An analysis of the immersed boundary surface method in foam-extend 4.1 nextRelease

​Erik Döhler presents his master thesis titled "An analysis of the immersed boundary surface method in foam-extend 4.1 nextRelease".
Student: Erik Döhler

Supervisor and examiner: Håkan Nilsson

Opponent: Anirudh Bhat

​Abstract

The Immersed Boundary Surface Method is an implementation of the immersed boundary method in the latest versions of foam-extend, a fork of the free, open-source computational fluid dynamics (CFD) sofware OpenFOAM. Instead of using body-fitted meshing methods, the immersed boundary method merges objects and boundaries into a uniform background mesh. While the immersed boundary methods contain many different merging approaches, the Immersed Boundary Surface Method merges objects, represented by triangulated surface meshes, into the background mesh consistent with cut-cell approach. 
In this thesis the implementation and limitations of the Immersed Boundary Surface method in foam-extend version 4.1 nextRelease will be investigated and analysed. In foam-extend the immersed boundary method has been implemented already in previous versions using polynomial fitting and based on the discrete ghost-cell approach but was changed tremendously in version 4.1. A detailed description of the new implemented immersed boundary surface method in version 4.1 nextRelease will be given as well as a comparison to the implementation in previous foam-extend versions. 
The repercussion of using the cut-cell approach on the choice of the background mesh is shown in guidelines for the mesh refinement. Limitations of the immersed boundary surface method are investigated on simple test cases which emphasize the implementation of mesh and mass fluxes. Additionally, implemented immersed boundary wall functions will be compared on different test cases to established body-fitted wall functions.​

The presentation online in Zoom (with waiting room before start).
Category Student project presentation
Location: Navier, meeting room, Hörsalsvägen 7A, M-huset. Or online in Zoom.
Starts: 24 August, 2022, 09:00
Ends: 24 August, 2022, 10:00

Page manager Published: Thu 11 Aug 2022.