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arXiv 2104.09901math.AP
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多维不可压缩流体动力学弱解的存在性

On the existence of weak solutions in the context of multidimensional incompressible fluid dynamics

Robert Lasarzik

摘要:

我们定义了Navier-Stokes方程和Euler方程的能量变分解的概念。潜在的相对能量不等式作为经典解的等式成立,并且如果附加变量为零,则这些解等价于具有强能量不等式的弱公式。通过在时间上引入一个额外的亏损变量,能量变分解的所有约束和所有连接都是能量变分解。通过最大耗散准则,选择出一个唯一的解,该解不仅连续依赖于数据,而且是唯一的弱解。

英文摘要:

We define the concept of energy-variational solutions for the Navier--Stokes and Euler equations. The underlying relative energy inequality holds as an equality for classical solutions and if the additional variable vanishes, these solutions are equivalent to the weak formulation with the strong energy inequality. By introducing an additional defect variable in time, all restrictions and all concatenations of energy-variational solutions are again energy-variational solutions. Via the criterion of maximal dissipation, a unique solution is selected that is not only continuously depending on the data but also turns out to be a unique weak solution.

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