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arXiv 1111.4381math.AP
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Riesz型不等式与最大通量交换流

Riesz-type inequalities and maximum flux exchange flow

I E McGillivray

摘要:

令$D$表示$\mathbb{R}^d$($d\geq 1$)中的开单位圆盘,$(D,\,\mathscr{B},\,m)$表示$D$上的通常勒贝格测度空间。令$\mathscr{H}$表示具有标准内积$(\cdot,\,\cdot)$的实希尔伯特空间$L^2(D,\,m)$。字母$G$表示$\mathscr{H}$中的(非负)狄利克雷拉普拉斯算子$-Δ$的格林算子,$ψ$表示挠函数$G\,χ_D$。我们提出以下问题。确定形状优化问题\[ α_t:=\sup\Big\{(Gχ_A,χ_A):\,A\subseteq D\text{is open and}(ψ,χ_A)\leq t\,\Big\} \]的优化器,其中参数$t$位于范围$0<t<(ψ,1)$内。我们回答这个问题的一维情况下$d=1$。我们将其应用到一个问题,连接到最大通量交换流在垂直管道。我们还表明存在的优化的放松版本的上述变分问题,并得出一些对称性的解决方案。

英文摘要:

Let $D$ stand for the open unit disc in $\mathbb{R}^d$ ($d\geq 1$) and $(D,\,\mathscr{B},\,m)$ for the usual Lebesgue measure space on $D$. Let $\mathscr{H}$ stand for the real Hilbert space $L^2(D,\,m)$ with standard inner product $(\cdot,\,\cdot)$. The letter $G$ signifies the Green operator for the (non-negative) Dirichlet Laplacian $-Δ$ in $\mathscr{H}$ and $ψ$ the torsion function $G\,χ_D$. We pose the following problem. Determine the optimisers for the shape optimisation problem \[ α_t:=\sup\Big\{(Gχ_A,χ_A):\,A\subseteq D\text{is open and}(ψ,χ_A)\leq t\,\Big\} \] where the parameter $t$ lies in the range $0<t<(ψ,1)$. We answer this question in the one-dimensional case $d=1$. We apply this to a problem connected to maximum flux exchange flow in a vertical duct. We also show existence of optimisers for a relaxed version of the above variational problem and derive some symmetry properties of the solutions.

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