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.

Contours of joint PDFs normalised normal strain rate with normalised curvature at H1 (7-13mm) and H2 (30-37mm) for different c-values.

15.05.2018 Paper accepted and selected as „Editor’s Pick“ by Physics of Fluids

The statistics of reactive scalar gradient and associated strain rates have been investigated in a bluff body stabilized premixed flame configuration using a high-fidelity simulation database. The findings of this analysis are of pivotal importance for the development of accurate combustion models.

04.05.2018 "Publication" in Panini scrapbook

The photo of the lab work of our former colleague Dr. Weise was published as a two-part sticker: C. Weise, Schwarzes Gold, Panini, Picture 111-112, 2018 (Impact Factor = 0).

Description of the computational domain for the DNS of inert and reactive scalar mixing in homogeneous turbulence with a constant density fluid. The depicted iso-scalar surfaces are those with Y=0.5.

16.03.2018 New publication in Flow, Turbulence and Combustion

This research aims at gaining some physical insight into the problem of scalar mixing, following the time evolution of propagating iso-surfaces. A rigorous kinematic analysis of non-material line, surface and volume elements, related to propagating iso-scalar surfaces, is presented; this formalism is valid for both constant and variable density flows. 

Flow, Turbulence and Combustion, 1-32

08.02.2018 Martin Rieth has successfully passed his doctoral examination

Martin has successfully passed his examination on "Large Eddy and Direct Numerical Simulation of Single and Multiphase Flows Relying on Lagrangian Particle Methods". Congratulations!

29.11.2017 New publication in Fuel

The non-premixed steady flamelet model is extended by two simple, robust and effective heat loss modelling approaches. The heat release damping (HRD) approach decreases the chemical source term in the energy equation by a constant factor, while the artificial radiation (AR) approach introduces an augmented temperature dependent radiative source term. The models are tested in a simulation of the 0.78 MWth IFRF (International Flame Research Foundation) pilot scale, non-premixed, natural gas/oxygen flame. The heat loss modelling yields a significant improvement in every quantity over the classical adiabatic flamelet model.

Fuel 216 (2018)

26.10.2017 New publication in Combustion Science and Technology

The influence of the global Lewis number, Le, on the statistical behavior of the 'effective' normal and tangential strain rates have been analyzed based on three-dimensional DNS data of freely propagating statistically planar turbulent premixed flames with Le = 0.34, 0.60, 0.80, 1.00 and 1.20.  It has been found that turbulent flames with small values of Lewis number exhibit flame thinning and high values of the flame surface area and these tendency strengthens with decreasing Lewis number.

Combustion Science and Technology (2017)

January 2018: We sadly mourn for Olaf Hasemann, who died after a serious illness on December 23rd, 2018

29.11.2017: Publication accepted in Fuel: P. Wollny,  B. Rogg, A. M. Kempf (2017), Modelling Heat Loss Effects in High Temperature Oxy-Fuel Flames with an Efficient and Robut Non-Premixed Flamelet Approach

26.10.2017: Publication accepted in Combustion Science and Technology: Dopazo, Cifuentes, Alwazzan, Chakraborty (2017), Influence of the Lewis number on effective strain rates in weakly turbulent premixed combustion

25.10.2017: Andreas Rittler has successfully passed his doctoral examination. Thesis "Large eddy simulation of nanoparticle synthesis from spray flames". Congratulations Andreas!

27.09.2017: Publication accepted in Fuel: M. Rieth, A.M. Kempf, A. Kronenburg, O.T. Stein (2017), Carrier-phase DNS of pulverized coal particle ignition and volatile burning in a turbulent mixing layer

23.08.2017: Nejra Sikalo has successfully passed his doctoral examination. Congratulations Nejra!

22.08.2017: Peter Janas has successfully passed his doctoral examination. Congratulations Peter!

17.08.2017: Publication accepted in Applied Optics: Mohri, K., Görs, S., Schöler, J., Rittler, A., Dreier, T., Schulz, C., Kempf, A. M. (2017), Instantaneous 3D- imaging of highly turbulent flames using Computed Tomography of Chemiluminescence (CTC)

25.07.2017: Minh Thuong Nguyen has successfully passed his doctoral examination. Congratulations Thuong!

02.06.2017: New bachelor and master projects are available. For more information, see Bachelor- & Master Projects.

28.04.2017: We have been awarded with a grant of 82 million core-hours to conduct massively parallel Direct Numerical Simulations and Large Eddy Simulations of turbulent premixed jet flames on SuperMUC at the Leibniz Supercomputing Centre. Project ID pr53fa. Coordinated by Dr.-Ing. Luis Cifuentes and Prof. Dr.-Ing. Andreas Kempf.

05.04.2017: Publication accepted in Physics of Fluids: „Vorticity budgets in premixed combusting turbulent flows at different Lewis numbers“ by Dopazo, Cifuentes, Chakraborty.

16.02.2017: New job vacancy as research associate on "Development and application of 3D tomographic techniques in engineering". For more information, see Open positions.

10.02.2017: Publication accepted for Combustion and Flame: „Flame resolved simulation of a turbulent premixed bluff-body burner experiment. Part II: A-priori and a-posteriori investigation of sub-grid scale wrinkling closures in the context of artificially thickened flame modeling“ by Proch, Domingo, Vervisch, Kempf

07.02.2017: Publication accepted for Combustion and Flame: „Flame resolved simulation of a turbulent premixed bluff-body burner experiment. Part I: Analysis of the reaction zone dynamics with tabulated chemistry“ by Proch, Domingo, Vervisch, Kempf

16.01.2017: Distinguished Paper Award for Martin Rieth: The manuscript "Flamelet LES modeling of coal combustion with detailed devolatilization by directly coupled CPD" by Rieth, Clements, Rabaçal, Proch, Stein and Kempf has been selected as the Distinguished Paper in the Solid Fuel Combustion colloquium for the 36th International Symposium on Combustion. Congratulations on this achievement!