Accession Number:

ADA169660

Title:

Imposed-Solution Boundaries for Three-Dimensional Hull.

Descriptive Note:

Final rept. Apr 84-Jan 85,

Corporate Author:

ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD

Personal Author(s):

Report Date:

1986-03-01

Pagination or Media Count:

119.0

Abstract:

This report describes a new imposed-solution transmissive boundary capability that has been made operational in the BRL version of the airblast HULL hydrodynamics code, which can be used for 3-D blast loading computations on rigid structures. Until this time, 3-D blast loading computations have been done by either mapping a 2-D blast wave into the 3-D grid and assigning simple transmissive boundaries, or by imposing a planar constant value non-decaying wave, or by imposing a decaying wave as defined by the LAMB coding. The boundary values for these input waves could only be imposed at two or three of the boundaries. The new imposed-solution boundaries for 3-D Cartesian coordinates allow the time-dependent definition of flow field conditions to be imposed at all six boundary planes. The flow field conditions for these planes may be obtained from a previously-run 2-D cylindrical HULL computation through the use of a new program HULLUP. This new capability permits better definition of free-field flow conditions at boundaries, and thus extends the time that a given grid will produce results on a target that are uncontaminated by artificial waves from improperly defined boundaries. Listings of the changes to HULL, the HULLUP program, and sample runstreams for HULLUP, KEEL, and HULL are included.

Subject Categories:

  • Numerical Mathematics
  • Armor

Distribution Statement:

APPROVED FOR PUBLIC RELEASE