This paper presents a 2D numerical study of v-shape deflectors subjected to high explosive charge detonation. The literature provides many papers concerning the appropriate geometry of blast protection deflectors. Such structures require a relatively high distance between the ground and the vehicle chassis. In most cases, the placement of a deflector is not possible or it cannot cover the whole area under a chassis. An interesting question that arises is to what extent a set of small deflectors would be able to mitigate blast effects. The content of this paper constitutes an answer to this question. Three analyses were conducted: (1) multiplication of triangle components, (2) effect of deflector size, and (3) geometry-induced shock dynamics. The problem was solved with the use of modelling and simulation methods, in particular, CFD-FEM implemented in the LS-DYNA code. It was considered a plain issue in computational fluid dynamics, where space discretization for each option was built with two-dimensional elements to ensure efficient calculations. Deflectors were described using a rigid wall boundary condition, and an adequate simplified detonation model was assumed. The primary measure of the results was reaction force history, with momentum transfer and pressure distribution maps considered supplementary. The studies performed showed that both minimizing the v-shape deflector size and surrounding it with adjacent structures had a negative impact on its blast mitigation effectiveness. However, for each multi-v-shape deflector, some improvement was present, and, therefore, in situations where the installation of a typical protector is not possible due to dimensional requirements, it may offer a compromise solution.

中文翻译：

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多个V形偏转器的爆炸缓解能力

本文介绍了承受高爆炸装药爆轰的V形偏转器的二维数值研究。文献提供了许多有关防爆板的几何形状的论文。这种结构在地面和车辆底盘之间需要相对较大的距离。在大多数情况下，无法放置导流板，或者无法覆盖机箱下方的整个区域。一个有趣的问题是，一组小型偏转器将在多大程度上减轻爆炸的影响。本文的内容构成了这个问题的答案。进行了三个分析：（1）三角形分量的乘积；（2）偏转器尺寸的影响；（3）几何形状引起的冲击动力学。通过使用建模和仿真方法解决了该问题，特别是，LS-DYNA代码中实现的CFD-FEM。它被认为是计算流体动力学中的一个普通问题，其中每个选项的空间离散化都使用二维元素构建，以确保有效的计算。使用刚性壁边界条件描述了偏转器，并假设了适当的简化爆炸模型。结果的主要度量是反作用力历史记录，动量传递和压力分布图被视为补充。进行的研究表明，最小化v形导流板的尺寸以及将其围绕在相邻结构中都对其减震效果产生负面影响。但是，对于每个多V形偏转器，都存在一些改进，因此，