Modeling the Blast Load Simulator Airblast Environment Using First Principles Codes. Report 2, Blast Load Simulator Environment, Single Structures

Abstract

The Blast Load Simulator (BLS) at the U.S. Army Engineer Research and Development Center (ERDC) has been utilized for applying simulated blast loads on structures for over a decade. An integrated experimental and computational program was undertaken to evaluate first principles codes (FPCs) for modeling airblast environments typical of those encountered in the BLS. The FPCs considered are CTH, DYSMAS, Loci/BLAST, and SHAMRC. The modeling is a multi-year effort and utilizes a number of BLS configurations for the code evaluation. The modeling discussed herein builds upon the first year, which examined the flow environment within an empty BLS and a case involving a single boxlike structure. The current effort expands on the single-structure scenario by employing venting at the target end of the BLS to mitigate upstream reflections and ensure a more ideal loading pulse on the structure. Three structure configurations are considered for this effort. The first is a baseline case with the front face of the box oriented perpendicular to the incoming flow. The remaining two configurations consider a rotated box at 30-and 45-deg obliquity with respect to the incoming flow. Comparisons of modeling results and BLS measurements are discussed. Shortcomings in the modeling physics are identified, and areas for improvement are noted for future development. DISCLAIMER: The contents of this report are not to be used for advertising, publication, or promotional purposes. Citation of trade names does not constitute an official endorsement or approval of the use of such commercial products. All product names and trademarks cited are the property of their respective owners. The findings of this report are not to be construed as an official Department of the Army position unless so designated by other authorized documents.