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Vanishing limit for the three-dimensional incompressible Phan-Thien–Tanner system

Published online by Cambridge University Press:  27 March 2023

Yuhui Chen
Affiliation:
School of Aeronautics and Astronautics, Sun Yat-sen University, Guangzhou 510275, China (chenyh339@mail.sysu.edu.cn)
Minling Li
Affiliation:
School of Mathematics, Sun Yat-sen University, Guangzhou 510275, China (limling3@mail2.sysu.edu.cn)
Qinghe Yao
Affiliation:
School of Aeronautics and Astronautics, Sun Yat-sen University, Guangzhou 510275, China (yaoqhe@mail.sysu.edu.cn)
Zheng-an Yao
Affiliation:
School of Mathematics, Sun Yat-sen University, Guangzhou 510275, China (mcsyao@mail.sysu.edu.cn)

Abstract

This paper focuses on the vanishing limit problem for the three-dimensional incompressible Phan-Thien–Tanner (PTT) system, which is commonly used to describe the dynamic properties of polymeric fluids. Our purpose is to show the relation of the PTT system to the well-known Oldroyd-B system (with or without damping mechanism). The suitable a priori estimates and global existence of strong solutions are established for the PTT system with small initial data. Taking advantage of uniform energy and decay estimates for the PTT system with respect to time $t$ and coefficients $a$ and $b$, then allows us to justify in particular the vanishing limit for all time. More precisely, we prove that the solution $(u,\,\tau )$ of PTT system with $0\leq b\leq Ca$ converges globally in time to some limit $(\widetilde {u},\,\widetilde {\tau })$ in a suitable Sobolev space when $a$ and $b$ go to zero simultaneously (or, only $b$ goes to zero). We may check that $(\widetilde {u},\,\widetilde {\tau })$ is indeed a global solution of the corresponding Oldroyd-B system. In addition, a rate of convergence involving explicit norm will be obtained. As a byproduct, similar results are also true for the local a priori estimates in large norm.

Information

Type
Research Article
Copyright
Copyright © The Author(s), 2023. Published by Cambridge University Press on behalf of The Royal Society of Edinburgh

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