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arXiv 2103.15441math.APmath-phmath.MPphysics.flu-dyn
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线性化Boussinesq方程中行波的回波链

On echo chains in the linearized Boussinesq equations around traveling waves

Christian Zillinger

摘要:

我们考虑二维Boussinesq方程的粘性,但没有热耗散,并观察到在任何附近的Couette流和流体静力平衡(相对于当地规范)有时间依赖的行波解的形式$ω=-1+f(t)\cos(x-ty)$,$θ=αy + g(t)\sin(x-ty)$。作为我们的主要结果,我们表明,这些波周围的线性方程$α=0$表现出回声链和规范膨胀,尽管粘性耗散的速度。此外,我们构造的初始数据在一个临界Gevrey 3类,温度和涡度发散到无穷大的Sobolev正则性$t\rightarrow \infty$,但速度仍然收敛。

英文摘要:

We consider the 2D Boussinesq equations with viscous but without thermal dissipation and observe that in any neighborhood of Couette flow and hydrostatic balance (with respect to local norms) there are time-dependent traveling wave solutions of the form $ω=-1+f(t)\cos(x-ty)$, $θ=αy + g(t)\sin(x-ty)$. As our main result we show that the linearized equations around these waves for $α=0$ exhibit echo chains and norm inflation despite viscous dissipation of the velocity. Furthermore, we construct initial data in a critical Gevrey 3 class, for which temperature and vorticity diverge to infinity in Sobolev regularity as $t\rightarrow \infty$ but for which the velocity still converges.

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