LES of Compressible Multi-Phase Flows using a Dual-Scale Approach

Background

Turbulent multi-phase flows play an important role in many technical applications, for example, in the combustion chamber of jet or rocket engines. Designing such systems efficiently requires highly accurate simulation methods. Unfortunately, DNS become prohibitively expensive at higher Reynolds numbers of practical interest. In contrast, LES remains affordable by resolving only the large scales of the turbulent motion. However, LES require closure models to account for the effect of the unresolved scales. Such closures exist for the momentum and the energy equations, which suffices for single-phase flows. In order to describe multi-phase flows, though, further closures are required that enter the equations describing the location of the interface.

Project Description

In this thesis, closure models for the subgrid-scale velocities according to the dual-scale approach [1] are supposed to be implemented in the Discontinuous Galerkin code FLEXI and used to simulate compressible turbulent multiphase flows. The work is structured as follows:

• Literature review on the dual-scale approach
• Implementation of the closure models
• Simulation of an initially flat interface in weakly-compressible homogeneous isotropic turbulence
• Documentation of the results

Your Profile

• Solid understanding of Discontinuous Galerkin methods
• Basic Fortran programming skills
• Basic understanding of LES

Application

If you are interested, even if you don't fulfill all the listed requirements, please send your application (incl. CV and latest transcript) via e-mail.

Start: as soon as possible