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Numerical Blast Wave Identification and Tracking Using Solution-Based Mesh Adaptation Approach

机译:基于解决方案的网格适应方法的数值爆炸波识别与跟踪

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Accurate and efficient numerical prediction of stationary and traveling shock waves via Computational Fluid Dynamics (CFD) can be achieved with the application of solution based mesh adaptation (refinement and coarsening). It has been thus far very difficult to efficiently predict moving shock waves of different strengths within the same fluid in a computational domain. Proposed numerical method is based on a shock-detecting approach that uses values of the Mach number normal to a shock as a shock-identification parameter to track both stationary and moving shock waves of different strengths. This paper discusses the implementation of a version of this approach, coupled with the application of a new filtering technique, to filter out cells spuriously marked for refinement. The new approach is tested in 2D and 3D shock tube test problems, and then applied to a 3D problem of tracking of a weak portion of a blast wave from a tank gun propagating toward the crew. The prediction of propagation of both strong and weak shock waves originating from the firing of a ballistic weapon using CFD can be a valuable tool in the evaluation of artillery system, tank and fighting vehicle designs. Transient numerical simulations are carried out using the general purpose CFD code FLUENT, version 6.3. Numerical values of hull surface pressures are compared with experimental data, and favorable agreement is found.
机译:通过应用基于溶液的网格适配(细化和粗化),可以通过计算流体动力学(CFD)来实现通过计算流体动力学(CFD)的准确和高效的数值预测。因此,已经非常难以有效地预测在计算领域的相同流体内不同强度的移动冲击波。提出的数值方法基于冲击检测方法,其使用正常的马赫数的值作为冲击作为冲击识别参数,以跟踪不同强度的静止和移动冲击波。本文讨论了这种方法的一个版本的实现,加上了一种新的过滤技术的应用,滤除施用的细胞,显着标记为细化。在2D和3D冲击管测试问题中测试了新方法,然后应用于跟踪从朝向船员传播的坦克枪的隆波弱部分跟踪的3D问题。使用CFD射击弹道武器射击的强度和弱冲击波传播的预测可以是炮兵系统,罐和战斗车辆设计的评估中的有价值的工具。使用通用CFD代码流畅,第6.3版进行瞬态数值模拟。将船体表面压力的数值与实验数据进行比较,发现有利的协议。

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