Chair of Fluid Dynamics
The team develops and tests methods for the simulation and optimization of reactive flows and flames in installations such as heavy-duty gas turbines, nanoparticle synthesis reactors, piston engines or biomass- and pulverised coal furnaces. Our methods allow for shortened development times to further reduce costs. Our research helps to develop cost-effective, flexible and safe systems which emit fewer pollutants.
The complex processes in synthesis reactors and combustors require a detailed numerical characterisation of reaction and transport processes. Their simulation provides insights into areas, which are inaccessible to experiments, enables the investigation and comprehension of isolated subprocesses, and their interactions, and helps to bridge the gap between lab and industrial scale. For this purpose we develop and implement numerical models and methods which are necessary to describe and simulate turbulent combustion of multiphase flows as well as reaction kinetics.
Our work is financed by the state of North Rhine-Westphalia, the German Research Foundation (DFG), the Federal Ministry of Economics and Technology (BMWi), the Alliance for industrial research (AiF), national and international supercomputing centres as well as multiple private companies.
At the University of Duisburg-Essen, our group is closely linked with other groups at CeNIDE (Center for Nano-Integration Duisburg-Essen), CER.UDE (Center for Energy Research) and CCSS (Center for Computational Sciences and Simulation). As a menber of the IVG, we provide detailed simulation results and utilize data from the experiments of the other groups, which are essential for us.
The study at the chair imparts competences in the fields of flow simulation, in the description of reacting flows and in turbulence modeling.
Congratulations on passed PhD viva!
We congratulate our colleague Patrick Wollny for passing his PhD viva with distinction on March 13, 2023.
His dissertation is entitled "Bridging Macro- and Mesoscopic Methodologies for the Modeling of Nanoparticle Synthesis and Population Dynamics".
Direct numerical simulation of an unsteady wall‑bounded turbulent fow confguration for the assessment of large‑eddy simulation models
Scientifc Reports (2023), 13:11202
Direct Link: https://rdcu.be/dgySQ
The dynamics of unsteady turbulent boundary layers are investigated in a simplified benchmark case based on the famous Taylor-Green Vortex. The case features challenging dynamics which are considered of value for the development and analysis of wall-related modeling approaches in Large-Eddy Simulation. This paper marks the 5th entry to the long-term cooperation with the University of the Federal Arms in Munich.
14.03.2023 Exhaust Gas Recirculation (EGR) analysis of a swirl-stabilized pulverized coal flame with focus on NOx release using FPV-LES
In this study, highly-resolved FPV-LES are performed to investigate the combustion characteristics and the NOx-formation of a swirl-stabilized pulverized coal flame.
Two ways to determine NO species are investigated.
- In a first approach, NO species is directly extracted from the flamelet library, leading to an overprediction of the experiments by a factor > 3.
- In a second approach, an additional transport equation for NO is solved, in which the reaction source term is split into a formation and a rescaled consumption part.
The second approach better accounts for forward- and backward reactions of NO, resulting in a much better prediction of experimental data.
This work is a collaboration with the University of Stuttgart.
04.03.2023 Concerned person stimulates sponsor run in Dorsten - breast cancer needs attention
Every eighth woman is diagnosed with breast cancer once in her life. UDE Prof. Khadijeh Mohri has survived the disease and wants to encourage other women with a charity run.
Link for further information: www.brustkrebshilfe-dorsten.de
04.03.2023 Lagrangian filtered density function modeling of a turbulent stratified flame combined with flamelet approach
Physics of Fluids 34, 075110 (2022)https://doi.org/10.1063/5.0093942
This work aims to show the advantage of the Lagrangian transported FDF and the hybrid approach for a highly stratified flame, one of the most challenging members of the well-known Cambridge stratified flame series. Different criteria are tested for triggering the switch-over between the methods to maximize the efficiency of the hybrid approach, where basic flame quantities such as mixture fraction were predicted well with the assumed FDF model, and the temperature and mass fraction of carbon monoxide were predicted better by the hybrid method, featuring the transported FDF technique.”
24.10.2022 Paper accepted for publication in Progress in Energy and Combustion Science
The purpose of this review is threefold. First, it provides a systematic guide to volumetric emission tomography for combustion processes, covering the mathematical and physical foundations of key diagnostics within a unified framework. Second, existing techniques are critically reviewed, paying special attention to the proper usage and potential pitfalls of each method. Third, promising research avenues are noted and assessed.
Proud of you Prof. Mohri and team. Excellent work.
06.10.2022 CENIDE Best Paper Award 2022
Congratulations to our Tomography Group Team for the CENIDE Best Paper Award 2022!
06.10.2022 International Aerosol Conference 2022
After two years of online conferences, we appreciate that we had the chance of being part of the International Aerosol Conference 2022 in Athens. Our chair was represented by our colleagues Linus Engelmann, Monika Nanjaiah, Seung-Jin Baik, and Patrick Wollny. Together with our partner Igor Rahinov from the Open University of Israel, we contributed with five subjects, which were all very well received and discussed.
PHD Seminar (winter term 2022/23)
Links at the UDE:
- Faculty of Engineering
- Institute for Combustion and Gasdynamics
- Center for NanoIntegration, CeNIDE
- NanoEnergieTechnikZentrum, NETZ
- Center for Energy Research, CER.UDE
- Center for Computational Sciences and Simulation, CCSS
- SFB 445
- Institute of Energy and Environmental Technology e.V. (IUTA)
- Forschergruppe 2284