The generalized two phase flow CFD model (GENTOP)


The generalized two phase flow CFD model (GENTOP)

Lucas, D.; Hänsch, S.; Krepper, E.; Höhne, T.

In recent years many attempts were done to qualify CFD codes for multiphase flows. There is a clear progress e.g. for simulating dispersed bubbly or droplet flows on the one hand and stratified flows with large interfaces on the other hand. However many multiphase flows occurring in nature and technical applications are characterized by transitions between dispersed and continuous morphologies. Examples are bubble entrainment caused by plunging jets or by rolling waves. With presently available CFD-codes such transitions can be simulated only for some idealized cases. Simulations applying the multi-fluid model which is frequently applied for simulations on large technical systems provide some results for such transitions but they are rather caused by numerical effects than on physical basis. For this reason a new concept basing on the multi-fluid model and combining the previously developed MUSIG (Multi size bubble group model) and AIAD (Algebraic Interfacial Area Density) approaches was developed. It can be considered as a two-phase, three-field approach which includes a continuous liquid phase, one or more dispersed gas phases and a continuous gas phase. Transitions between dispersed and continuous gas phases are reflected by coalescence and breakup models. The paper presents the GENTOP concepts and simulations demonstrating the capabilities of the concept.

  • Lecture (Conference)
    6th Japanese - European Two-Phase Flow Group Meeting, 23.-27.09.2012, Kumamoto, Japan

Permalink: https://www.hzdr.de/publications/Publ-17887
Publ.-Id: 17887