Master and Diploma Projects
For excellent students we also offer projects which should lead to journal publications.
The chair of Fluid Dynamics also supports students who want to arrange their projects in cooperation with industry - provided that there are no non-disclosure agreements.
To top students, we also offer external Master’s projects with friends and colleagues at other universities, for example in Trondheim (Norway), Newcastle (UK) or Berkeley (US). Some prior work as a HiWi with us is a prerequisite, so we can make sure to only send out excellent students.
On request outstanding students can also realize important projects as Research Assistants.
Please contact: project.cfd [at] uni-due.de
Master and Diploma Projects which should lead to publications
200127: Master's Project: Numerical Investigation of Engine Knock
Engine knock remains a little understood phenomenon and represents a major unsolved problem in the context of ICE (internal combustion engines). It prevents the use of an engines optimal state of load, thus lowering the efficiency of the engine. Pre-combustion knock (or super-knock, a local premature ignition) is especially dangerous, as it may result in the complete failure of the engine. The aim of this thesis is to numerically investigate the physics of knock for a detonation wave propagating at Chapman-Jouguet speed. This detonation wave exhibits an unstable wave front, including the stochastic appearance of high momentum jets, which need to be analyzed. The simulations will be carried out with in-house code PsiPhi, whereby the setup of this type of simulation must be implemented and suitable ways to post-process the data must be found.
The project is challenging and requires strong skills in the field of fluid dynamics, thermo dynamics, reaction kinetics and numerics (FORTRAN, Python). It will be only attempted with very good candidates or long term HiWis.
180619: Master’s Project on Camera Calibration
For a generic tomographic reconstruction algorithm highly accurate calibration of the cameras' intrinsic and extrinsic parameters (e.g. focal length and location) is necessary. Having sound parameters will help to decrease various artefacts and improve the reconstruction quality. The student will design a calibration target that is easy to manufacture and handle, but leads to a set of optimal parameters. The influence of the shape of the target on the parameters can be assessed by an existing in-house calibration algorithm. In a first step of the development process the student will become familiar with the code and test different target shapes. In a second step the target, based on the previous findings needs to be manufactured, e.g. with help of a 3D-printer. In the last phase of the project the target will be tested under real world conditions with our tomographic setup.
180523: Bachelor/Master Project: Background-oriented schlieren deflections using different patterns
Background-oriented schlieren is a flow visualisation method that detects the effect of variable refractive index on light rays. In a typical setup, a camera is focused onto a background pattern. When the refractive index between the camera and background is constant the light rays travel in straight lines, but when the refractive index varies (for example by introducing a flame between the camera and background), the pattern on the background gets distorted due to the refraction (bending) of light. The deflection magnitudes and directions can be calculated to give in indication about the refractive index field that the light rays have traveled through. The aim of this project is to investigate different background patterns, at different distances from the camera and write a code that calculates the deflections. The candidate must have a strong mathematical and programming background.
For further information please contact: email@example.com.
170605: Large-Eddy Simulation of non-linear Thermoaccoustics (HiWi/Master)
Low emission (lean premixed combustion) gas turbine engines are prone to thermo-accoustic instabilities that can lead to the destruction of engines, which must be avoided, necessitating a detailed understanding of the phenomenon from simulation. Such Large-Eddy Simulations will be conducted using the in-house code PsiPhi, which is suitable for efficient, massively parallel simulations on super-computers. Recent work by our research group has shown that the normal, linear treatment of wave-propagation may not be sufficient at high frequencies of the instability, and we aim to simulate the phenomenon at high pressure levels, where even (non-linear) shock waves may occur. The present project aims at analyzing the phenomenon and preparing further research into this new topic. The work will involve setting up simulations, processing and interpreting the data, and writing a suitable report. A short version of the thesis shall be turned into a research paper that can be submitted to an international journal. A suitable student will have a strong background in fluid mechanics, mathematics and computer programming, and will be open to learning about new phenomena. The present project can be conducted in collaboration with researchers from the Technical University of Munich (TUM). A HiWi job on related topics can be offered prior to the Master’s project, using a closely related software.
170604: Direct Numerical Simulation of Solid Particle Combustion (HiWi/Master)
Solid fuel particles are burned in coal boilers, solid rocket engines, bio mass combustors and similar systems. A problem with understanding this type of combustion is the poor optical access, so that suitably detailed experiments cannot be performed to improve combustion, to understand the physics, or to reduce the emissions produced in such a process. The present work will aim at shedding light on such cases, by simulating the combustion of particles (coal, which is well characterized) by direct numerical simulation. Such simulations resolve the turbulent flow, chemical reactions, species transport, heat release, radiation and their interactions, producing large datasets that can be mined for understanding the process and for building models that can be used in engineering applications. The DNS will be conducted by the project student, using the inhouse code PsiPhi and high-performance computing facilities. The work will involve setting up simulations, processing and interpreting the data, and writing a suitable report. A short version of the thesis shall be turned into a research paper that can be submitted to an international journal. A suitable student will have a strong background in fluid mechanics, mathematics and computer programming, and will be open to learning about new phenomena. The present project can be conducted in collaboration with researchers from Trondheim University (Norway).
A HiWi job on related topics can be offered prior to the Master’s project, using a closely related software.
Please contact Andreas Kempf (firstname.lastname@example.org) for further information.
160811: Numerical Simulation of Primary Jet Breakup
Fuel injectors operate at high pressures and inject fuel into a combustion chamber, where the jet breaks up and eventually forms droplets that break into further droplets. The present project aims at researching methods for the simulation of multi-phase flows with large density differences and surface tension, choosing the most promising technique, implementing it into the in-house code PsiPhi and running test-simulations with it. Applications of the work extend from liquid jets in a gas-phase to bubbles raising in liquids. The project is very challenging and will only be attempted with very good candidates or HiWis.
For further information please contact: andreas.kempf [at] uni-due.de
161108: Optimised Numerical Schemes for the Large-Eddy Simulation of Turbulent Combustion
Large-Eddy Simulation is a modern CFD technique for accurately predicting turbulent reacting flows by affordable computer simulation. The method has evolved over the last 15 years and is finally becoming available in commercial software programs and being used by industry leaders.
However, the method requires numerical schemes that combine high numerical accuracy with low numerical oscillation. Our group has used a hybrid approach with good success, combining accurate central differencing schemes for momentum transport with non-dispersive TVD schemes for scalar transport. Where this hybrid approach combines good accuracy with low dispersion, it can lead to inconsistencies when applied with certain combustion models based on the "Flames Surface Density" approach.
The present project will apply different combinations of available numerical schemes to different test cases, to eventually assess the overall error resulting from the schemes. Based on the findings, further transport schemes (e.g. (W)ENO) shall be implemented and tested, aiming to improve overall accuracy, reliability and robustness of the simulations.
Students interested in this project will require a strong background in fluid-mechanics and should ideally have some background in numerical techniques, programming, combustion and turbulence modelling.
Please contact andreas.kempf [at] uni-due.de for further information.