SC²S Colloquium - November 20, 2013

Date:	November 20, 2013
Room:	02.07.023
Time:	3 pm, s.t.

Kilian Röhner: Implementation and Validation of Multi-Grid approaches for the Lattice-Boltzmann method

With the Lattice Boltzmann Method, fluid and areodynamical flow problems can be simulated without solving the Navies-Stokes equation. Flow problems with practical application are dominated by turbulent structures. To resolve these turbulent scales in space and time with the Lattice Boltzmann Method (LBM) on equidistant grids, tremendous computational resources are required. Thus, grid refinement techniques were developed for the LBM which are based on different coupling formulations. The accuracy is determined by the resolution of the underlying grid and increases with decreasing the cell width. Grid refinement techniques raise the possibility of performing high resolution simulations and decreasing the computational effort at the same time.

In this talk, several approaches to refine the grid will be discussed. Some of them were implemented into case examples written in the Open-Source Lattice-Boltzmann Framework OpenLB. The adaption of the grid geometry as well as the interaction between different refinement levels will be explained in detail. To validate the properties of the refinement strategies, generic benchmark test cases will be presented and discussed.