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Simulating geometrically complex blast scenarios

Defence Technology（防务技术） 2016年第2期12卷 134-146页

作者： ian g.cullis Nikos NIKIFORAKIS Peter FRANKL Philip BLAKELY Paul BENNETT Paul gREENWOOD QinetiQ Fort Halstead Sevenoaks Kent T N14 7BP UK Cavendish Laboratory Cambridge University Cambridge CB30LH UK Cambridge Numerical Solutions Ltd Ely Cambridge CB7 5NE UK

The effects of blast waves generated by energetic and non-energetic sources are of continuing interest to the ballistics research community.Modern conflicts are increasingly characterised by asymmetric urban warfare, with improvised explosive devices(IEDs) often playing a dominant role on the one hand and an armed forces requirement for minimal collateral effects from their weapons on the other. These problems are characterised by disparate length- and time-scales and may also be governed by complex physics. There is thus an increasing need to be able to rapidly assess and accurately predict the effects of energetic blast in topologically complex scenarios. To this end, this paper presents a new Qineti Q-developed advanced computational package called EAgLE-Blast, which is capable of accurately resolving the generation, propagation and interaction of blast waves around geometrically complex shapes such as vehicles and buildings. After a brief description of the numerical methodology, various blast scenario simulations are described and the results compared with experimental data to demonstrate the validation of the scheme and its ability to describe these complex scenarios accurately and efficiently. The paper concludes with a brief discussion on the use of the code in supporting the development of algorithms for fast running engineering models.

关键词：爆炸装置复杂场景场景模拟能量来源武装部队时间尺度相互作用形状复杂

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The ballistic performance of the bombard Mons Meg

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Defence Technology（防务技术） 2016年第2期12卷 59-68页

作者： ian LEWTAS Rachael MCALISTER Adam WALLIS Clive WOODLEY ian cullis QinetiQ Fort Halstead

The bombard Mons Meg, located in Edinburgh Castle, with a diameter of 19 inches(48 cm), was one of the largest calibre cannons ever built.Constructed in 1449 and presented to King James II of Scotland in 1454, Mons Meg was used in both military and ceremonial roles in Scotland until its barrel burst in 1680. This paper examines the history, internal, external and terminal ballistics of the cannon and its shot. The likely muzzle velocity was estimated by varying the propellant type and the cannon profile was investigated to identify weak spots in the design that may have led to its failure. Using the muzzle velocity calculated from the internal ballistics, simulations were performed with granite and sandstone shot for varying launch angle and ground temperature. The likely trajectory and range of the cannonballs are described. The internal and external ballistics informed the initial conditions of the terminal ballistic impact scenarios. The performance of the cannonball against both period and modern targets, in the form of a pseudo-castle wall and a monolithic concrete target, respectively, were simulated and are presented and discussed.

关键词：弹道性能 Meg 内弹道计算 19英寸速度估计地面温度弹道冲击苏格兰

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维普期刊数据库

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