Browsing by Author "Chester, Alastair"
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Item Open Access Comparative analysis of blast prediction software for far-field shock wave effects behind a blast wall(SAGE, 2024-12-31) Chester, Alastair; Hazael, Rachael; Critchley, RichardThis paper investigates a selection of current and emerging software used in the prediction of overpressure generated through the detonation of a high explosive in the far field behind a blast wall. In particular, this paper compares the software Autodyn, blastFoam, ProSAir, Viper::Blast and WALAIR++. These packages are compared by simulating a 100 kg TNT explosive charge at a stand-off distance of 25 m from a complex structure, then reviewing the performance in terms of the overpressure results, speed of each modelling package, the degree of effect from mesh, and domain sizes and ease of use. A live experimental trial representing the simulation was also performed, although it used a similar but different explosive, for a high-level comparison. The live-trial instrumentation design details are reviewed and compared with best practice. The choice of software is found to lead to variations in peak pressure predictions of 28%, specific impulse by 10% and the simulation speed can vary by a factor of up to 1600 for this type of study. This shows that the choice of blast software package can have a significant impact on the accuracy and attainability of blast predictions.Item Open Access A comparison of far-field explosive loads by a selection of current and emerging blast software(Sage, 2024-04-29) Chester, Alastair; Critchley, Richard; Hazael, RachaelIn blast resistant design, simulation data may be used to generate the explosive loads that would be witnessed by the detonation of a high explosive device. There are many software packages available to simulate explosions, and this study aims to provide a comparison of a selection of them, including some recently available, with the aim of forming an understanding of the potential accuracies and speed of these in far-field explosive prediction. Software selection criteria were formed by a literature survey to highlight the commonly commercially used programmes. Each software package was used to predict the far-field effects of overpressure and specific impulse from two explosive charges against a reflective target. The data generated by these simulations were then critically compared and reviewed, both with respect to each other and, for the 100 kg charge size, with respect to experimental data. It shows that for the simulated scenarios, after domain and cell size fidelity studies have been performed, the choice of software may lead to a variance in prediction in the peak overpressure of up to 50%, specific impulse of up to 15%, and simulation run times by a factor of 600.Item Open Access Data Set for Comparative Analysis of Blast Prediction Software for Far-Field Shock Wave Effects Behind a Blast Wall(Cranfield University, 2024-09-05) Chester, AlastairA comparative analysis of blast prediction software for far-field shock wave effects behind a blast wall. Performed using Autodyn, BlastFoam, ProSAir, Viper::Blast and WALAIR++. The resulting software setup file examples are included here.Item Open Access Far Field Comparison Study Data and Templates(Cranfield University, 2024-04-12 16:09) Chester, AlastairThis file forms the basis for the 3D simulations performed in the study relating to blastFoam.