A simplified approach to modelling blasts in computational fluid dynamics (CFD)

作     者：D.Mohotti K.Wijesooriya S.Weckert D.Mohotti;K.Wijesooriya;S.Weckert

作者机构：School of Engineering and Information TechnologyThe University of New South WalesCanberraACT2600Australia Sensors and Effectors DivisionDefence Science and Technology GroupEdinburghSA5111Australia 

出 版 物：《Defence Technology（防务技术）》 (Defence Technology)

年 卷 期：2023年第23卷第5期

页      面：19-34页

核心收录：

学科分类：080704[工学-流体机械及工程] 08[工学] 080103[工学-流体力学] 0807[工学-动力工程及工程热物理] 0812[工学-计算机科学与技术（可授工学、理学学位）] 0801[工学-力学（可授工学、理学学位）] 

主　　题：Blast loads Computational fluid dynamics Explosions Numerical simulations 

摘      要：This paper presents a time-efficient numerical approach to modelling high explosive(HE)blastwave propagation using Computational Fluid Dynamics(CFD).One of the main issues of using conventional CFD modelling in high explosive simulations is the ability to accurately define the initial blastwave properties that arise from the ignition and consequent *** codes often employ Jones-Wilkins-Lee(JWL)or similar equation of state(EOS)to simulate ***,most available CFD codes are limited in terms of EOS *** are restrictive to the Ideal Gas Law(IGL)for compressible flows,which is generally unsuitable for blast *** this end,this paper presents a numerical approach to simulate blastwave propagation for any generic CFD code using the IGL EOS.A new method known as the Input Cavity Method(ICM)is defined where input conditions of the high explosives are given in the form of pressure,velocity and temperature time-history *** time history curves are input at a certain distance from the centre of the *** is shown that the ICM numerical method can accurately predict over-pressure and impulse time history at measured locations for the incident,reflective and complex multiple reflection scenarios with high numerical accuracy compared to experimental *** ICM is compared to the Pressure Bubble Method(PBM),a common approach to replicating initial conditions for a high explosive in Finite Volume *** is shown that the ICM outperforms the PBM on multiple fronts,such as peak values and overall overpressure curve ***,the paper also presents the importance of choosing an appropriate solver between the Pressure Based Solver(PBS)and Density-Based Solver(DBS)and provides the advantages and disadvantages of either *** general,it is shown that the PBS can resolve and capture the interactions of blastwaves to a higher degree of resolution than the *** is achieved at a much higher computational cos