Practical trainings, student assistants and theses

Application of baseline multiphase models to a new pipe flow data set (Id 276)

Student practical training / Bachelor theses / Master theses

Background:
For the CFD modelling of bubbly flows at the component-scale the two-fluid methodology has proven to be the most effective approach. For the various interfacial forces, turbulence sources and bubble coalescence and breakup processes a multitude of partly empirical closure models exist in the literature, each validated with the data from a particular experiment and a different flow configuration. The aim at the HZDR is to establish a single set of closure models that reflects local flow phenomena independent of the case investigated [1]. This set of baseline models should give the overall best agreement with the vast amount of data from various applications such as pipe flows, bubble columns or airlift reactors. The current set of baseline models has been established from the analysis of numerous cases that have already been added to an extensive case repository.
This set of baseline models should now be tested with a new TOPFLOW data set, which was recently produced at the HZDR [2]. The new experimental data includes measured liquid velocities and bubble sizes for the flow in a constricted vertical pipe. The goal of the project is to reproduce those new cases with the CFD-software OpenFOAM and to add them to our baseline repository.

Main tasks:
• Setting up a new TOPFLOW case in OpenFOAM
• Analysis of initial and boundary conditions
• Comparison of computed results with measured TOPFLOW data
• Use of the established setup on multiple TOPFLOW cases
• Adding the TOPFLOW cases to the baseline case repository
• Report and presentation of results

References:
[1] R. Rzehak et al., "Unified modeling of bubbly flows in pipes, bubble columns, and airlift columns," Chem. Eng. Sci. 157, pp. 147-158, 2017.
[2] M. Neumann-Kipping et al., "Investigations on bubbly two-phase flow in a constricted vertical pipe," Int. J. Multiph. Flow 2020 (submitted).

Department: Computational Fluid Dynamics

Requirements

• Experience using CFD software, preferably OpenFOAM
• Excellent written and verbal communication skills in English
• Team player (m/f/d) with a strong interest in multiphase flows

Conditions

Duration:
6 months

Links:

Online application

Please apply online: english / german

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