Publications Repository - Helmholtz-Zentrum Dresden-Rossendorf

The HZDR multiphase addon contains additional code for the open-source CFD software OpenFOAM, released by The OpenFOAM Foundation. The developments are dedicated to the numerical simulation of multiphase flows, in particular to the multi-field two-fluid model (Euler-Euler method). Within the OpenFOAM library the multiphaseEulerFoam framework is used for this type of simulation. The addon contains a modified multiphaseEulerFoam named HZDRmultiphaseEulerFoam with the full support of the HZDR baseline model set for polydisperse bubbly flows according to Liao et al. (Chem Eng Sci, 2019, Vol. 202, 55-69). In addition a solver dedicated to a hybrid modelling approach (dispersed and resolved interfaces, Meller et al., Int J Numer Meth Fluids. 2020, 1-26) named cipsaMultiphaseEulerFoam is provided with the addon. This solver has an interface to the multiphaseEulerFoam framework and utilizes all available interfacial models of it.

General enhancements

• modified turbulent wall functions of Menter according to Rzehak and Kriebitzsch ( Int J Multiphase Flow, 2015, Vol. 68, 135-152)
• dynamic time step adjustment via PID controller

HZDRmultiphaseEulerFoam

• bubble induced turbulence model of Ma et al. (Phys Rev Fluids, 2017, Vol. 2, 034301)
• drag model of Ishii and Zuber (AIChE Journal, 1979, Vol. 25, 843-855) without correction for swarm and/or viscous effects
• wall lubrication of Hosokawa et al. (ASME Joint US-European Fluids Engineering Division Conference, 2002)
• additional breakup and coalescence models for class method according to Liao et al. (Chem Eng Sci, 2015, Vol. 122, 336-349)
• degassing boundary condition (fvOption)
• configuration files and tutorials for easy setup

cipsaMultiphaseEulerFoam

• morphology adaptive modeling framework for modelling of dispersed and resolved interfaces based on Eulerian multi-field two-fluid model
• compact interpolation method according to Cubero et al. (Comput Chem Eng, 2014, Vol. 62, 96-107), including virtual mass
• numerical drag according to Strubelj and Tiselj (Int J Numer Methods Eng, 2011, Vol. 85, 575-590) to describe resolved interfaces in a volume-of-fluid like manner
• n-phase partial elimination algorithm for momentum equations to resolve strong phase coupling
• free surface turbulence damping for k-ω SST (symmetric and asymmetric damping, Frederix et al., Nucl Eng Des, 2018, Vol. 333, 122-130)
• selected tutorial cases:
  • a two-dimensional gas bubble, rising in a liquid, which is laden with micro gas bubbles, and
  • a two-dimensional stagnant stratification of water and oil, sharing a large-scale interface
  • a two-dimensional stratified flow based on the experiment of Fabre et al. (Multiphase Sci Technol, 1987, Vol. 3, 285–301)