Fluid–Structure Interaction

The effect of solid motion on fluid flow can be modeled by coupling ANSYS CFX software with ANSYS structural mechanics solutions. Using the unified user environment (ANSYS Workbench) fluid–-structure interaction (FSI) simulations can be easily set up. ANSYS CFX FSI solutions are an industry leader in robustness, applicability and accuracy for two-way FSI. There is no necessity to purchase, administer or configure third-party coupling and pre- and post-processing software.

The robust and flexible algorithm to deform a given fluid volume mesh in ANSYS CFX tolerates even very large boundary displacements. These displacements may be defined explicitly by the user (for example, by using CEL) or be the implicit result of an FSI simulation with ANSYS structural mechanics software or from the rigid body solver within ANSYS CFX. In all cases, boundary displacements are diffused into the interior volume mesh while ensuring that small or near-wall elements are deformed less. This maintains good boundary layer resolution and allows for larger mesh deformations with a single mesh topology.

In situations in which the boundary motion is more extreme and a single-mesh topology is simply insufficient to model the entire displacement, ANSYS CFX provides options for automatic remeshing when required during a simulation. The automatic remeshing allows users to connect to ANSYS ICEM CFD software, exploiting its scripted, batch-meshing capabilities to drive the automatic remeshing from within ANSYS CFX. Alternatively, users can integrate any other scriptable meshing software.

Aeroelastic simulation of air engine fan in ANSYS CFX (Courtesy of EMT-R)