Implementing Anisotropic Adaptive Mesh Refinement in OpenFOAM

Typ
Examensarbete för masterexamen
Master Thesis
Program
Publicerad
2013
Författare
Karlsson, Jonas
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
The field of computational fluid dynamics (CFD) is growing steadily, with a rate proportional to the computational tools available. With today’s computing power available in CPU’s and clusters we are able to solve cases that were considered impossible just a few years ago. Although as we all know, even with great computational power and brute-force approaches, some problems will remain unsolvable. With this realization, adaptive mesh refinement (AMR) was introduced as a way of adapting the mesh as to reduce the computational error. AMR is relevant for CFD since it can greatly reduce the computational effort needed to solve a lot of cases. This can in turn make previously intractable simulations solvable. In this thesis we will look at how implementing a specific type of AMR could be done - namely anisotropic AMR for the OpenFOAM code-base. We will briefly look at some papers to get an idea of what constraints the mesh should satisfy and to see what kind of data-structure for the refinement history is needed. We will also look at similar functionality currently available in the OpenFOAM code. With this knowledge we define a design criteria we will use for implementing anisotropic AMR in OpenFOAM. This implementation will result in a working example of anisotropic AMR. We have also defined a tree used for storing the refinement changes that can be used for other types of AMR in the OpenFOAM codebase. We also show some graphical results of a case refined using the anisotropic AMR defined in this thesis and compare these to an isotropic refinement.
Beskrivning
Ämne/nyckelord
Data- och informationsvetenskap, Computer and Information Science
Citation
Arkitekt (konstruktör)
Geografisk plats
Byggnad (typ)
Byggår
Modelltyp
Skala
Teknik / material