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arXiv 2008.06715math.APmath-phmath.FAmath.MP
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Prandtl方程解的正则性

Regularity of the solution of the Prandtl equation

V. E. Petrov, T. A. Suslina

摘要:

研究了Prandtl方程$$ {u(x)\over p(x)}- {1\over 2π}\int_{-1}^1 {u'(t) \over t-x} \,dt = f(x) $$ Dirichlet问题解的可解性和正则性.假设$p(x)$是$(-1,1)$上的正函数,使得$\sup \frac{(1-x^2)}{ p(x)} < \infty$。利用区间$(-1,1)$上的特殊积分变换,引入了空间$\widetilde{H}^s(-1,1)$的标度.在类$\widetilde{H}^{s}(-1,1)$与类$0\le s \le 1$中得到解的存在唯一性定理.具体地,对于$s=1$,结果如下:如果是$r^{1/2} f \in L_2$,则是$r^{-1/2} u, r^{1/2} u' \in L_2$,其中$r(x)=1-x^2$。

英文摘要:

Solvability and regularity of the solution of the Dirichlet problem for the Prandtl equation $$ {u(x)\over p(x)}- {1\over 2π}\int_{-1}^1 {u'(t) \over t-x} \,dt = f(x) $$ is studied. It is assumed that $p(x)$ is a positive function on $(-1,1)$ such that $\sup \frac{(1-x^2)}{ p(x)} < \infty$. We introduce the scale of spaces $\widetilde{H}^s(-1,1)$ in terms of the special integral transformation on the interval $(-1,1)$. We obtain theorem about existence and uniqueness of the solution in the classes $\widetilde{H}^{s}(-1,1)$ with $0\le s \le 1$. In particular, for $s=1$ the result is as follows: if $r^{1/2} f \in L_2$, then $r^{-1/2} u, r^{1/2} u' \in L_2$, where $r(x)=1-x^2$.

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