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The effect of interface gradient distribution on unrealistic flow in 3D droplet simulations

Title	The effect of interface gradient distribution on unrealistic flow in 3D droplet simulations
Author	Yılmaz, Anıl, Kayansalçik, Gökhan, Ertunç, Özgür
Publication Date:	2021-08-31
Publication Place	- Europe, Institute for Liquid Atomization and Spray Systems, ILASS
Subject	Drop dynamics, Gradient calculations, Multiphase flow, Parasitic current, VOF
Type	Document
Language	English
Digital	Yes
Manuscript	No
Library:	Özyeğin University
Library Asset ID	2-s2.0-85180802338
Record ID	aa2e40f1-af1a-4c8c-bc23-6b476477448d
Library Location	Mechanical Engineering
Date	2021-08-31
Notes	TÜBİTAK
Sample Text	The purpose of this study is to investigate the origin of the parasitic current to provide accurate prediction of droplet surface interactions in Volume of Fluid (VOF) framework. The deformation of the droplet due to parasitic current has been the most important problem in 3D simulations. Parasitic current is influenced by curvature and surface normal estimation in the Continuum Surface Force (CSF) model. It has been shown that the number of neighboring cells of the central cell influences the gradient calculations regarding the generation of parasitic current. It has been observed that the polyhedral cell structure delivers a smoother interface gradient distribution than the cartesian cell structure. To examine the dynamics in different physical conditions, we compared simulations with base experiments to understand whether those models work. We then simulated droplet cases on stationary and moving wall conditions, and simulation results were consistent with experimental results.

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Özyeğin University

The effect of interface gradient distribution on unrealistic flow in 3D droplet simulations

Author Yılmaz, Anıl, Kayansalçik, Gökhan, Ertunç, Özgür

Publication Date 2021-08-31

Publication Place - Europe, Institute for Liquid Atomization and Spray Systems, ILASS

Subject Drop dynamics, Gradient calculations, Multiphase flow, Parasitic current, VOF

Type Document

Language English

Digital Yes

Manuscript No

Library Özyeğin University

Library Asset ID 2-s2.0-85180802338

Record ID aa2e40f1-af1a-4c8c-bc23-6b476477448d

Library Location Mechanical Engineering

Date 2021-08-31

Notes TÜBİTAK

Sample Text The purpose of this study is to investigate the origin of the parasitic current to provide accurate prediction of droplet surface interactions in Volume of Fluid (VOF) framework. The deformation of the droplet due to parasitic current has been the most important problem in 3D simulations. Parasitic current is influenced by curvature and surface normal estimation in the Continuum Surface Force (CSF) model. It has been shown that the number of neighboring cells of the central cell influences the gradient calculations regarding the generation of parasitic current. It has been observed that the polyhedral cell structure delivers a smoother interface gradient distribution than the cartesian cell structure. To examine the dynamics in different physical conditions, we compared simulations with base experiments to understand whether those models work. We then simulated droplet cases on stationary and moving wall conditions, and simulation results were consistent with experimental results.