Prediction and simulation of compressive shocks with lower perturbed density for increasing shock strength in real gases.
Prediction and simulation of compressive shocks with lower perturbed density for increasing shock strength in real gases.
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DOI：
10.1103/physreve.82.036324
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发表时间：
2010-09
期刊：
影响因子：
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通讯作者：
S. Taniguchi;A. Mentrelli;T. Ruggeri;M. Sugiyama;N. Zhao
中科院分区：
文献类型：
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作者：
S. Taniguchi;A. Mentrelli;T. Ruggeri;M. Sugiyama;N. Zhao
本文用van der Waals本构方程对实际气体中一种特殊类型的压缩激波进行了预测和模拟。这种冲击波产生从气体到液体的相变，在某些特殊情况下，又回到气相。这种激波具有一个非常不寻常的性质，即当扰动压力(激波后的压力)增加时，扰动密度减小，并从上方趋于极限值，这与通常众所周知的压缩激波的密度从下方趋于极限值形成对比。为了获得这样的压缩上激波，需要在ρp平面上气液共存曲线附近一个密度和压力值都很低的很薄的区域内选择无扰动状态(激波前的状态)。这个取决于组成分子内部自由度的区域是完全确定的。
In this paper we predict and simulate a peculiar type of compressive shock in a real gas modeled by the van der Waals constitutive equation. This shock produces a phase transition from the gas to the liquid phase and, under some special circumstances, back to the gas phase. This shock has a quite unusual property that when the perturbed pressure (the pressure after a shock) increases, the perturbed density decreases and tends to a limit value from above, in contrast with the ordinary well-known compressive shock in which the density tends to the limit value from below. To achieve such a compressive upper shock, it is necessary to choose the unperturbed state (the state before the shock) in a very thin region in the ρp plane, characterized by low values of density and pressure, near the gas-liquid coexistence curve. This region, which depends on the internal degrees of freedom of a constituent molecule, is completely identified.