SHOCK DIFFRACTION PROBLEM BY CONVEX CORNERED WEDGES FOR ISOTHERMAL GAS

SHOCK DIFFRACTION PROBLEM BY CONVEX CORNERED WEDGES FOR ISOTHERMAL GAS
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等温气体凸角楔块的激波衍射问题

DOI:
10.1007/s10473-021-0407-7
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发表时间:
2021-06
影响因子:
1
通讯作者:
Song Kyungwoo
Song Kyungwoo
中科院分区:
数学3区
文献类型:
--
作者:
Wang Qin;Song Kyungwoo

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本文研究了用非线性波系守恒定律模拟的等温气体的激波衍射构型。我们将激波衍射问题重新表述为一个固定有界区域内的线性退化椭圆方程。简并是Keldysh型的——解的导数在边界处爆炸。建立了解的整体存在性,并证明了解在退化边界附近的C~(0,1/2)-正则性。我们还比较了等温气体和多元气体溶液的差异。
We are concerned with the shock diffraction configuration for isothermal gas modeled by the conservation laws of nonlinear wave system. We reformulate the shock diffraction problem into a linear degenerate elliptic equation in a fixed bounded domain. The degeneracy is of Keldysh type—the derivative of a solution blows up at the boundary. We establish the global existence of solutions and prove the C~(0,1/2)-regularity of solutions near the degenerate boundary. We also compare the difference of solutions between the isothermal gas and the polytropic gas.
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