Fluid-Structure Interaction Concepts, Intrinsic FSI, ANSYS Fluent

This chapter examines the detailed concepts of the intrinsic fluid-structure interaction (FSI).

In order to reduce the computational cost, it is possible to eliminate the use of external solvers and perform simultaneous fluid and solid calculations with the Fluent solver alone. In this case, there is no need for data transfer and system coupling by the exterior solver. So, this is known as intrinsic FSI.

This chapter describes the structure model in the Fluent solver. These computations can be performed in both linear elasticity and nonlinear elasticity modes.
Then, it discusses the equations and relations related to the fluid and solid computations. These governing relations consist of applied forces (from the fluid), displacements (through the structure boundary), and ultimate deformations.

In addition, it refers to one-way and two-way FSI to clarify their differences from an analytical perspective.