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arXiv 1710.03382math.AP
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关于p-系统的有限时间BV爆破

On finite time BV blow-up for the p-system

Alberto Bressan, Geng Chen, Qingtian Zhang

摘要:

研究了p-系统熵弱解的全变差爆破的可能性,建立了等熵气体动力学模型。假设密度保持一致的正值,而初始数据可以具有任意大的全变差(根据黎曼不变量测量)。证明了两个主要结果。(I)如果全变差在有限时间内爆破,那么解在$t$ - $x$平面上某点的邻域内必然包含无穷多个大激波。(II)可以构造出全变差在有限时间内爆破的分段光滑近似解。对于这些解决方案,从每个相互作用中出现的波的强度是精确的,而稀疏波满足来自真正的非线性假设的自然衰减估计。

英文摘要:

The paper studies the possible blowup of the total variation for entropy weak solutions of the p-system, modeling isentropic gas dynamics. It is assumed that the density remains uniformly positive, while the initial data can have arbitrarily large total variation (measured in terms of Riemann invariants). Two main results are proved. (I) If the total variation blows up in finite time, then the solution must contain an infinite number of large shocks in a neighborhood of some point in the $t$-$x$ plane. (II) Piecewise smooth approximate solutions can be constructed whose total variation blows up in finite time. For these solutions the strength of waves emerging from each interaction is exact, while rarefaction waves satisfy the natural decay estimates stemming from the assumption of genuine nonlinearity.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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