Computational Fluid Dynamics

The activities of the CFD department focus on:

• The CFD-model development and validation for multiphase flows
  • for medium and large scale industrial applications
  • basing on the multi-fluid approach.
• Dedicated experiments as well as DNS / LES aiming on the development and validations of closure models.

Keywords

AIAD, air conditioning, baseline models, boiling, breakup, bubble-induced turbulence, chemical reaction, coalescence, condensation, conference, critical heat flux, density driven flows, evaporation, experiments, flashing, flotation, flows in fuel elements, fuel element storage pools, GENTOP, iClass, iMUSIG, Junior Research Group, liquid metal bubbly flows, manifolds, MultiMorph Model, OpenFOAM, OpenFOAM_RCS, phase transfer, poly-disperse bubbly flows, population balance modelling, rotational flows, short course, three phase flows, transport of isolation materials, vertical pipe flows, wall boiling

Research

Motivation and Strategy

The qualification of multiphase CFD-models in frame of the multi-fluid approach requires some consolidation. For the extension of the applicability new concepts are established.

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Baseline-Modell für polydisperse Blasenströmungen – iMUSIG

One focus of the ongoing activities is the further development of the baseline model for poly-disperse bubbly flows. The inhomogeneous MUSIG model (iMUSIG) provides a suitable modelling framework while the closure models including all ­para­meters are well defined.

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Baseline model for se­parated flows – AIAD

Se­parated flows, i.e. flow with large gas-liquid-interfaces occur frequently in horizontal flow domains (stratification), but are also observed in other configurations as e.g. annular flow in ­vertical pipes.

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GENeralized TwO-Phase flow concept – GENTOP

In many gas-liquid flows with relevance for applications different morpho­logies of the interfacial structure (disperse or segregated) occur in ­parallel and transitions between these morpho­logies have to be considered. The innovative GENTOP-concept is a good basis for the simulation of such flows.

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Modelling of Multiphase Flows with OpenFOAM Foundation Software

Within this project the main developments for the numerical simulation of multiphase flows at Helmholtz-Zentrum Dresden-Rossendorf are transferred to the OpenFOAM Foundation software. The complete access to the source code, in contrast to commercial CFD software, give rise to much more possibilities concerning the development of new physical models and simulation methods.

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Applications and projects

Our activities aim on the qualification of multiphase CFD-methods as a tool for the optimization of industrial ap­paratuses and processes as well for safety analyses. Some examples for applications and projects are given here.

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Junior Research Group "Advanced modelling of multiphase flows"

The Junior Research Group ist founded by the Helmholtz European Partnering Programm and is a cooperation between Helmholtz-Zentrum Dresden - Rossendorf and Jožef Stefan Institute in Slovenia. The topic is modelling and numerical simulation of complex multiphase flows, e.g. water hammers.

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Junior research group: Bubbles go with turbulent flows

We are interested in solving fundamental and applied problems related to turbulence and bubble transport in environmental and industrial flows. We use experiments (mostly) of bubble-laden turbulent flows to understand how the bubbles modify the multiscale properties of the turbulent flows, as well as the motion of the bubbles themselves.

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