On Blast Pressure Analysis Due to a Partially Confined Explosion: II. Numerical Studies

Feldgun, V.R.; Karinski, Y.S.; Edri, Idan E.; Tsemakh, D.; Yankelevsky, David Z.

doi:10.1260/2041-4196.3.1.61

Cited by 22 publications

(8 citation statements)

References 11 publications

(14 reference statements)

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“…But due to the presence of vent opening, big part of the shock wave energy goes out of the room, an after the second reflection, pressure equalized, but the third pressure spike is observed in the gauge #7. The computed data were compared to experimental data [17] and a satisfactory agreement was obtained. …”

Section: Test Case #4mentioning

confidence: 85%

See 1 more Smart Citation

Simulations of Blast Wave Propagation in Open and Closed Space

Федорова¹,

Valger²,

Zakharova³

2016

Proceedings of the VII European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS Congress 2016)

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Abstract. The paper presents results of 3D numerical simulations of shock wave spreading in cityscape area modeled by prismatic bodies placed on a flat plate and inside a closed room. ANSYS Autodyne software is used for the computations. Four different test cases are investi- INTRODUCTIONNowadays, a lot of industrial accidents accompanied by explosions are happening throughout the world. Also, increase in the number of terrorist acts committed by means of explosions is observed. For improving safety of buildings and structures it is necessary to raise their resistance to explosive effects, as well as to be able to predict degree of potential damage upon explosive loads of various intensities [1 -3]. One of the principal goals in designing the structure resistant to explosive effects is to determine the dynamic response of structures to the impact of the blast wave. To this end, the transient pressure loads on the walls of the civil engineering structures are to be determined.The simulation of explosion is highly complicated, involving an explosion causing the shock wave propagation in air and then interaction with a structure. In recent years, many efforts have been devoted to the development of reliable methods and algorithms for a more realistic analysis of structures subjected to blast loading. Blast predictions are most commonly conducted in one of two ways: simplified analytical and engineering methods [4 -6] or sophisticated CFD models [7 -8].The engineering-level techniques permit one to estimate an explosive shock impact only for isolated buildings. The complexity of the building, the presence of nearby structures and the surrounding environment can't be taken into account. To overcome these limitations, various CFD instrumentations are used for blast impact on the civil engineering objects including in-house and commercial software. Advanced computer aid engineering (CAE) software techniques combined with the latest methods of discrete three-dimensional city modeling permits one to simulate and analyze the effects of explosions in urban areas with a precision which previously was not possible [9, 10].In the previous papers by the authors [11,12], the adaptation of LS-DYNA and AUTODYN software was performed for the 3D problem of the blast wave impact on the single prism installed on the flat plate. Comparison of the simulation results to the experimental data [13] has shown that LS-DYNA and AUTODYN allow one to perform numerical modelling of explosive impact on the environment with an acceptable accuracy. The simplified engineering formulas gave a good coincidence with the experimental data only for the gauges situated on the windward surface of the model.In the paper, ANSYS AUTODYN software was tested on the problems of blast wave propagation in the open and closed spaces. The simulation results are compared to the experimental and numerical data [13 -17]. The ability of two numerical schemes [18][19][20] is studied to predict the pressure history in gauges placed on walls of obstacles.

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Section: Test Case #4mentioning

confidence: 85%

“…As the next stage, computations were performed under the conditions of [17] for the TNT charge, located inside the room of 290×290×270 cm with the vent opening of 120 cm diameter in the ceiling. All the internal corners of the room had a 20 cm chamfer.…”

Section: Test Case #4mentioning

confidence: 99%

Simulations of Blast Wave Propagation in Open and Closed Space

Федорова¹,

Valger²,

Zakharova³

2016

Proceedings of the VII European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS Congress 2016)

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“…The coefficients 0 = 1/10, 1 = 3/5, and 2 = 3/10 are the ideal weights since they generate the central upstream fifth-order scheme for the 5-point stencil 5 . is referred to as the nonlinear weights.…”

Section: Fifth-order Weno Schemesmentioning

confidence: 99%

“…For decades, researchers have been contriving to describe the profile of blast wave numerically. Feldgun et al [4,5] used AUTODYN commercial program implementing the Eulerian multimaterial approach to investigate characteristics of an interior explosion with or without venting. Baum et al [6] developed a coupled computational fluid dynamics (CFD) and computational structural dynamics (CSD) methodology to simulate the blast waves generated by explosives in a test facility with rigid and deformable walls.…”

Section: Introductionmentioning

confidence: 99%

Numerical Method for Predicting the Blast Wave in Partially Confined Chamber

Kong

Cheng

et al. 2018

Mathematical Problems in Engineering

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Blast waves generated by cylindrical TNT explosives in partially confined chamber were studied numerically and experimentally. Based on the classical fifth-order weighted essentially nonoscillatory finite difference schemes (fifth-order WENO schemes), the 1D, 2D, and 3D codes for predicting the evolution of shock waves were developed. A variety of benchmark-test problems, including shock tube problem, interacting blast wave, shock entropy wave interaction, and double Mach reflection, were studied. Experimental tests of explosion events in a partially confined chamber were conducted. Then, the 3D code was employed to predict the overpressure-time histories of certain points of chamber walls. Through comparing, a good agreement between numerical prediction and experimental results was achieved. The studies in this paper provide a reliable means to predict the blast load in confined space.

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“…A full-scale experimental study on confined explosions in a single room with rigid boundaries, with a limited opening for venting at the ceiling, was reported in [11][12][13]. Numerical simulation showed that the measured quasi-static pressure was 27 % lower than that predicted from the Unified Facilities Criteria 3-340-02 [14], which is the standard for enclosure blast resistance used in the United States.…”

Section: Introductionmentioning

confidence: 99%

Analysis of explosion in enclosure based on improved method of images

Guo

Yao

et al. 2016

Shock Waves

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The aim of this paper is to present an improved method to calculate the pressure loading on walls during a confined explosion. When an explosion occurs inside of an enclosure, reflected shock waves produce multiple pressure peaks at a given wall location, especially at the corners. The effects of confined blast loading may bring about more serious damage to the structure due to multiple shock reflection. An approach, first proposed by Chan to describe the track of shock waves based on the mirror reflecting theory, using the method of images (MOI) is proposed to simplify internal explosion loading calculations. An improved method of images is proposed that takes into account wall openings and oblique reflections that cannot be considered with the standard MOI. The approach, validated using experimental data, provides a simplified and quick approach for loading calculation of a confined explosion. The results show that the peak overpressure tends to decline as the measurement point moves away from the center, and increases sharply as it approaches the enclosure corners. The specific impulse increases from the center to the corners. The improved method is capable of predicting pressure-time history and impulse with an accuracy comparable to that of three-dimensional AUTODYN code predictions.

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On Blast Pressure Analysis Due to a Partially Confined Explosion: II. Numerical Studies

Cited by 22 publications

References 11 publications

Simulations of Blast Wave Propagation in Open and Closed Space

Simulations of Blast Wave Propagation in Open and Closed Space

Numerical Method for Predicting the Blast Wave in Partially Confined Chamber

Analysis of explosion in enclosure based on improved method of images

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