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Acoustics simulation in the presence of moving interfaces in multiphase flows

Friedrich, Jonas and Schäfer, Michael (2019):
Acoustics simulation in the presence of moving interfaces in multiphase flows.
In: Proceedings of 6th European Conference on Computational Mechanics (ECCM 6) / 7th European Conference on Computational Fluid Dynamics (ECFD 7), In: 6th European Conference on Computational Mechanics (ECCM 6) / 7th European Conference on Computational Fluid Dynamics (ECFD 7), Glasgow, UK, 11.06.2018 - 15.06.2018, ISBN 978-84-947311-6-7,
[Online-Edition: http://congress.cimne.com/eccm_ecfd2018/frontal/docs/Ebook-G...],
[Conference or Workshop Item]

Abstract

Numerical simulations can help to understand the mechanisms of sound producing sources. In this work a numerical scheme for calculating surface tension dominated multiphase flows coupled with acoustics is presented. The Volume-of-Fluid (VOF) method is used to calculate the incompressible multiphase flow. Surface tension is taken into account by the Continuum Surface Force (CSF) method. An Expansion about Incompressible Flow (EIF) approach using the Linearized Euler Equations (LEE) is employed for the acoustics. The LEE are valid in each phase independently of the material parameters, but not at the interface. When the interface moves, unphysical acoustic sources arise. An approach which suppresses the sources in the interface region is applied. Comparing the new approach with the unchanged LEE in a moving drop test case, it is shown that the parasitic sound vanishes. An elliptic drop oscillating in a resting background flow serves as a second test case, in which the moving interface has to produce sound. A good agreement under 2.5% between the frequencies of the oscillation and the acoustic pressure emitted by the drop is achieved.

Item Type: Conference or Workshop Item
Erschienen: 2019
Creators: Friedrich, Jonas and Schäfer, Michael
Title: Acoustics simulation in the presence of moving interfaces in multiphase flows
Language: English
Abstract:

Numerical simulations can help to understand the mechanisms of sound producing sources. In this work a numerical scheme for calculating surface tension dominated multiphase flows coupled with acoustics is presented. The Volume-of-Fluid (VOF) method is used to calculate the incompressible multiphase flow. Surface tension is taken into account by the Continuum Surface Force (CSF) method. An Expansion about Incompressible Flow (EIF) approach using the Linearized Euler Equations (LEE) is employed for the acoustics. The LEE are valid in each phase independently of the material parameters, but not at the interface. When the interface moves, unphysical acoustic sources arise. An approach which suppresses the sources in the interface region is applied. Comparing the new approach with the unchanged LEE in a moving drop test case, it is shown that the parasitic sound vanishes. An elliptic drop oscillating in a resting background flow serves as a second test case, in which the moving interface has to produce sound. A good agreement under 2.5% between the frequencies of the oscillation and the acoustic pressure emitted by the drop is achieved.

Title of Book: Proceedings of 6th European Conference on Computational Mechanics (ECCM 6) / 7th European Conference on Computational Fluid Dynamics (ECFD 7)
ISBN: 978-84-947311-6-7
Divisions: 16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Institute of Numerical Methods in Mechanical Engineering (FNB)
Event Title: 6th European Conference on Computational Mechanics (ECCM 6) / 7th European Conference on Computational Fluid Dynamics (ECFD 7)
Event Location: Glasgow, UK
Event Dates: 11.06.2018 - 15.06.2018
Date Deposited: 30 Oct 2019 08:11
Official URL: http://congress.cimne.com/eccm_ecfd2018/frontal/docs/Ebook-G...
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