本文采用时域方法对三维波物相互作用问题进行了研究和分析。在该方法中,将采用无奇异边界元法(Desingularized Boundary Integral Equation Method,DBIEM)来计算每个时间步长上的流场分布情况,在自由面上满足线性自由面条件,远方辐射...本文采用时域方法对三维波物相互作用问题进行了研究和分析。在该方法中,将采用无奇异边界元法(Desingularized Boundary Integral Equation Method,DBIEM)来计算每个时间步长上的流场分布情况,在自由面上满足线性自由面条件,远方辐射边界上满足水波透射器条件。文中首先详细描述了DBIEM方法的实施过程,其次对其核心控制参数进行了收敛性分析,并将得到的结果与参考文献中的结果进行了比对。结果表明,文中模型可有效模拟水波与简单形状结构物的相互作用问题。展开更多
Ultrasonic speeds have been measured at 298.15 K and 308.15 K for mixtures of formamide ＋ 1 -propanol or 2-propanol. For an equimolar mixture, excess molar compressibility follows the sequence of l-propanol 〉 2-prop...Ultrasonic speeds have been measured at 298.15 K and 308.15 K for mixtures of formamide ＋ 1 -propanol or 2-propanol. For an equimolar mixture, excess molar compressibility follows the sequence of l-propanol 〉 2-propanol. The ultrasonic speed data are correlated by various correlations such as Nomoto＇s relation, van Dael＇s mixing relation and impedance dependence relation, and analyzed in terms of Jacobson＇s free length theory and Schaaffs collision factor theory. Excess isentropic compressibility is calculated from ex- perimental ultrasonic speed data and previously reported excess volume data. The excess molar ultrasonic speed and isentropic compressibility values are fitted to Redlich-Kister polynomial equation. Other proper- ties such as molecular association, available volume, free volume, and intermolecular free length are also calculated. The excess isentropic compressibility data are also interpreted in terms of graph theoretical ap- proach. The calculated isentropic compressibility values are well consistent with the experimental data. It is found that the interaction between formamide and propanol increases when hydroxyl group attached to a carbon atom has more -CH3 groups.展开更多
文摘本文采用时域方法对三维波物相互作用问题进行了研究和分析。在该方法中,将采用无奇异边界元法(Desingularized Boundary Integral Equation Method,DBIEM)来计算每个时间步长上的流场分布情况,在自由面上满足线性自由面条件,远方辐射边界上满足水波透射器条件。文中首先详细描述了DBIEM方法的实施过程,其次对其核心控制参数进行了收敛性分析,并将得到的结果与参考文献中的结果进行了比对。结果表明,文中模型可有效模拟水波与简单形状结构物的相互作用问题。
文摘Ultrasonic speeds have been measured at 298.15 K and 308.15 K for mixtures of formamide ＋ 1 -propanol or 2-propanol. For an equimolar mixture, excess molar compressibility follows the sequence of l-propanol 〉 2-propanol. The ultrasonic speed data are correlated by various correlations such as Nomoto＇s relation, van Dael＇s mixing relation and impedance dependence relation, and analyzed in terms of Jacobson＇s free length theory and Schaaffs collision factor theory. Excess isentropic compressibility is calculated from ex- perimental ultrasonic speed data and previously reported excess volume data. The excess molar ultrasonic speed and isentropic compressibility values are fitted to Redlich-Kister polynomial equation. Other proper- ties such as molecular association, available volume, free volume, and intermolecular free length are also calculated. The excess isentropic compressibility data are also interpreted in terms of graph theoretical ap- proach. The calculated isentropic compressibility values are well consistent with the experimental data. It is found that the interaction between formamide and propanol increases when hydroxyl group attached to a carbon atom has more -CH3 groups.
