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首页> 外文期刊>The Journal of the Acoustical Society of America >Predicting absorption and dispersion in acoustics by direct simulation Monte Carlo: Quantum and classical models for molecular relaxation
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Predicting absorption and dispersion in acoustics by direct simulation Monte Carlo: Quantum and classical models for molecular relaxation

机译：通过直接模拟来预测声学中的吸收和色散蒙特卡洛：分子松弛的量子模型和经典模型

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In the current study, real gas effects in the propagation of sound waves are simulated using the direct simulation Monte Carlo method for a wide range of frequencies. This particle method allows for treatment of acoustic phenomena at high Knudsen numbers, corresponding to low densities and a high ratio of the molecular mean free path to wavelength. Different methods to model the internal degrees of freedom of diatomic molecules and the exchange of translational, rotational and vibrational energies in collisions are employed in the current simulations of a diatomic gas. One of these methods is the fully classical rigid-rotor/harmonic-oscillator model for rotation and vibration. A second method takes into account the discrete quantum energy levels for vibration with the closely spaced rotational levels classically treated. This method gives a more realistic representation of the internal structure of diatomic and polyatomic molecules. Applications of these methods are investigated in diatomic nitrogen gas in order to study the propagation of sound and its attenuation and dispersion along with their dependence on temperature. With the direct simulation method, significant deviations from continuum predictions are also observed for high Knudsen number flows. (c) 2008 Acoustical Society of America.
机译：在当前的研究中，使用直接模拟蒙特卡洛方法对各种频率的声波传播中的实际气体效应进行了模拟。这种粒子方法允许处理高努数下的声学现象，这对应于低密度和分子平均自由程与波长的高比率。在双原子气体的当前模拟中，采用了不同的方法来建模双原子分子的内部自由度以及碰撞中的平移，旋转和振动能量的交换。这些方法之一是用于旋转和振动的完全经典的刚性转子/谐波振荡器模型。第二种方法考虑了振动的离散量子能级，并采用了经典处理的紧密间隔的旋转能级。该方法给出了双原子和多原子分子内部结构的更真实的表示。研究了这些方法在双原子氮气中的应用，以研究声音的传播及其衰减和扩散以及它们对温度的依赖性。使用直接模拟方法，对于高克努森数流，也观察到与连续谱预测的显着偏差。 （c）2008年美国声学学会。

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