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arXiv · 2610.42034

A Momentum-weighted Interface Stabilization Approach for Fluid-Structure Interaction with Strong Added-Mass Effects

Nihar Bhardwaj Darbhamulla·Xiaoyu Mao·Aditya Narkhede·David Brown·Rajeev K. Jaiman
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Abstract

Partitioned fluid-structure interaction (FSI) schemes permit the reuse of optimized standalone solvers but can become unstable under strong fluid added-mass effects, particularly when structural inertia is small relative to fluid inertia. This work traces the instability to the discrepancy between the interface pressure Schur complements of the monolithic and Dirichlet- Neumann partitioned systems, as revealed by a fixed-point analysis of the linearized FSI problem. Motivated by this analysis, a momentum-weighted interface stabilization (MWIS) is proposed, in which the interface pressure block of the fluid subproblem is augmented by an operator constructed from the fluid and structural interface momentum operators. The augmentation is consistent by construction, vanishing at convergence so that the monolithic solution is recovered. A sparse diagonal approximation of the operator, derived from element metrics, limits intersolver data exchange to quantities comparable in size to standard interface coupling data while requiring minimal modifications to the standalone solvers. Numerical experiments, spanning a linear model and established nonlinear FSI benchmarks, demonstrate improved coupling robustness in regimes of strong added-mass where the standard Dirichlet-Neumann scheme diverges.

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Nihar Bhardwaj Darbhamulla, Xiaoyu Mao, Aditya Narkhede, David Brown, Rajeev K. Jaiman. 2026-10-30. A Momentum-weighted Interface Stabilization Approach for Fluid-Structure Interaction with Strong Added-Mass Effects. https://arxiv.org/abs/2610.42034

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