A Multirate Approach for Fluid-Structure Interaction Computation with Decoupled Methods

TL;DR

This paper introduces a multirate time step method for fluid-structure interaction that uses different time steps for fluid and structure, improving computational efficiency while maintaining accuracy and stability.

Contribution

It presents a novel multirate approach applied to decoupled FSI methods, demonstrating stability and efficiency gains over traditional single time step schemes.

Findings

The multirate method is stable and accurate.

It reduces computational cost significantly.

The approach retains the order of accuracy of single time step schemes.

Abstract

We investigate a multirate time step approach applied to decoupled methods in fluid and structure interaction(FSI) computation, where two different time steps are used for fluid and structure respectively. For illustration, the multirate technique is tested by the decoupled \beta-scheme. Numerical experiments show that the proposed approach is stable and retains the same order accuracy as the original single time step schemes, while with much less computational expense.