Degenerate Goursat-type boundary value problems arising from the study of two-dimensional isothermal Euler equations
Degenerate Goursat-type boundary value problems arising from the study of two-dimensional isothermal Euler equations
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二维等温欧拉方程研究中产生的简并Goursat型边值问题
DOI:
10.1007/s00033-012-0203-2
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发表时间:
2012-03
影响因子:
2
通讯作者:
Sheng, Wancheng
中科院分区:
文献类型:
--
作者:
Hu, Yanbo;Li, Jiequan;Sheng, Wancheng
As a ladder step to study transonic problems, we investigate two families of degenerate Goursat-type boundary value problems arising from the two-dimensional pseudo-steady isothermal Euler equations. The first family is about the genuinely two-dimensional full expansion of gas into a vacuum with a wedge; the other is a semi-hyperbolic patch that starts on sonic curves and ends at transonic shocks. Both the vacuum and the sonic sets cause parabolic degeneracy that results in substantial difficulties such as singularities of solutions and uniform a priori estimates. Main ingredients in this study are various characteristic decompositions for the pseudo-steady Euler equations in order to obtain necessary a priori estimates. Furthermore, we are able to verify the uniform Hölder continuity of solutions with exponent 1/2 for the gas expansion problem and up to 2/7 for the semi-hyperbolic problem.
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影响因子:
2.4
作者:
Jiequan Li;Tong Zhang;Yuxi Zheng
通讯作者:
Jiequan Li;Tong Zhang;Yuxi Zheng
影响因子:
2.4
作者:
Jiequan Li;Zhicheng Yang;Yuxi Zheng
通讯作者:
Jiequan Li;Zhicheng Yang;Yuxi Zheng
DOI:
10.1137/s0036139900361349
发表时间:
2002
期刊:
SIAM J. Appl. Math.
影响因子:
--
作者:
Jiequan Li
通讯作者:
Jiequan Li
影响因子:
2.4
作者:
Jiequan Li
通讯作者:
Jiequan Li
影响因子:
3
作者:
S. Čanić;B. Keyfitz;Eun Heui Kim
通讯作者:
S. Čanić;B. Keyfitz;Eun Heui Kim