Finite Time Emergence of A Shock Wave for Scalar Conservation Laws Via Lax-Oleinik Formula
Finite Time Emergence of A Shock Wave for Scalar Conservation Laws Via Lax-Oleinik Formula
复制标题
通过 Lax-Oleinik 公式求解标量守恒定律的冲击波的有限时间出现
DOI:
10.1007/s10473-019-0107-8
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发表时间:
2019-01
影响因子:
1
通讯作者:
Zhang Qi
中科院分区:
文献类型:
--
作者:
Wang Zejun;Zhang Qi
In this paper, we use Lax-Oleinik formula to study the asymptotic behavior for the initial problem of scalar conservation lawut+F(u)x= 0. First, we prove a simple but useful property of Lax-Oleinik formula (Lemma 2.7). In fact, denote the Legendre transform ofF(u) asL(σ), then we can prove that the quantityF(q)−qF′(q)+L(F′(q)) is a constant independent ofq. As a simple application, we first give the solution of Riemann problem without using of Rankine-Hugoniot condition and entropy condition. Then we study the asymptotic behavior of the problem with some special initial data and prove that the solution contains only a single shock fort>T*. Meanwhile, we can give the equation of the shock and an explicit value ofT*.
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DOI:
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