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Stability of planar stationary solutions to the compressible Navier-Stokes equation on the half space. (English) Zbl 1117.35062
The authors consider the large-time behavior of solutions to the compressible Navier-Stokes equation: \(\partial_t\rho+\text{div}(\rho u)=0\), \(\partial_t(\rho u)+ \text{div}(\rho u\otimes u)+\nabla p(\rho)= u\Delta u+(\mu+\mu')\nabla \text{div}\,u\), and \(p(\rho)=K\rho^\gamma\), \(\gamma>1\), on the half-space \({\mathbb R}_+^n\) for \(n\geq 2\), under the initial condition \((\rho,u)| _{t=0}=(\rho_0,u_0)\) and the outflow boundary condition \(u| _{x_1=0}=(u_b^1,0,\dots,0)\), where \(u_b^1<0\) is a constant, together with the boundary condition \(\rho\rightarrow\rho_+\), \(u\rightarrow(u_b^1,0,\dots,0)\) as \(x_1\rightarrow\infty\), where \(\rho_+>0\) is a constant. It is shown by means of an a priori estimate that the planar stationary solution is stable with respect to small perturbations in \(H^s({\mathbb R}^n)\) with \(s\geq[n/2]+1\) and the perturbations decay in the \(L^\infty\) norm as \(t\rightarrow\infty\) provided the perturbations are sufficiently small.

35Q30 Navier-Stokes equations
76N10 Existence, uniqueness, and regularity theory for compressible fluids and gas dynamics
76E30 Nonlinear effects in hydrodynamic stability
35B35 Stability in context of PDEs
35B40 Asymptotic behavior of solutions to PDEs
Full Text: DOI
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