Institute of Fluid Machinery

Fluid Structure Interaction

Fluid Structure Interaction

Combination of fluid and structural solver

  • Fluid solver: FSM research code SPARC (parallelized, 3D, Navier-Stokes, compressible, various turbulence models, LES)
  • Structural solver: Z88 (Institute of Construction and CAD, Univ. of Bayreuth)
  • Steering interface within SPARC
  • Aims: Investigation of structural excitation through flow phenomena
  • Long term: sound generation and sound transport by structural excitations
  • Applications: Vibrations of fluid mechanical systems (e.g. hydraulic systems, pump installations), biomedical flows etc.
  • Requirements: highly accurate interpolation techniques between the mainly different mesh configurations of fluid flow and structural calculation domains
  • Principle and calculation examples: see below


Example A: Unsteady Flow Around a Squared Cylinder with a Thin Flat Plate in the Wake

swinging plate in vortex street 
Swinging Plate in the Wake of a Flow Around a Cylinder


 Principle of information transfer between meshes


Principle of information transfer between meshes

Sketch for the interpolation on curved surfaces

Example B steady: Flow around cylinder



Flow mesh around cylinder (primary configuration)

Structural mesh of cylinder (primary configuration)



Steady flow solution and cylinder deformation

Deformation of meshes (excerpts)

Example C steady: Flow through channel



Elastic ring at half of channel, attached structural mesh, primary configuration

Position after steady force equilibrium is reached, elastic ring widened



Zoomed view at elastic ring after deformation

Zoomed view without structural mesh