Non Ideal Airblast Effects from Urban and Natural Terrain

Joe Crepeau, Charles Needham, ARA



Abstract:
Non-ideal airblast is produced from detonations over urban and natural
terrain. Mechanical effects of a blast wave reflecting off non-ideal
surfaces produces shielding and channeling effects that may be
considerably different than those from a detonation over an ideal
surface. Work in the area non-ideal airblast generated from urban and
natural terrain is presented.



Divine Strake is a high-explosive (HE) test sponsored by the Defense
Threat Reduction Agency (DTRA) and is scheduled for the summer of 2006
at the Nevada Test Site (NTS). The test is a detonation of a 700 ton
buried heavy AN/FO charge above a tunnel structure. The main purpose
of the test is to study ground shock effects on deeply buried tunnel
structures. Of secondary interest is the airblast produced by a
buried charge and its modification as it propagates over the local
terrain.



Sandia National Laboratory (SNL) recently sponsored a number of
computational fluid dynamics (CFD) airblast calculations of the
upcoming event. SNL contracted Applied Research Associates, Inc.
(ARA) to perform two- and three-dimensional (2D and 3D) predictive
airblast calculations for the test. The CFD calculations were run
with SHAMRC and characterize the airblast environments induced by the
non-ideal charge configuration and the surrounding terrain. They
include 2D calculations with and without terrain and with a responding
and non-responding ground model. A single 3D calculation with a
non-responding ground model was also completed. Results of the
calculations provide test planners with environments that can be
expected at instrumentation and test structure locationS. A single, 3D
calculation with a realistic ground model is planned once the charge
and detonation site details are finalized.



ARA has also completed several SHAMRC calculations investigating
non-ideal airblast over urban and natural terrain under a contract
with DTRA for the Near Surface Weapons Effects Tools – 3D (NSWET-3D),
Airblast/Thermal task. One set of calculations modeled a nuclear
detonation in New York City. The buildings were generated
automatically from ArcView shapefiles, placed on a flat ground
surface, and modeled as non-responding. One of these calculations was
run under the Capability Applications Project (CAP) sponsored by the
Department of Defense (DoD) High Performance Computing Modernization
Program (HPCMP). Another set of calculations modeled the Smoky
nuclear event at NTS. The calculations included models of natural
terrain, thermal heating of the terrain surface, and dust sweep-up
from the surface.

Link ??


David wrote:
Non Ideal Airblast Effects from Urban and Natural Terrain

Joe Crepeau, Charles Needham, ARA



Abstract:
Non-ideal airblast is produced from detonations over urban and natural
terrain. Mechanical effects of a blast wave reflecting off non-ideal
surfaces produces shielding and channeling effects that may be
considerably different than those from a detonation over an ideal
surface. Work in the area non-ideal airblast generated from urban and
natural terrain is presented.



Divine Strake is a high-explosive (HE) test sponsored by the Defense
Threat Reduction Agency (DTRA) and is scheduled for the summer of 2006
at the Nevada Test Site (NTS). The test is a detonation of a 700 ton
buried heavy AN/FO charge above a tunnel structure. The main purpose
of the test is to study ground shock effects on deeply buried tunnel
structures. Of secondary interest is the airblast produced by a
buried charge and its modification as it propagates over the local
terrain.



Sandia National Laboratory (SNL) recently sponsored a number of
computational fluid dynamics (CFD) airblast calculations of the
upcoming event. SNL contracted Applied Research Associates, Inc.
(ARA) to perform two- and three-dimensional (2D and 3D) predictive
airblast calculations for the test. The CFD calculations were run
with SHAMRC and characterize the airblast environments induced by the
non-ideal charge configuration and the surrounding terrain. They
include 2D calculations with and without terrain and with a responding
and non-responding ground model. A single 3D calculation with a
non-responding ground model was also completed. Results of the
calculations provide test planners with environments that can be
expected at instrumentation and test structure locationS. A single, 3D
calculation with a realistic ground model is planned once the charge
and detonation site details are finalized.



ARA has also completed several SHAMRC calculations investigating
non-ideal airblast over urban and natural terrain under a contract
with DTRA for the Near Surface Weapons Effects Tools - 3D (NSWET-3D),
Airblast/Thermal task. One set of calculations modeled a nuclear
detonation in New York City. The buildings were generated
automatically from ArcView shapefiles, placed on a flat ground
surface, and modeled as non-responding. One of these calculations was
run under the Capability Applications Project (CAP) sponsored by the
Department of Defense (DoD) High Performance Computing Modernization
Program (HPCMP). Another set of calculations modeled the Smoky
nuclear event at NTS. The calculations included models of natural
terrain, thermal heating of the terrain surface, and dust sweep-up
from the surface.

anfo is fertilizer and heating oil?

On 1 Apr 2006 14:17:49 -0800, "N9NEO" wrote:

anfo is fertilizer and heating oil?

more or less. the type of oil can vary. From the little I know the
user can get differrent blast characteristics by changing they type of
petroleum product.

On 1 Apr 2006 14:11:11 -0800, wrote:



Link ??


David wrote:
Non Ideal Airblast Effects from Urban and Natural Terrain



http://www.saviac.org/76th_Symposium/Abstracts/L-33.htm

On Sun, 02 Apr 2006 00:36:47 GMT, nothermark
wrote:

On 1 Apr 2006 14:17:49 -0800, "N9NEO" wrote:

anfo is fertilizer and heating oil?

more or less. the type of oil can vary. From the little I know the
user can get differrent blast characteristics by changing they type of
petroleum product.
http://www.totse.com/en/bad_ideas/ka...om/162715.html

http://www.saviac.org/76th_Symposium/Abstracts/L-33.htm
wrote:
Link ??


David wrote:
Non Ideal Airblast Effects from Urban and Natural Terrain

Joe Crepeau, Charles Needham, ARA



Abstract:
Non-ideal airblast is produced from detonations over urban and natural
terrain. Mechanical effects of a blast wave reflecting off non-ideal
surfaces produces shielding and channeling effects that may be
considerably different than those from a detonation over an ideal
surface. Work in the area non-ideal airblast generated from urban and
natural terrain is presented.



Divine Strake is a high-explosive (HE) test sponsored by the Defense
Threat Reduction Agency (DTRA) and is scheduled for the summer of 2006
at the Nevada Test Site (NTS). The test is a detonation of a 700 ton
buried heavy AN/FO charge above a tunnel structure. The main purpose
of the test is to study ground shock effects on deeply buried tunnel
structures. Of secondary interest is the airblast produced by a
buried charge and its modification as it propagates over the local
terrain.



Sandia National Laboratory (SNL) recently sponsored a number of
computational fluid dynamics (CFD) airblast calculations of the
upcoming event. SNL contracted Applied Research Associates, Inc.
(ARA) to perform two- and three-dimensional (2D and 3D) predictive
airblast calculations for the test. The CFD calculations were run
with SHAMRC and characterize the airblast environments induced by the
non-ideal charge configuration and the surrounding terrain. They
include 2D calculations with and without terrain and with a responding
and non-responding ground model. A single 3D calculation with a
non-responding ground model was also completed. Results of the
calculations provide test planners with environments that can be
expected at instrumentation and test structure locationS. A single, 3D
calculation with a realistic ground model is planned once the charge
and detonation site details are finalized.



ARA has also completed several SHAMRC calculations investigating
non-ideal airblast over urban and natural terrain under a contract
with DTRA for the Near Surface Weapons Effects Tools - 3D (NSWET-3D),
Airblast/Thermal task. One set of calculations modeled a nuclear
detonation in New York City. The buildings were generated
automatically from ArcView shapefiles, placed on a flat ground
surface, and modeled as non-responding. One of these calculations was
run under the Capability Applications Project (CAP) sponsored by the
Department of Defense (DoD) High Performance Computing Modernization
Program (HPCMP). Another set of calculations modeled the Smoky
nuclear event at NTS. The calculations included models of natural
terrain, thermal heating of the terrain surface, and dust sweep-up
from the surface.