Journal
ARCHIVE FOR RATIONAL MECHANICS AND ANALYSIS
Volume 200, Issue 3, Pages 1075-1097Publisher
SPRINGER
DOI: 10.1007/s00205-010-0384-9
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Funding
- NSF [DMS-0908175, DMS-0801319]
- Direct For Mathematical & Physical Scien
- Division Of Mathematical Sciences [0908175] Funding Source: National Science Foundation
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Consider inviscid fluids in a channel {-1 <= y <= 1}. For the Couette flow u (0) = (y, 0), the vertical velocity of solutions to the linearized Euler equation at u (0) decays in time. Whether the same happens at the non-linear level is an open question. Here we study issues related to this problem. First, we show that in any (vorticity) H(s) (S < 3/2) neighborhood of Couette flow, there exist non-parallel steady flows with arbitrary minimal horizontal periods. This implies that nonlinear inviscid damping is not true in any (vorticity) H(s) (S < 3/2) neighborhood of Couette flow for any horizontal period. Indeed, the long time behaviors in such neighborhoods are very rich, including nontrivial steady flows and stable and unstable manifolds of nearby unstable shears. Second, in the (vorticity) H(s) (S < 3/2) neighborhoods of Couette flow, we show that there exist no non-parallel steadily travelling flows v(x-ct, y) , and no unstable shears. This suggests that the long time dynamics in H(s) (S < 3/2) neighborhoods of Couette flow might be much simpler. Such contrasting dynamics in H (s) spaces with the critical power s=3/2 is a truly nonlinear phenomena, since the linear inviscid damping near Couette flow is true for any initial vorticity in L (2).
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