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research-article

Coalescence Prevention Algorithm for Level Set Method

[+] Author and Article Information
Matthew L. Talley

North Carolina State University Nuclear Engineering Department 3140 Burlington Engineering Labs, 2500 Stinson Drive, Raleigh, NC 27695
mltalle2@ncsu.edu

Matthew D. Zimmer

North Carolina State University Nuclear Engineering Department 3140 Burlington Engineering Labs, 2500 Stinson Drive, Raleigh, NC 27695
mdzimmer@ncsu.edu

Igor A Bolotnov

North Carolina State University Nuclear Engineering Department 3140 Burlington Engineering Labs, 2500 Stinson Drive, Raleigh, NC 27695
Igor_bolotnov@ncsu.edu

1Corresponding author.

ASME doi:10.1115/1.4036246 History: Received August 01, 2016; Revised February 21, 2017

Abstract

An algorithm to prevent or delay bubble coalescence for the Level Set (LS) method is presented. This novel algorithm uses the LS method field to detect when bubbles are in close proximity, indicating a potential coalescence event, and applies a repellent force to simulate the unresolved liquid drainage force. The model is introduced by locally modifying the surface tension force near the liquid film drainage area. The algorithm can also simulate the liquid drainage time of the thin film by controlling the length of time the increased surface tension has been applied. Thus a new method of modeling bubble coalescence has been developed. Several test cases were designed to demonstrate the capabilities of the algorithm. The simulations, including a mesh study, confirmed the abilities to identify and prevent coalescence as well as implement the time tracking portion, with an additional 10-25% computational cost. Ongoing tests aim to verify the algorithm’s functionality for simulations with different flow conditions, a ranging number of bubbles, and both structured and unstructured computational mesh types. Specifically, a bubble rising towards a free surface provides a test of performance and demonstrates the ability to consistently prevent coalescence. In addition, a two bubble case and a seven bubble case provide a more complex demonstration of how the algorithm performs for larger simulations. These cases are compared to much more expensive simulations capable of resolving the liquid film drainage (through very high local mesh resolution), to investigate how the algorithm replicates the liquid film drainage process.

Copyright (c) 2017 by ASME
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