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Minsuk Yang

Publications and source records attributed to Minsuk Yang.

At least 19 recordsLinked to original sources
arXiv2025

Global existence of solutions of the stochastic incompressible non-Newtonian fluid models

In this paper, we study the existence of solutions of stochastic incompressible non-Newtonian fluid models in $\mathbb{R}$. For the existence of solutions, we assume that the extra stress tensor $S$ is represented by $S({\mathbb A}) = {\mathbb F} ( {\mathbb A}) {\mathbb A}$ for $ n \times n$ matrix ${\mathbb G}$. We assume that ${\mathbb F}(0) $ is uniformly elliptic matrix and \begin{align*} |{\mathbb F}({\mathbb G})|, \,\, | D {\mathbb F} ({\mathbb G})|, \,\, | D^2({\mathbb F} ({\mathbb G}) ){\mathbb G}| \leq c \quad \mbox{for all} \quad 0 < |{\mathbb G}| \leq r_0 \end{align*} for some $r_0 > 0$. Note that ${\mathbb F}_1$ and ${\mathbb F}_2$ for $ d \in {\mathbb R}$, and ${\mathbb F}_3$ for $d \geq 3$ introduced in (1.2) satisfy our assumption.

math.AP↗
arXiv2024

On the multicomponent reactive flows in moving domains

This paper is concerned with the existence of global-in-time weak solutions to the multicomponent reactive flows inside a moving domain whose shape in time is prescribed. The flow is governed by the 3D compressible Navier-Stokes-Fourier system coupled with the equations of species mass fractions. The fluid velocity is supposed to fulfill the complete slip boundary condition, whereas the heat flux and species diffusion fluxes satisfy the conservative boundary conditions. The existence of weak solutions is obtained by means of suitable approximation techniques. To this end, we need to rigorously analyze the penalization of the boundary behavior, viscosity and the pressure in the weak formulation.

math.AP↗
arXiv2024

New Liouville-type theorem for the stationary tropical climate model

We study the Liouville-type theorem for smooth solutions to the steady 3D tropical climate model. We prove the Liouville-type theorem if a smooth solution satisfies a certain growth condition in terms of $L^p$-norm on annuli, which improves the previous results, Theorem 1.1 (Math. Methods Appl. Sci. 44, 2021) by Ding and Wu, and Theorem 1.1 and Theorem 1.2 (Appl. Math. Lett. 138, 2023) by Yuan and Wang.

math.AP↗
arXiv2023

An improved Liouville-type theorem for the stationary tropical climate model

In this paper, we study the Liouville-type property for smooth solutions to the steady 3D tropical climate model. We prove that if a smooth solution $(u,v,θ)$ satisfies $u \in L^3 (\mathbb{R}^3)$, $v \in L^2 (\mathbb{R}^3)$, and $\nabla θ\in L^2 (\mathbb{R}^3)$, then $u=v=0$ and $θ$ is constant, which improves the previous result, Theorem 1.3 (Math. Methods Appl. Sci. 44, 2021) by Ding and Wu.

math.AP↗
arXiv2017

Blow up criteria for the compressible Navier--Stokes equations

We study the strong solution to the 3-D compressible Navier--Stokes equations. We propose a new blow up criterion for barotropic gases in terms of the integral norm of density $ρ$ and the divergence of the velocity $\bu$ without any restriction on the physical viscosity constants. Our blow up criteria can be seen as a partial realization of the underlying principle that the higher integrability implies the boundedness and then eventual regularity. We also present similar blow up criterion for the heat conducting gases.

math.AP↗
arXiv2017

Local kinetic energy and singularities of the incompressible Navier--Stokes Equations

We study the partial regularity problem of the incompressible Navier--Stokes equations. In this paper, we show that a reverse Hölder inequality of velocity gradient with increasing support holds under the condition that a scaled functional corresponding the local kinetic energy is uniformly bounded. As an application, we give a new bound for the Hausdorff dimension and the Minkowski dimension of singular set when weak solutions $v$ belong to $L^\infty(0,T;L^{3,w}(\mathbb{R}^3))$ where $L^{3,w}(\mathbb{R}^3)$ denotes the standard weak Lebesgue space.

math.AP↗
arXiv2017

Fundamental solutions for stationary Stokes systems with measurable coefficients

We establish the existence and the pointwise bound of the fundamental solution for the stationary Stokes system with measurable coefficients in the whole space $\mathbb{R}^d$, $d \ge 3$, under the assumption that weak solutions of the system are locally Hölder continuous. We also discuss the existence and the pointwise bound of the Green function for the Stokes system with measurable coefficients on $Ω$, where $Ω$ is an unbounded domain such that the divergence equation is solvable. Such a domain includes, for example, half space and an exterior domain.

math.AP↗
arXiv2016

On regularity and singularity for $L^\infty(0,T;L^{3,w}(\mathbb{R}^3))$ solutions to the Navier-Stokes equations

We study local regularity properties of a weak solution $u$ to the Cauchy problem of the incompressible Navier-Stokes equations. We present a new regularity criterion for the weak solution $u$ satisfying the condition $L^\infty(0,T;L^{3,w}(\mathbb{R}^3))$ without any smallness assumption on that scale, where $L^{3,w}(\mathbb{R}^3)$ denotes the standard weak Lebesgue space. As an application, we conclude that there are at most a finite number of blowup points at any singular time $t$. The condition that the weak Lebesgue space norm of the veclocity field $u$ is bounded in time is encompassing type I singularity and significantly weaker than the end point case of the so-called Ladyzhenskaya-Prodi-Serrin condition proved by Escauriaza-Sergin-Šverák.

math.AP↗
arXiv2016

A new local regularity criterion for suitable weak solutions of the Navier--Stokes equations in terms of the velocity gradient

We study the partial regularity of suitable weak solutions to the three dimensional incompressible Navier--Stokes equations. There have been several attempts to refine the Caffarelli--Kohn--Nirenberg criterion (1982). We present an improved version of the CKN criterion with a direct method, which also provides the quantitative relation in Seregin's criterion (2007).

math.AP↗
arXiv2016

A parabolic Triebel-Lizorkin space estimate for the fractional Laplacian operator

In this paper we prove a parabolic Triebel-Lizorkin space estimate for the operator given by \[T^αf(t,x) = \int_0^t \int_{{\mathbb R}^d} P^α(t-s,x-y)f(s,y) dyds,\] where the kernel is \[P^α(t,x) = \int_{{\mathbb R}^d} e^{2πix\cdotξ} e^{-t|ξ|^α} dξ.\] The operator $T^α$ maps from $L^{p}F_{s}^{p,q}$ to $L^{p}F_{s+α/p}^{p,q}$ continuously. It has an application to a class of stochastic integro-differential equations of the type $du = -(-Δ)^{α/2} u dt + f dX_t$.

math.CA↗