Study of blast wave overpressures using the computational fluid dynamics

Abstract

Study of blast wave overpressures using the computational fluid dynamicsEstudo das sobrepressões da onda de choque de uma explosão utilizando a fluidodinâmica computacional Abstract ResumoThe threats of bomb attacks by criminal organizations and accidental events involving chemical explosives are a danger to the people and buildings. Due the severity of these issues and the need of data required for a safety design, more research is required about explosions and shock waves. This paper presents an assessment of blast wave overpressures using computational fluid dynamics software. Analyses of phenomena as reflection of shock waves and channeling effects are done and a comparison between numerical results and analytical predictions has been executed, based on the simulation of several models. The results of this paper suggest that the common analytical predictions aren't accurate enough for an overpressure analysis in small stand-off distances and that poorly designed buildings may increase the shock wave overpressures due multiple blast wave reflections, increasing the destructive potential of the explosions.

Simulasi Penyebaran Gas Biohidrogen Di Dalam Loji Biogas Menggunakan Perkomputeran Dinamik Bendalir Dan Penilaian Kesan Kebakaran Dan Letupan

“…WTNT dapat dikira menggunakan Persamaan (4), yang mana Wgas (kg) ialah jisim gas mudah terbakar (H2) yang mengambil tempat dalam letupan, ΔHC ialah haba pembakaran gas mudah terbakar (H2) (kJ kg -1 ), dan ETNT ialah tenaga letupan TNT (kJ kg -1 ), manakala η ialah pecahan tenaga yang dilepaskan sebagai gelombang bagas [19]. Persamaan (5) digunakan untuk menentukan tekanan lampau, ΔP (kPa) oleh gelombang bagas disebabkan letupan [24].…”

Numerical analysis of the explosion of gas tanks using computational fluid dynamics

“…In addition to these studies, using computational fluid dynamics, Cen et al [17] and Pang et al [18] performed gas tank explosion simulations in an apartment and in a kitchen, respectively. Numerical research about explosion overpressures in urban and residential environments and the use of obstacles to mitigate shock wave effects was carried out by Costa and Doz [19] and Vyazmina et al [20].…”