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Low Mach number limit for the global large solutions to the $2$D Navier--Stokes--Korteweg system in the critical $\widehat{L^p}$ framework

Mikihiro Fujii, Yang Li

Abstract

In the present paper, we consider the compressible Navier--Stokes--Korteweg system on the $2$D whole plane and show that a unique global solution exists in the scaling critical Fourier--Besov spaces for arbitrary large initial data provided that the Mach number is sufficiently small. Moreover, we also show that the global solution converges to the $2$D incompressible Navier--Stokes flow in the singular limit of zero Mach number. The key ingredient of the proof lies in the nonlinear stability estimates around the large incompressible flow via the Strichartz estimate for the linearized equations in Fourier--Besov spaces.

Low Mach number limit for the global large solutions to the $2$D Navier--Stokes--Korteweg system in the critical $\widehat{L^p}$ framework

Abstract

In the present paper, we consider the compressible Navier--Stokes--Korteweg system on the D whole plane and show that a unique global solution exists in the scaling critical Fourier--Besov spaces for arbitrary large initial data provided that the Mach number is sufficiently small. Moreover, we also show that the global solution converges to the D incompressible Navier--Stokes flow in the singular limit of zero Mach number. The key ingredient of the proof lies in the nonlinear stability estimates around the large incompressible flow via the Strichartz estimate for the linearized equations in Fourier--Besov spaces.

Paper Structure

This paper contains 8 sections, 14 theorems, 170 equations.

Table of Contents

  1. Introduction
  2. Preliminaries
  3. Function spaces
  4. Useful lemmas
  5. Linear estimates
  6. Proof of Theorem \ref{['thm']}
  7. Proof of Proposition \ref{['prop:lim']}
  8. Proof of Proposition \ref{['lemm:LWP-CNSK']}

Key Result

Theorem 1.1

Let $2 \leqslant p < 4$. Then, for any $a_0 \in \widehat{\dot{B}}{}_{p,1}^{\frac{2}{p}-1}(\mathbb{R}^2) \cap \widehat{\dot{B}}{}_{p,1}^{\frac{2}{p}}(\mathbb{R}^2)$ and $v_0 \in \widehat{\dot{B}}{}_{p,1}^{\frac{2}{p}-1}(\mathbb{R}^2)$, there exists a positive constant $\varepsilon_0=\varepsilon_0(p, with $\rho_{\varepsilon}(t,x) = 1 +\varepsilon a_{\varepsilon}(t,x) >0$. Moreover, for $p<q\leqslan

Theorems & Definitions (25)

  • Theorem 1.1
  • Remark 1.2
  • Lemma 2.1
  • Lemma 2.2
  • Lemma 2.3
  • Remark 2.4
  • Lemma 2.5
  • Lemma 2.6
  • proof
  • Lemma 3.1
  • ...and 15 more