复杂建筑结构环境下冲击波超压的快速估算方法

为解决复杂建筑结构环境下,冲击波模拟成本与计算精度之间的矛盾,提出利用低成本建模提取超压,再通过修正获得高精度超压的快速估算方法.首先,通过建模分析入射超压的模拟误差,给出精细网格密度下限值λ_lim;然后,进一步大量建模,对超出λ_lim限值的粗网格模拟超压进行修正,并拟合出超压修正系数公式;最后,利用修正系数进行超压估算与验证.研究结果表明:超压模拟误差随着网格密度的增大而减小;利用低成本粗网格建模模拟并加以修正后获得的估算超压值与理论值、试验实测值的误差较小;粗网格模型估算超压值的计算精度与高成本精细网格模型相当.

Rapid Estimation Method of Shock Wave Overpressure in Complex Building Structure Environment

In order to solve the contradiction between cost of shock wave simulation and accuracy of calculation in complex building structure environment, a rapid estimation method of overpressure was proposed, which used low-cost model to extract overpressure, and then obtained high-precision overpressure by correction. Firstly, the simulation error of incident overpressure was analyzed by modeling, and the lower limit of mesh density λ_lim was given. Then a large number of models were built to revise the overpressure simulated by the coarse mesh, and the overpressure correction coefficient formula was fitted. Finally, the overpressure was estimated and verified by the correction coefficient. The results show that the errors decrease with the increases of mesh density. The results show that the errors decrease with the increases of mesh density. There are small errors between the calculated overpressure value and the theoretical value or the measured value. The precision of overpressure value estimated by coarse mesh model is equal to that of high cost fine mesh model.