Lydia
Ansys Employee

Hello,

Why would you like to use solid226 for your Fluid and Structure Interaction analysis?

If you check this doc link https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v241/en/ans_elem/Hlp_E_SOLID226.html?q=solid226 this element is used to couple structural with thermal/electric analysis. It is not used for coupling structures with fluids.Â