Linear stability analysis of the homogeneous Couette flow in a 2D isentropic compressible fluid

Annals of PDE - Tập 7 Số 2 - 2021
Paolo Antonelli1, Michele Dolce2, Pierangelo Marcati1
1GSSI - Gran Sasso Science Institute, Viale Francesco Crispi 7, 67100, L’Aquila, Italy
2Department of Mathematics, Imperial College London, London, SW7 2AZ, UK

Tóm tắt

AbstractIn this paper, we study the linear stability properties of perturbations around the homogeneous Couette flow for a 2D isentropic compressible fluid in the domain$$\mathbb {T}\times \mathbb {R}$$T×R. In the inviscid case there is a generic Lyapunov type instability for the density and the irrotational component of the velocity field. More precisely, we prove that their$$L^2$$L2norm grows as$$t^{1/2}$$t1/2and this confirms previous observations in the physics literature. On the contrary, the solenoidal component of the velocity field experiences inviscid damping, namely it decays to zero even in the absence of viscosity. For a viscous compressible fluid, we show that the perturbations may have a transient growth of order$$\nu ^{-1/6}$$ν-1/6(with$$\nu ^{-1}$$ν-1being proportional to the Reynolds number) on a time-scale$$\nu ^{-1/3}$$ν-1/3, after which it decays exponentially fast. This phenomenon is also called enhanced dissipation and our result appears to be the first to detect this mechanism for a compressible flow, where an exponential decay for the density is not a priori trivial given the absence of dissipation in the continuity equation.

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Tập 7 Số 2

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