Realizability improvements to a hybrid mixture-bubble model for simulation of cavitating flows
Journal article, 2018

Cavitating multi-phase flows include an extensive range of cavity structures with different length scales, from micro bubbles to large sheet cavities that may fully cover the surface of a device. To avoid high computational expenses, incompressible transport equation models are considered a practical option for simulation of large scale cavitating flows, normally with limited representation of the small scale vapour structures. To improve the resolution of all scales of cavity structures in these models at a moderate additional computational cost, a possible approach is to develop a hybrid Eulerian mixture -Lagrangian bubble solver in which the larger cavities are considered in the Eulerian framework and the small (sub-grid) structures are tracked as Lagrangian bubbles. A critical step in developing such hybrid models is the correct transition of the cavity structures from the Eulerian mixture to a Lagrangian discrete bubble framework. In this paper, such a multi-scale model for numerical simulation of cavitating flows is described and some encountered numerical issues for Eulerian–Lagrangian transition are presented. To address these issues, a new improved formulation is developed, and simulation results are presented that show the issues are overcome in the new model.

Disperse multiphase flow

Cavitating Flow

Multi-scale model

Author

Ebrahim Ghahramani

Chalmers, Mechanics and Maritime Sciences, Marine Technology

Mohammad Hossein Arabnejad Khanouki

Chalmers, Mechanics and Maritime Sciences, Marine Technology

Rickard Bensow

Chalmers, Mechanics and Maritime Sciences, Marine Technology

Computers and Fluids

0045-7930 (ISSN)

Vol. 174 135-143

Chalmers Area of Advance Transport - funding 2017

Chalmers, 2017-01-01 -- 2017-12-31.

Development and experimental validation of computational models for cavitating flows, surface erosion damage and material loss (CaFE)

European Commission (Horizon 2020), 2015-01-01 -- 2019-01-01.

Chalmers Area of Advance Transport - funding 2018

Chalmers, 2018-01-01 -- 2018-12-31.

Areas of Advance

Transport

Energy

Subject Categories

Applied Mechanics

Energy Engineering

Fluid Mechanics and Acoustics

Infrastructure

C3SE (Chalmers Centre for Computational Science and Engineering)

DOI

10.1016/j.compfluid.2018.06.025

More information

Latest update

1/14/2019