Fully discrete finite element approximation for the projection method to solve the Chemotaxis-Fluid System

TL;DR

This paper presents a new fully discrete finite element scheme for simulating chemotaxis-fluid interactions, combining stability, accuracy, and convergence analysis validated by numerical experiments.

Contribution

It introduces a pressure-correction projection finite element method with rigorous error estimates for the coupled chemotaxis-fluid system.

Findings

The scheme is stable and accurate for simulating chemotaxis-fluid dynamics.

Error estimates demonstrate convergence of the numerical method.

Numerical experiments confirm the method captures key behaviors of the system.

Abstract

In this paper, we investigate a chemotaxis-fluid interaction model governed by the incompressible Navier-Stokes equations coupled with the classical Keller-Segel chemotaxis system. To numerically solve this coupled system, we develop a pressure-correction projection finite element method based on a projection framework. The proposed scheme employs a backward Euler method for temporal discretization and a mixed finite element method for spatial discretization. Nonlinear terms are treated semi-implicitly to enhance computational stability and efficiency. We further establish rigorous error estimates for the fully discrete scheme, demonstrating the convergence of the numerical method. A series of numerical experiments are conducted to validate the stability, accuracy, and effectiveness of the proposed method. The results confirm the scheme's capability to capture the essential dynamical behaviors and characteristic features of the chemotaxis-fluid system.