Accession Number:

ADA393201

Title:

Large Eddy Simulation for the Analysis of Weapons Bay Flows

Descriptive Note:

Final rept. May 1999-Jun 2001

Corporate Author:

LOCKHEED MARTIN AERONAUTICS CO FORT WORTH TX

Report Date:

2001-06-29

Pagination or Media Count:

62.0

Abstract:

Computational methods for analysis of weapons bay acoustics and weapons separation were developed. Methods were developed for and implemented in Splitflow a Cartesian based unstructured grid computational fluid dynamics flow solver. Using a Large Eddy Simulation model a variety of flux discretization approaches were investigated. Moving grid and six degree of freedom dynamics capability were implemented in the parallel processing version of Splitflow. Methods for interfacing multiple Splitflow solutions separated by a common boundary surface were developed. A Mach 1.2 flow over a simple cavity flow was simulated. The inflow boundary layer for the cavity flow solution was obtained from a compressible LES channel flow solution. A periodic boundary condition between the inflow and outflow of a compressible channel flow simulation was developed. Computational predictions of sound pressure level spectra were compared to experimental data. A preliminary demonstration of the capability to simulate the release of an AIM 120 from an F-22 fighter jet was performed. Robustness of the simulation methodology was assessed.

Subject Categories:

  • Computer Programming and Software
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE