Computational Issues in Analysis and Design of Chemical-Laser FLow-Fields
Abstract
The Phase-I COIL effort has focused on extending AeroSoft's GASP and SENSE software for COIL-laser analysis and design. Important improvements include: modifications to the species diffusion model to account for effective diffusion coefficients and pressure-driven diffusion effects, modifications to account for laser power extraction, the addition of a COIL chemistry model, and the development of a strategy for implementing a coupled flow-solver/power-extraction sensitivity analysis method. Results for test problems involving helium and iodine injection showed significant effects from the pressure-diffusion terms. Fully-coupled, power-on laser simulations exhibited an instability resulting from an uncoupling of grid points caused by the bi-linear interpolation method used to transfer data back and forth between the optics mesh and the flow-solver mesh. This problem occurred when there was a large disparity in the number of grid points for the flow-solver and optics mesh in the lasing cavity. Stable power-on results, however, could be obtained for well-matched flow-solver/optics grid systems. Future plans to implement a conservative interpolation scheme should eliminate this problem.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 31, 1999
- Accession Number
- ADA380326
Entities
People
- Eugene Cliff
- W. M. Eppard