Contact
Dr. Fabian Schlegel
Head OpenFoam modelling of multiphase flows
f.schlegel
hzdr.de
Phone: +49 351 260 3467
Junior Research Group "Advanced modelling of multiphase flows"
Funding
The Junior Research Group is part of the project "Crossing borders and scales - an interdisciplinary approach (CROSSING)", which is funded by the Helmholtz Association of German Research Centres in the frame of the program „Helmholtz European Partnering“. The funding is granted for 5 years (2019 - 2023).
Partners
Jožef Stefan Institute (JSI): Computer Systems Department and Reactor Engineering Division
Helmholtz-Zentrum Dresden - Rossendorf (HZDR): Computational Fluid Dynamics
Motivation
The aim is to establish a long-term strategic partnership between HZDR and JSI in Slovenia and to conduct excellent research in the field of numerical simulations of multiphase flows.
The focus of the work is on numerical simulation of condensation-induced water hammers, which cause serious damage in industrial facilities. Despite the enormous progress in modelling of multiphase flows, condensation induced water hammers are a complex problem with many challenges. However, JSI and HZDR have a long expertise in this field and in the frame of the Junior Research Group the knowledge will be brought together.
The work is embedded into the OpenFOAM Foundation software activities at HZDR.
Work Packages
Qualification of OpenFOAM Foundation software for turbulent interfaces in two-fluid model
Similarly to modelling of interfacial flows, turbulent eddies are separated into large and small, sub-filter scales. In LES, large scale structures are resolved in space and time, while the small turbulent structures need modelling. In the framework of multiphase flows in a two-fluid model, additionally to the "classical" turbulent stress, a number of sub-filter scale contributions is present, which describe the dynamics and interaction of interfaces and turbulence. For these sub-filter contributions, different models and their combinations are assessed in a-posteriori investigations for application to technically relevant simulations.
Qualification of OpenFOAM Foundation software for stratified flows with heat and mass transfer
One of our goals is to advance the capabilities of current two-fluid (Euler-Euler) based modelling tools towards simulation of industrially relevant turbulent two-phase flows. Present work is focused on the development, implementation and validation of improved two-phase heat and mass transfer models for stratified flows. Advancement includes improvements concerning the treatment of interaction between gas-liquid interfaces and turbulence.
Develop and apply machine learning methods for population balance modelling
The inhomogeneous class method developed at HZDR and contributed to the OpenFOAM Foundation release allows for modelling of the size distribution of bubbles, droplets or fractal agglomerates. However, solving the population balance equation requires almost 90% of a time step in a numerical simulation. The implementation of a class method on graphical processor units (Cuda) and the application of suitable machine learning methods can lead to a significant reduction in computing time and due to that allow for more challenging and larger multiphase flow simulations.
Team
Group Leader
Dr. Fabian Schlegel, Computational Fluid Dynamics Department, Helmholtz-Zentrum Dresden - Rossendorf
Group Members
Dr. Matej Tekavčič, Postdoc, Reactor Engineering Division, Jožef Stefan Institute, Slovenia
Dr. Richard Meller, Postdoc, Computational Fluid Dynamics Department, Helmholtz-Zentrum Dresden - Rossendorf
Gašper Petelin, PhD, Computer Systems Department, Jožef Stefan Institute, Slovenia
Publications
- Meller, R.; Krull, B.; Schlegel, F. et al.
Numerical Transfer Towards Unresolved Morphology Representation in the MultiMorph Model
Nuclear Engineering and Design 428(2024), 113470 (10.1016/j.nucengdes.2024.113470) - Krull, B.; Meller, R.; Tekavcic, M. et al.
A filtering approach for applying the two-fluid model to gas-liquid flows on high resolution grids
Chemical Engineering Science 290(2024), 119909 (10.1016/j.ces.2024.119909) - Hänsch, S.; Draw, M.; Evdokimov, I. et al.
Multiphase Cases Repository by HZDR for OpenFOAM Foundation Software
Software in the HZDR data repository RODARE:
Publication date: 2024-08-22 Open access
DOI: 10.14278/rodare.811
Versions: 10.14278/rodare.3104 | 3056 | 3017 | 2322 | 2186 | 1925 | 1880 | 1049 | 927 | 812
License: CC-BY-4.0 - Schlegel, F.; Bilde, K. G.; Draw, M. et al.
Multiphase Code Repository by HZDR for OpenFOAM Foundation Software
Software in the HZDR data repository RODARE:
Publication date: 2024-08-22 Open access
DOI: 10.14278/rodare.767
Versions: 10.14278/rodare.3105 | 3055 | 3019 | 2321 | 2318 | 2185 | 1877 | 1869 | 1742 | 1496 | 1480 | 1195 | 1133 | 1125 | 1048 | 896 | 795 | 768
License: GPL-3.0-or-later - Wang, L.; Krull, B.; Meller, R. et al.
Simulation of droplet entrainment in annular flow with a morphology adaptive two-fluid model
Physics of Fluids 35(2023)10, 103312-1-103312-16 (10.1063/5.0169288) - Wiedemann, P.; Meller, R.; Schubert, M. et al.
Application of a hybrid multiphase CFD approach to the simulation of gas–liquid flow at a trapezoid fixed valve for distillation trays
Chemical Engineering Research and Design 193(2023), 777-786 (10.1016/j.cherd.2023.04.016) - Meller, R.; Tekavcic, M.; Krull, B. et al.
Momentum exchange modelling for coarsely resolved interfaces in a multifield two-fluid model
International Journal for Numerical Methods in Fluids 95(2023)9, 1521-1545 (10.1002/fld.5215) - Lyu, H.; Lucas, D.; Rzehak, R. et al.
Bubbly flow simulation with particle-center-averaged Euler-Euler model: Fixed polydispersity and bubble deformation
Chemical Engineering Research and Design 190(2023), 421-433 (10.1016/j.cherd.2022.12.033) - Lyu, H.; Schlegel, F.; Rzehak, R. et al.
Euler-Euler model of bubbly flow using particle-center-averaging method
Nuclear Science and Engineering 197(2023), 2602-2619 (10.1080/00295639.2022.2131344) - Yin, J.; Zhang, T.; Krull, B. et al.
A CFD approach for the flow regime transition in a gas-liquid vane-type separator
International Journal of Multiphase Flow 159(2023), 104320 (10.1016/j.ijmultiphaseflow.2022.104320) - Tai, C.-K.; Bolotnov, I.; Evdokimov, I. et al.
Development of machine learning framework for interface force closures based on bubble tracking data
Contribution to proceedings:
19th International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH-19), 06.-11.03.2022, Brüssel, Belgien
Proceedings of NURETH-19 - Tai, C.-K.; Bolotnov, I.; Evdokimov, I. et al.
Development of machine learning framework for interface force closures based on bubble tracking data
Nuclear Engineering and Design 399(2022), 112032 (10.1016/j.nucengdes.2022.112032) - Lyu, H.; Lucas, D.; Rzehak, R. et al.
A particle-center-averaged Euler-Euler model for monodisperse bubbly flows
Chemical Engineering Science 260(2022), 117943 (10.1016/j.ces.2022.117943) - Meller, R.; Schlegel, F.; Klein, M.
Sub-grid scale modelling and a-posteriori tests with a morphology adaptive multifield two-fluid model considering rising gas bubbles
Flow, Turbulence and Combustion 108(2022), 895-922 (10.1007/s10494-021-00293-8) - Schlegel, F.; Meller, R.; Krull, B. et al.
OpenFOAM hybrid - A Morphology Adaptive Multifield Two-fluid Model
Lecture (Conference):
19th International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH 19), 06.-11.03.2022, Brüssel, Belgien - Schlegel, F.; Meller, R.; Krull, B. et al.
OpenFOAM hybrid - A Morphology Adaptive Multifield Two-fluid Model
Contribution to proceedings:
19th International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH-19), 06.-11.03.2022, Brüssel, Belgien
Proceedings of the 19th International Topical Meeting on Nuclear Reactor Thermal Hydraulics - Schlegel, F.; Meller, R.; Krull, B. et al.
OpenFOAM hybrid - A Morphology Adaptive Multifield Two-fluid Model
Nuclear Science and Engineering 197(2022)10, 2620-2633 (10.1080/00295639.2022.2120316) - Lehnigk, R.; Bainbridge, W.; Liao, Y. et al.
An open-source population balance modeling framework for the simulation of polydisperse multiphase flows
AIChE Journal 68(2022)3, e17539 (10.1002/aic.17539) - Hänsch, S.; Evdokimov, I.; Schlegel, F. et al.
A workflow for the sustainable development of closure models for bubbly flows
Chemical Engineering Science 244(2021), 116807 (10.1016/j.ces.2021.116807) - Rzehak, R.; Liao, Y.; Meller, R. et al.
Radial pressure forces in Euler-Euler simulations of turbulent bubbly pipe flows
Nuclear Engineering and Design 374(2021), 111079 (10.1016/j.nucengdes.2021.111079) - Tekavčič, M.; Meller, R.; Schlegel, F.
Validation of a morphology adaptive multi-field two-fluid model considering counter-current stratified flow with interfacial turbulence damping
Nuclear Engineering and Design 379(2021), 111223 (10.1016/j.nucengdes.2021.111223) - Meller, R.; Schlegel, F.; Lucas, D.
Basic verification of a numerical framework applied to a morphology adaptive multi-field two-fluid model considering bubble motions
International Journal for Numerical Methods in Fluids 93(2021)3, 748-773 (10.1002/fld.4907) - Meller, R.; Schlegel, F.; Lucas, D. et al.
Numerical framework for a morphology adaptive multi-field two-fluid model in OpenFOAM
Software in the HZDR data repository RODARE:
Publication date: 2020-04-06 Open access
DOI: 10.14278/rodare.286
Versions: 10.14278/rodare.713 | 287
License: GPL-3.0-only - Liao, Y.; Upadhyay, K.; Schlegel, F.
Eulerian-Eulerian two-fluid model for laminar bubbly pipe flows: validation of the baseline model
Computers & Fluids 202(2020), 104496 (10.1016/j.compfluid.2020.104496)
