) -> Result<AleFsiCartesianModel<D>, Diagnostic>

Lower one complete 2D or 3D conservative transient-flow FSI network.

Reuses the standalone transient Navier–Stokes and dynamic-solid recognizers. ALE maps, meshes and numerical policies remain Realization choices.

Errors

Returns EQ0703 for dimensions other than two or three, or when the typed subdomain assignment, boundary closure, interface or whole-model closure is not unique and exact.