Affiliations: Department of Vehicle Engineering, National Pingtung
University of Science and Technology, Pingtung, 91201 Taiwan. E-mail:
chtai@mail.npust.edu.tw | Department of Mechanical Engineering, Chung Yuan
Christian University, Chung-Li, 32023, Taiwan. E-mail:
jyhtong@cycu.edu.tw | Corresponding Author, Department of Vehicle
Engineering, National Pingtung University of Science and Technology, Pingtung,
91201 Taiwan. E-mail: swlo@mail.npust.edu.tw | Department of Mechanical Engineering, Chung Yuan
Christian University, Chung-Li, 32023, Taiwan. E-mail:
hsenchn.chou@msa.hinet.net
Abstract: In this study, the complex phenomena of propagation and interaction
of the blast waves impacting on obstacles were visualized and investigated
using a numerical method. Three different distances between an immovable wall
and a bomb shelter with a square block inside were considered while a blast
source is located in front of wall at the same distance from shelter. The
transitional shock phenomena were simulated by means of a multi-block mesh
system and a flux computational model. Spatial discretization was performed
using the Roe's upwind schemes; time integration was achieved via
the second-order explicit Hancock method. Proof of the numerical results
indicated that those results were in close agreement with the experimental data
obtained for the wedge flow. For the cases proved, the geometries of the
reflected wave patterns followed by the incident blast waves crossing the
immovable wall and impacting inside of bomb shelters were similar. However the
height of wall has a dominating impact on the effect associated with different
incident blast waves from the same blast source. Meanwhile, different reflected
overpressure-time histories and streamlines were observed and analyzed for the
results obtained.
