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Yoshiyuki Kagei

Publications and source records attributed to Yoshiyuki Kagei.

9 recordsLinked to original sources
arXiv2026

Enhanced Dissipation and Global Well-Posedness for a Three-Dimensional Flame Propagation Model with Couette Flow

We study a three-dimensional gravity-induced flame front model under a Couette flow. By exploiting the enhanced dissipation induced by the Couette flow, we prove global-in-time well-posedness of the Cauchy problem in $\mathbb{R}^3$ and derive decay estimates for the solution and its spatial derivatives in $L^p$ norms for all $p \ge 1$. The analysis is based on a Green's function approach for the associated variable-coefficient linearized operator. Since an explicit representation of the Green's function is unavailable, we first establish decay estimates in the spectral domain and then transfer them to physical space. These results show that enhanced dissipation induced by the Couette flow is the key mechanism leading to global existence in the whole space, in the large initial data regime.

math.AP↗
arXiv2024

Existence and stability of time periodic solutions to nonlinear elastic wave equations with viscoelastic terms

Existence and stability of time periodic solutions for nonlinear elastic wave equations with viscoelastic terms are established. The existence of the time periodic solution is proved using the spectral decomposition of the linear principal part and the Poincaré map. On the other hand, the proof of the stability of the time-periodic solutions is generally problematic due to the slow time decay induced by the time periodic solutions. Based on the regularity estimates of the time periodic solution derived from the smoothing effect of the semigroup, sharp decay properties of the perturbation from the time periodic solution are proved, which proves the stability.

math.AP↗
arXiv2024

Asymptotic behavior of solution of the non-resistive 2D MHD equations on the half space

In this paper, we obtain the global well-posedness and the asymptotic behavior of solution of non-resistive 2D MHD problem on the half space. We overcome the difficulty of zero spectrum gap by building the relationship between half space and the whole space, and get the resolvent estimate for the weak diffusion system. We use the two-tier energy method that couples the boundedness of high-order $(H^3)$ energy to the decay of low-order energy, the latter of which is necessary to control the growth of the highest energy.

math.AP↗
arXiv2021

Smoothing effect and asymptotic behavior of solutions to nonlinear elastic wave equations with viscoelastic terms in the framework of $L^{p}$-Sobolev spaces

The Cauchy problem for nonlinear elastic wave equations with viscoelastic damping terms is investigated in $L^{p}$ framework. It is proved that the small global solutions constructed in $L^{2}$-Sobolev spaces in our preceding paper [12] satisfies consistency property corresponding to the additional regularity of the initial data. As a result, sharp estimates in $t$ and approximation formulas by the diffusion waves are established.

math.AP↗
arXiv2021

On the spectral properties for the linearized problem around space-time periodic states of the compressible Navier-Stokes equations

This paper studies the linearized problem for the compressible Navier-Stokes equation around space-time periodic state in an infinite layer of $\mathbb{R}^n$ ($n=2,3$), and the spectral properties of the linearized evolution operator is investigated. It is shown that if the Reynolds and Mach numbers are sufficiently small, then the asymptotic expansions of the Floquet exponents near the imaginary axis for the Bloch transformed linearized problem are obtained for small Bloch parameters, which would give the asymptotic leading part of the linearized solution operator as $t\rightarrow\infty$.

math.AP↗
arXiv2021

Singular limit in Hopf bifurcation for doubly diffusive convection equations I: linearized analysis at criticality

A singularly perturbed system for doubly diffusive convection equations, called the artificial compressible system, is considered on a two-dimensional infinite layer for a parameters range where the Hopf bifurcation occurs in the corresponding incompressible system. The spectrum of the linearized operator in a time periodic function space is investigated in detail near the bifurcation point when the singular perturbation parameter is small. The results of this paper are the basis of the study of the nonlinear Hopf bifurcation problem and the singular limit of the time periodic bifurcating solutions.

math.AP↗
arXiv2021

Singular limit in Hopf bifurcation for doubly diffusive convection equations II: bifurcation and stability

A singular perturbation problem from the artificial compressible system to the incompressible system is considered for a doubly diffusive convection when a Hopf bifurcation from the motionless state occurs in the incompressible system. It is proved that the Hopf bifurcation also occurs in the artificial compressible system for small singular perturbation parameter, called the artificial Mach number. The time periodic solution branch of the artificial compressible system is shown to converge to the corresponding bifurcating branch of the incompressible system in the singular limit of vanishing artificial Mach number.

math.AP↗
arXiv2015

The Oberbeck--Boussinesq Approximation as a Constitutive Limit

We derive the usual Oberbeck--Boussinesq approximation as a constitutive limit of the full system describing the motion of an compressible linearly viscous fluid. To this end the starting system is written, using the Gibbs free energy, in the variables $\mathbf v, θ$ and $p$. The Oberbeck--Boussinesq system is then obtained as the thermal expansion coefficient $α$ and the isothermal compressibility coefficient $β$ tend to zero.

math-ph↗