Computational Modelling Numerical Simulations Mathematical Modelling Dr. Georgi Djambazov Senior Research Fellow home page »

Numerical Techniques for Computational Aeroacoustics

Georgi Djambazov

Doctor of Philosophy

1998

School of Computing and Mathematical Sciences

PhD project was sponsored by the University of Greenwich

This project was completed in September 1998. ---> Thesis Summary

The direct simulation of aerodynamic sound involves: Numerical Integration of the Linearized Euler Equations. These describe the relations of the acoustic components of pressure, velocity and density, and are obtained after splitting the fluid flow variables into mean flow and perturbation parts. To solve, a finite volume discretization can be employed in the `near field' - the sound-generation region.

A fully-staggered computational grid is used which makes the computational code stable and efficient.

For longer simulations in wider domains (extending to the `far field') a special Acoustic Module was built based on higher-order finite-difference numerical schemes which exhibit finite-volume properties at solid boundaries thanks to the staggered mesh.

To use existing Computational Fluid Dynamics (CFD) codes like the UoG PHYSICA, a Domain Decomposition approach is followed. The `flow' and `acoustic' parts of the unknown variables have separate meshes in overlapping domains. At each time step the flow simulation is followed by a Linearized Euler solution to construct the full sound field.

• Dr Choi-Hong Lai
• Prof K.A.Pericleous