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arXiv 2109.08871math.AP
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二维Euler方程滤子解极限下的能量守恒

Energy conservation in the limit of filtered solutions for the 2D Euler equations

Takeshi Gotoda

摘要:

我们考虑能量守恒的二维不可压缩和无粘流通过弱解的过滤欧拉方程,它描述了一个正则化的欧拉流的基础上的空间过滤。我们证明了$L^p$,$p > 3/2$中带涡量的过滤弱解的能量耗散率在过滤参数的限制下收敛到零.虽然在整个空间中定义的能量一般不是有限的,我们正式提取一个依赖于时间的部分,这是定义良好的过滤解决方案,从能量和定义的能量耗散率作为其时间导数。此外,过滤的弱解的极限是欧拉方程的弱解,并且它满足分布意义下的局部能量平衡。对于$p = 3/2$的情形,我们通过假设Onsager的临界条件得到了与$p > 3/2$相同的结果.

英文摘要:

We consider energy conservation in a two-dimensional incompressible and inviscid flow through weak solutions of the filtered-Euler equations, which describe a regularized Euler flow based on a spatial filtering. We show that the energy dissipation rate for the filtered weak solution with vorticity in $L^p$, $p > 3/2$ converges to zero in the limit of the filter parameter. Although the energy defined in the whole space is not finite in general, we formally extract a time-dependent part, which is well-defined for filtered solutions, from the energy and define the energy dissipation rate as its time-derivative. Moreover, the limit of the filtered weak solution is a weak solution of the Euler equations and it satisfies a local energy balance in the sense of distributions. For the case of $p = 3/2$, we find the same result as $p > 3/2$ by assuming Onsager's critical condition for the family of the filtered solutions.

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