The numerical simulation of shock bifurcation near the end wall of a shock tube

1995 ◽  
Vol 7 (10) ◽  
pp. 2475-2488 ◽  
Author(s):  
Y. S. Weber ◽  
E. S. Oran ◽  
J. P. Boris ◽  
J. D. Anderson
Keyword(s):  
Numerical Simulation ◽  
Shock Tube ◽  
End Wall

The numerical simulation of shock bifurcation near the end wall in a shock tube

1994 ◽  
Author(s):  
Y. Weber ◽  
J. Anderson, Jr. ◽  
E. Oran ◽  
J. Boris
Keyword(s):  
Numerical Simulation ◽  
Shock Tube ◽  
End Wall

Evaluation of blunt body velocity gradient at the shock tube end-wall

2020 ◽  
Vol 170 ◽  
pp. 570-576 ◽  
Author(s):  
Yosheph Yang ◽  
Ikhyun Kim ◽  
Gisu Park
Keyword(s):  
Shock Tube ◽  
Velocity Gradient ◽  
Blunt Body ◽  
Body Velocity ◽  
End Wall

End-Wall Effects on Freely Propagating Flames in a Shock Tube

2022 ◽  
Author(s):  
Adam J. Susa ◽  
Lingzhi Zheng ◽  
Zach D. Nygaard ◽  
Ronald K. Hanson
Keyword(s):  
Shock Tube ◽  
Wall Effects ◽  
End Wall

Numerical simulation of Sharma's shock-tube experiment

1993 ◽  
Author(s):  
STEPHANE MOREAU ◽  
PIERRE-YVES BOURQUIN ◽  
DEAN CHAPMAN ◽  
ROBERT MACCORMACK
Keyword(s):  
Numerical Simulation ◽  
Shock Tube ◽  
Shock Tube Experiment

Shock tube experiments and numerical simulation of the single-mode, three-dimensional Richtmyer–Meshkov instability

2009 ◽  
Vol 21 (11) ◽  
pp. 114104 ◽  
Author(s):  
C. C. Long ◽  
V. V. Krivets ◽  
J. A. Greenough ◽  
J. W. Jacobs
Keyword(s):  
Numerical Simulation ◽  
Shock Tube ◽  
Three Dimensional ◽  
Single Mode

scholarly journals Shock Loading of Closed Cell Aluminum Foams in the Presence of an Air Cavity

2020 ◽  
Vol 10 (12) ◽  
pp. 4128
Author(s):  
Mahesh Thorat ◽  
Shiba Sahu ◽  
Viren Menezes ◽  
Amol Gokhale ◽  
Hamid Hosano
Keyword(s):  
Shock Waves ◽  
Shock Tube ◽  
Shock Loading ◽  
Pressure Rise ◽  
Incident Shock ◽  
Foam Density ◽  
Aluminum Foams ◽  
Closed Cell ◽  
Rigid Walls ◽  
End Wall

It is important to protect assets located within cavities vulnerable to incident shock waves generated by explosions. The aim of the present work is to explore if closed cell aluminum foams can mediate and attenuate incident shocks experienced by cavities. A small cavity of 9 mm diameter and 2 mm length was created within the steel end-wall of a shock tube and exposed to shocks, directly or after isolating by aluminum foam liners. Shock waves with incident pressure of 9–10 bar travelling at a velocity of 1000–1050 m/s were generated in the shock tube. Compared to the no-foam condition, the pressure induced in the cavity was either equal or lower, depending on whether the foam density was low (0.28 g/cc) or high (0.31 to 0.49 g/cc), respectively. Moreover, the rate of pressure rise, which was very high without and with the low density foam barrier, reduced substantially with increasing foam density. Foams deformed plastically under shock loading, with the extent of deformation decreasing with increasing foam density. Some interesting responses such as perforation of cell walls in the front side and densification in the far side of the foam were observed by a combination of scanning electron microscopy and X-ray microscopy. The present work conclusively shows that shocks in cavities within rigid walls can be attenuated by using foam liners of sufficiently high densities, which resist densification and extrusion into the cavities. Even such relatively high-density foams would be much lighter than fully dense materials capable of protecting cavities from shocks.

Numerical Simulation of Shield Tunnel Passing Through Underground Structure

2011 ◽  
Vol 105-107 ◽  
pp. 886-891
Author(s):  
Yong Suo Li ◽  
Ke Neng Zhang ◽  
Mei Long Deng ◽  
Chang Bo Huang
Keyword(s):  
Numerical Simulation ◽  
Underground Structure ◽  
Frame Structure ◽  
Shield Tunnel ◽  
Engineering Practice ◽  
Underground Engineering ◽  
Shield Tunneling ◽  
Tunnel Excavation ◽  
Mine Excavation ◽  
End Wall

Shield tunneling is often adopted in underground engineering such as civil tunnel construction and mine excavation. The program FLAC3D is used to simulate the process of the tunnel excavation through underground structure in Shenyang in this paper. The analysis results show that,(1) the soil below the end wall suffers great displacement, when the shield approaches the end wall of underground framework from different directions, so the soil under the end wall needs to be reinforced. (2) Increasing pressure and volume of grouting can’t significantly reduce the amount of surface subsidence when the drilling of the shield acrosses through the independent foundation. (3) The influences of shielding to the construction are limited because of the constraint function to the surrounding rock above the tunnel by the great entire rigidity of under-ground framework. The results of numerical simulation exactly matches the monitoring data when the stiffness of under-ground frame structure is considered, and it can provide guidance for engineering practice.

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