Fluid-structure interaction (FSI) occurs in many engineering and biological flows. For example, it occurs in flows in elastic blood vessels, heart valves, marine structures such as risers and conductor tubes in oil drilling platforms, civil structures such as bridges and chimneystacks, etc. Numerical simulations can play a major role in understanding FSI physics and the response behavior over a range of controlling parameters. We are actively research on how to improve FSI simulations and search for new and more efficient coupling techniques between the fluid and structure domains.