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.
11.05.2022 LES of nanoparticle synthesis in the SpraySyn burner: a comparison against experiments
The paper by Johannes Sellmann is now available in the Journal Powder Technology:https://doi.org/10.1016/j.powtec.2022.117466
25.4.2022 A conservative Eulerian-Lagrangian decomposition principle for the solution of multi-scale flow problems at high Schmidt or Prandtl numbers
Innovative new approach for modeling high Schmidt number and high Prandtl number flows developed. The technique can be used to simulate nano-particle reactors or the liquid cooling of electric motors and power electronics. The paper by Michael Leer is now available in the Journal of Computational Physics. (https://doi.org/10.1016/j.jcp.2022.111216 )
29.03.2022 Publication accepted in Computers and Fluids
Established and recent closures for subgrid momentum and scalar fluxes in LES were analyzed a-posteriori in a turbulent premixed burner experiment. LES of the Cambridge burner experiment using FGM tabulation were performed and the performance was compared with respect to the influence of the subgrid model. It was found that the recently developed KKK2 and sensor-enhanced Smagorinsky model outperformed the rest. This work was conducted in cooperation with the University of Federal Armed Forces in Munich.
10.01.20 Accepted for publication at Optics Express
In this work, the application of an evolutionary reconstruction technique to background-oriented schlieren tomography is presented for the first time (https://doi.org/10.1364/OE.450036).
24.11.2021 Publication accepted in Combustion and Flame
In this collaborative work with Newcastle University, the results of the quasi-DNS of a stratified flame are presented.
15.09.2021 Publication accepted in the Journal of Physical Chemistry
A collaboration within the DFG-FOR2284 project. In this study, quantum chemical calculations and isodesmic reaction approach are presented for the determination of temperature-dependent standard enthalpy of formation, entropy, and heat capacity of Si-C-H-O radicals and molecules determined by combinatorial considerations group additivity values (GAVs). For the first time, the uncertainties of the group values are calculated.
27.07.2021 Publication accepted in Combustion Theory and Modelling
In this collaborative work with Newcastle University, the validity of the famous flame efficiency function models for stratified flames are tested.
11.06.2021 Publication accepted in Flow Turbulence and Combustion
In a joint study with the Stanford University an investigation torwards the suitability of the information entropy as a quality measure was performed. Canonical cases of fluiddynamics and chaos-theory were analyzed and a dependence between the simulation quality and information entropy has been observed. Well and poorly resolved simulations were performed, and have been compared with DNS data. While several established quality measures failed to assess the simulation quality correctly, the entropy was able to distinguish between the poor and well resolved calculations. Link
26.02.2021 Publication accepted in Energy & Fuels
A hydrogen-piloted pulverized coal flame is investigated using a flamelet/progress variable approach via massively parallel LES. A method is presented that accounts for suction probing effects on the scalar field measurements and significantly improves the agreement between experiment and simulation. This work is a collaboration with the TU Darmstadt and the University of Stuttgart. Link
15.02.2021 Publication accepted in Energy & Fuels
A collaborative work in the framework of DFG-FOR2284 project. The thermal decomposition of ethylsilane (H3SiC2H5, EtSiH3) is investigated behind reflected shock waves and the gas composition is analyzed. A kinetics mechanism accounting for the gas-phase chemistry of EtSiH3 is developed, which consists of 24 Si-containing species, 31 reactions of Si-containing species, and a set of new thermochemical data. The experimental data is reproduced very well by simulations based on the mechanism of this work and is in very good agreement with literature values. It is shown that EtSiH3 is a promising precursor for the synthesis of SiC nanoparticles. Link
18.01.2021 Publication accepted in Energy & Fuels
A comprehensive Euler-Lagrange framework for pulverized coal combustion using detailed multi-step heterogeneous kinetics is presented. 3D carrier-phase DNS have been performed for a turbulent mixing layer. The data is compared to simpler pyrolysis models. A new devolatilization model approach suitable for fitting bimodal volatile release rates is proposed. This work is a collaboration of the University of Stuttgart, TU Darmstadt and University of Duisburg-Essen. Link
06.01.2021 Publication accepted in Computer and Fluids
22.12.2020 Publication in Optics Express
A novel application of tomographic imaging using multi-simultaneous measurements (TIMes) for flame emission reconstructions. Link
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