Quarterly of Applied Mathematics

Quarterly of Applied Mathematics

Online ISSN 1552-4485; Print ISSN 0033-569X

   
 
 

 

Energetic variational approaches for inviscid multiphase flow systems with surface flow and tension


Author: Hajime Koba
Journal: Quart. Appl. Math. 83 (2025), 159-188
MSC (2020): Primary 49Q20, 76-10, 35A15, 49S05
DOI: https://doi.org/10.1090/qam/1694
Published electronically: May 6, 2024
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Abstract: We consider the governing equations for the motion of the inviscid fluids in two moving domains and an evolving surface from an energetic point of view. We employ our energetic variational approaches to derive inviscid multiphase flow systems with surface flow and tension. More precisely, we calculate the variation of the flow maps to the action integral for our model to derive both surface flow and tension. We also study the conservation and energy laws of our multiphase flow systems. The key idea of deriving the pressure of the compressible fluid on the surface is to make use of the feature of the barotropic fluid, and the key idea of deriving the pressure of the incompressible fluid on the surface is to apply a generalized Helmholtz-Weyl decomposition on a closed surface. In Appendix, we introduce one of the candidates for the viscous terms of viscous multiphase flow with a tangential compressible surface flow.


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Additional Information

Hajime Koba
Affiliation: Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyamacho, Toyonaka, Osaka 560-8531, Japan
MR Author ID: 1013948
ORCID: 0000-0003-3116-4844
Email: koba.hajime.es@osaka-u.ac.jp

Keywords: Mathematical modeling, energetic variational approach, multiphase flow system, surface flow, surface tension, inviscid fluid
Received by editor(s): January 6, 2024
Received by editor(s) in revised form: March 31, 2024
Published electronically: May 6, 2024
Additional Notes: This work was partly supported by the Japan Society for the Promotion of Science (JSPS) KAKENHI Grant Number JP21K03326
Article copyright: © Copyright 2024 Brown University