Government of Canada
Symbol of the Government of Canada

Common menu bar links

The NRC Publications Archive is now operational; however, not all the features of the site are available at this time.

The following features remain unavailable:

  • Viewing/Downloading of full text publications
  • Author browse feature
  • Affiliation/institute/portfolio search
  • NRC Publication Archive statistics

NRC is currently working to restore these features and we will update this notice as these features become available. Thank you for your patience.


 
 
 
 

Numerical simulation of fluid–solid interaction using an immersed boundary finite element method

 
 
Affiliation:
NRC Industrial Materials Institute; National Research Council Canada
Language:
English
Type:
Article
Published in:
Computers & Fluids
Date:
2012
Pages :
31-43
NRCC #:
139302
NPArC #:
21050375
Keywords:
Immersed boundary method; Fluid-solid interaction; Finite elements; Non-body-conformal mesh; Body conformal enrichment
Abstract:
This paper presents applications of a recently proposed immersed boundary method to the solution of fluid–solid interaction. Solid objects immersed into the fluid are considered rigid and their movement is determined from the interaction forces with the fluid. The use of body-conformal meshes to solve such problems may involve extensive mesh adaptation work that has to be repeated each time a change in the shape of the domain or in the position of immersed solids is needed. Mesh generation and solution interpolation between successive grids may be costly and introduce errors if the geometry changes signifi- cantly during the course of the computation. These drawbacks are avoided when the solution algorithm can tackle grids that do not fit the shape of immersed objects. We present here an extension of our recently developed immersed boundary (IB) finite element method to the computation of interaction forces between the fluid and immersed solid bodies. A fixed mesh is used covering both the fluid and solid regions, and the boundary of immersed objects is defined using a time dependent level-set function. Boundary conditions on the immersed solid surfaces are imposed accurately by using a Body Conformal Enrichment (BCE) method. In this approach, the finite element discretization of interface elements is enriched by including additional degrees of freedom which are latter eliminated at element level. The forces acting on the solid surfaces are computed from the enriched finite element solution and the solid movement is determined from the rigid solid momentum equations. Solutions are shown for various fluid–solid interaction problems and the accuracy of the present approach is measured with respect to solutions on body-conformal meshes.
 
Bookmark and Share:
 
 
 
 
Link:
HTML Link: