Work

Optimal convergence of the arbitrary Lagrangian–Eulerian interface tracking method for two-phase Navier–Stokes flow without surface tension

Year: 2025

Type: article

Abstract: Optimal-order convergence in the $H^{1}$ norm is proved for an arbitrary Lagrangian–Eulerian (ALE) interface tracking finite element method (FEM) for the sharp interface model of two-phase Navier–Stokes flow without surface tension, using high-order curved evolving mesh. In this method, the interfacial mesh points move with the fluid’s velocity to track the sharp interface between two phases of the fluid, and the interior mesh points move according to a harmonic extension of the interface velocity. The error of the semidiscrete ALE interface tracking FEM is shown to be $O(h^{k})$ in the $L^\infty (0, T; H^{1}(\varOmega ))$ norm for the Taylor–Hood finite elements of degree $k \geqslant 2$. This high-order convergence is achieved by utilizing the piecewise smoothness of the solution on each subdomain occupied by one phase of the fluid, relying on a low global regularity on the entire moving domain. Numerical experiments illustrate and complement the theoretical results.

Source: IMA Journal of Numerical Analysis

DOI: 10.1093/imanum/draf003

Authors: Buyang Li, Shu Ma, Weifeng Qiu

Institutions: Hong Kong Polytechnic University, City University of Hong Kong

Language: English

Topic: Advanced Numerical Methods in Computational Mathematics

Subfield: Computational Mechanics

Field: Engineering

Domain: Physical Sciences

Open Access status: green

Funders: City University of Hong Kong, National Natural Science Foundation of China, Hong Kong Polytechnic University

Award: G2539936543