Optimization and verification of mesh size for air shock wave from large distance and near ground explosion

HU Zhile; MA Liangliang; WU Hao; FANG Qin

doi:10.11883/bzycj-2021-0499

Volume 42 Issue 11

Nov. 2022

Turn off MathJax

Article Contents

Article Navigation > Explosion And Shock Waves > 2022 > 42(11): 114201

HU Zhile, MA Liangliang, WU Hao, FANG Qin. Optimization and verification of mesh size for air shock wave from large distance and near ground explosion[J]. Explosion And Shock Waves, 2022, 42(11): 114201. doi: 10.11883/bzycj-2021-0499

Citation:

HU Zhile, MA Liangliang, WU Hao, FANG Qin. Optimization and verification of mesh size for air shock wave from large distance and near ground explosion[J]. Explosion And Shock Waves, 2022, 42(11): 114201. doi: 10.11883/bzycj-2021-0499

Citation:

PDF( 4796 KB)

Optimization and verification of mesh size for air shock wave from large distance and near ground explosion

doi: 10.11883/bzycj-2021-0499

HU Zhile^1
,,
MA Liangliang¹,
WU Hao^{1
,
,},
FANG Qin²

1.
College of Civil Engineering, Tongji University, Shanghai 200092, China
2.
PLA Army Engineering University, Nanjing 210007, Jiangsu, China

Received Date: 2021-12-06
Rev Recd Date: 2022-05-12

Available Online: 2022-05-18

Publish Date: 2022-11-18

Abstract

Abstract

The determination of the blast loading on building structures is a prerequisite for the analyses of dynamic response and damage mode, as well as the blast-resistant design and the structural reinforcement. In determining the blast loadings on building structures with the upgraded computing hardware and software, the low-cost and high-safety numerical simulation methods have increasingly attracted the attention of researchers. In order to improve the computing efficiency and accuracy, and to balance the capacities of both the hardware and the software, by adopting the simplified calculation method, i.e., using symmetry (1D-2D-3D extension) and remapping method, the optimized sets of mesh sizes for the numerical simulation of blast wave propagating for a long distance in large complex block are proposed. Firstly, aiming at the typical near-ground explosion scenarios, e.g., car bombs and ammunition depots, the sensitivity analyses of single-size mesh based on incident wave of air and ground explosions at the scaled distances of 0.2−5.0 m/kg^1/3 and 0.2−39.0 m/kg^1/3 are carried out, respectively. Secondly, considering the limitations of the software and hardware, a set of gradient mesh sizes against the scaled distances is recommended. Furthermore, based on the remapping technique and the suggested gradient mesh sizes, the incident overpressure and impulse of ground explosion are numerically calculated, and an improved method for correcting the peak overpressure with the scaled distances larger than 10.0 m/kg^1/3 is proposed, which is then verified by UFC 3-340-02. Finally, the computing accuracy and efficiency of the proposed optimized mesh sizes are verified by comparing the simulated and experimental overpressures and impulses (71 gauges) in the field explosion test on a full-scaled building. Besides, the applicability of the proposed gradient mesh size in simple reflection field is verified, which provides a reference for the subsequent proportional amplification application of gradient mesh size and the simulation application of blast loadings in more complex reflection environment.
- near ground explosion,
- blast wave propagation,
- mesh size,
- overpressure

FullText(HTML)

References(14)

References

[1]	LUCCIONI B, AMBROSINI D, DANESI R. Blast load assessment using hydrocodes [J]. Engineering Structures, 2006, 28(12): 1736–1744. DOI: 10.1016/j.engstruct.2006.02.016.
[2]	曲树盛, 李忠献. 地铁车站内爆炸波的传播规律与超压荷载 [J]. 工程力学, 2010, 27(9): 240–247. QU S S, LI Z X. Propagation law and overpressure load of blast wave inside subway station [J]. Engineering Mechanics, 2010, 27(9): 240–247.
[3]	金明. 新型护栏型防爆墙数值分析及设计方法研究 [D]. 天津: 天津大学, 2018.15–19. JIN M. Numerical analysis and design method of a new fence type blast wall [D]. Tianjin: Tianjin University, 2018:15–19.
[4]	贾亮景. 城市复杂环境中爆炸波传播的模拟和建筑物的快速损伤评估 [D]. 天津: 天津大学, 2018. JIA L J. Simulation of the propagation of explosion wave in complex urban environment and rapid assess the damagement of buildings [D]. Tianjin: Tianjin University, 2018.
[5]	匡志平, 刘中辉. 地面爆炸二维数值模拟的网格尺寸分析 [J]. 防护工程, 2021, 43(3): 26–30. DOI: 10.3969/j.issn.1674-1854.2021.03.004. KUANG Z, LIU Z. Mesh size analysis for two-dimensional numerical simulation of surface explosion [J]. Protective Engineering, 2021, 43(3): 26–30. DOI: 10.3969/j.issn.1674-1854.2021.03.004.
[6]	CHAPMAN T C, ROSE T A, SMITH P D. Blast wave simulation using AUTODYN2D: a parametric study [J]. International Journal of Impact Engineering, 1995, 16(5/6): 777–787. DOI: 10.1016/0734-743X(95)00012-Y.
[7]	SHI Y C, LI Z X, HAO H. Mesh size effect in numerical simulation of blast wave propagation and interaction with structures [J]. Transactions of Tianjin University, 2008, 14(6): 396–402. DOI: 10.1007/s12209-008-0068-9.
[8]	COWLER M S, QUAN X, FAIRLIE G E. A computational approach to assessing blast damage in urban centers using AUTODYN [C]//Problems Involving Thermal Hydraulics, Liquid Sloshing, and Extreme Loads on Structures. San Diego, California, USA: ASMEDC, 2004: 159–164.
[9]	LÖHNER R, BAUM J D. Calculating blast loads for civil engineering structures [M]. Springer Berlin Heidelberg, 2009. DOI: 10.1007/978-3-540-70805-6_24.
[10]	方秦, 杨石刚, 陈力, 等. 天津港“8·12”特大火灾爆炸事故建筑物和人员损伤破坏情况及其爆炸威力分析 [J]. 土木工程学报, 2017, 50(3): 12–18. FANG Q, YANG S G, CHEN L, et al. Analysis on the building damage, personnel casualties and blast energy of the “8·12” explosion in Tianjin port [J]. China Civil Engineering Journal, 2017, 50(3): 12–18.
[11]	US Department of Defense. Structures to resist the effects of accidental explosions: UFC 3-340-02 [R]. Washington, USA: The US Department of Army, 2008.
[12]	Autodyn theory manual[M]. Pittsburgh, USA: Century Dynamics Inc., 2006.
[13]	US Army Corps of Engineers. Structures to resist the effects of accidental explosions: TM5-1300 [S]. Washington, USA: Department of the Army, 1990.
[14]	XIAO W F, ANDRAE M, STEYERER M, et al. Investigations of blast loads on a two-storeyed building with a gable roof: full-scale experiments and numerical study [J]. Journal of Building Engineering, 2021, 43: 103111. DOI: 10.1016/j.jobe.2021.103111.