Publication detail

Surface Tension Model for High Viscosity Ratios implemented in VOF model

BOHÁČEK, J.

Czech title

Model povrchového napětí pro VOF model pro vysoké poměry viskozit

English title

Surface Tension Model for High Viscosity Ratios implemented in VOF model

Type

conference paper

Language

en

Original abstract

In this paper, a new surface tension model suitable for Volume of Fluid (VOF) model is introduced. The VOF model was designed many years ago in order to be solved by FVM. Nowadays, it is used in most of commercial CFD packages, e.g., ANSYS FLUENT, ANSYS CFX, and has the capability to simulate surface tension effects. However, when surface tension is dominant, i.e., Capillary or Weber number is low; it gives rather spurious cur-rents that can cripple a velocity field in a whole domain. In VOF, the interface between the primary and the sec-ondary phases is tracked on a fixed grid. In reality, surface tension acts as a surface force, however, here, it must be imposed as a body force into momentum equations.

Czech abstract

Tento příspěvek pojednává o novém modelu povrchového napětí určeného pro VOF model, který byl navržen pro metodu konečných objemů. Většina současných balíčků CFD umožňuje simulovat efekty sil od povrchového napětí, avšak pro nízká Weberova čísla dochází ke vzniku parazitních proudů , které výrazně ovlivňují celkové rychlostní pole. Byly testovány čtyři různé výstupy pro výpočet normál a křivostí mezifázového rozhraní. Dále byl navržen jiný způsob pro výpočet křivosti povrchu a zdrojový člen pro povrchové napětí do pohybových rovnic a byla zvážena implementace tohoto modelu do rovnic Predictor a Corector výpočtového algorytmu.

English abstract

In this paper, a new surface tension model suitable for Volume of Fluid (VOF) model is introduced. The VOF model was designed many years ago in order to be solved by FVM. Nowadays, it is used in most of commercial CFD packages, e.g., ANSYS FLUENT, ANSYS CFX, and has the capability to simulate surface tension effects. However, when surface tension is dominant, i.e., Capillary or Weber number is low; it gives rather spurious cur-rents that can cripple a velocity field in a whole domain. In VOF, the interface between the primary and the sec-ondary phases is tracked on a fixed grid. In reality, surface tension acts as a surface force, however, here, it must be imposed as a body force into momentum equations.

Keywords in Czech

povrchové napětí, VOF model, kapka, CSF model

Keywords in English

surface tension, VOF model, droplet, CSF model

RIV year

2010

Released

01.09.2010

ISBN

978-80-7399-997-1

Book

Proceedings of 23rd European Conference on Liquid Atomization and Spray Systems

Pages from–to

51–52

Pages count

2

BIBTEX


@inproceedings{BUT35432,
  author="Jan {Boháček},
  title="Surface Tension Model for High Viscosity Ratios implemented in VOF model",
  booktitle="Proceedings of 23rd European Conference on Liquid Atomization and Spray Systems",
  year="2010",
  month="September",
  pages="51--52",
  isbn="978-80-7399-997-1"
}