Bewerber
Aeroacoustic Boundary Condition Comparison (CFD)
bei German Research School for Simulation Sciences in Aachen
Description
We use the Lattice Boltzmann Method for aeroacoustic studies. In real world, sound waves travel into open space. In simulations, the domain is always restricted and waves are being reflected not only at walls, but also from open boundary conditions. There are several approaches to overcome this deficiency, from which the easiest is to simply extend the simulation domain.
However, this is not suitable for large-scale simulations and appropriate boundary conditions have to be employed to model the propagation of the sound waves into the environment.
Different types of such absorbing boundary conditions (ABC) have been developed in the last decades, mostly for traditional numerical schemes, such as
- Sponge Layer
- Perfectly Matched Layer
- Characteristic Boundaries
The goal of this thesis is to compare these boundary conditions regarding accuracy, implementation effort and suitability for our solvers as well as their computational efficiency.
Two well-studied test cases will serve as a quality measurement for these boundary conditions, namely a convected Gaussian Pulse and a Co-Rotating Vortex Pair.
Tasks
- Get used to the grid generation and simulation runs with our simulation package Musubi
- Get an overview of the required models and boundary conditions
- Implementation of one boundary type
- Run simulations for a set of defined parameters
Requirements
- Interest and background in Fluid mechanics and numerics
- Linux skills, Proactivity, team work
Person of contact
Manuel Hasert
GRS-Building Schinkelstr. 2a
3. OG, Room 301
Tel. 0241 / 80 99756
m.hasert@grs-sim.de
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