火山喷发的分子动力学模拟
Molecular-Dynamics Simulation of Vulcanian Eruption
摘要：
火山爆发是岩浆-气体混合物的非线性、非平衡突变动力学过程。激波管实验的分子动力学模拟得到了与火山爆发图象相一致的结果，再现了激波和膨胀波。此外，在模拟中还观察到岩浆熔体中气体成分的气泡成核和类调幅分解。结果还与连续介质流体动力学模型进行了比较，本模型再现了连续介质动力学的定性特征。我们发现动力学的粒子描述是研究这类突变动力学的有效方法。
英文摘要：
Vulcanian explosive eruption, which is a nonlinear and nonequilibrium abrupt dynamics of magma-gas mixture, is modeled by a two-component Lennard-Jones particle system. Molecular-dynamics simulation of a shock-tube experiment gives consistent results with a explosive eruption picture of volcanology; Shock wave and expansion wave are reproduced. In addition bubble nucleation of a gas component in the magma melt and spinodal-like decomposition are observed in the simulation. The result is also compared with a continuum hydrodynamic model; Qualitative features of continuum dynamics are reproduced by the present model. We find that the particle description of dynamics is an effective method in such kind of abrupt dynamics.
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