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arXiv 1605.04483math.AP
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Chaubergin Euler方程Riemann解的消失压力极限

The Vanishing Pressure Limits of Riemann Solutions to the Chaplygin Euler Equations

Gan Yin, Chun Shen, Lihui Guo

摘要:

考虑了带比例压力的Chaubergin-Euler方程的Riemann解。当压力为零时,有三种情况。包含两个激波的Riemann解收敛于输运方程的Delta激波解。在此过程中,无论是强度和传播速度的三角洲激波进行了详细的研究。我们发现,这与多变气体或等温气体的情况不同。当压力趋于零时,含有两个稀疏波的Riemann解趋于输运方程的两个接触间断解。两个接触间断之间的中间状态是真空状态。当压力为零时,包含一个稀疏波和一个激波的Riemann解趋于输运方程的接触间断解。

英文摘要:

The Riemann solutions to Chaplygin Euler equations with a scaled pressure are considered. When the pressure vanishes, there are three cases. The Riemann solution containing two shock waves converges to the delta shock wave solution of the transport equations. During this process, both the strength and propagation speed of the delta shock are investigated in detail. We find that there is something different from that for polytropic or isothermal gas. The Riemann solution containing two rarefaction waves tends to the two contact discontinuity solution to the transport equations as the pressure goes to zero. The intermediate state between the two contact discontinuities is a vacuum state. The Riemann solution containing one rarefaction wave and one shock wave tends to the contact discontinuity solution to transport equations as the pressure vanishes.

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