Publications

This report documents the study that was performed from October 1993 through June 1994 to determine the effects of humidity on the W80 MC3268/3269 Trajectory-Sensing Signal Generators (TSSGs) during the test bed build and laboratory test processes. Mason and Hanger, Silas Mason Co., performs the disassembly and inspections along with the test bed build processes at the Pantex Plant in Amarillo, Texas. The laboratory testing of the TSSGs is performed at Sandia`s Weapons Evaluation Test Laboratory (WETL), located at the Pantex Plant. This report summarizes the historical sequence of events, the engineering analyses and decisions, and the future plans for controlling the ingress of moisture into the TSSGS during laboratory testing.

Solutions from a Parabolized Navier-Stokes (PNS) code with an algebraic turbulence model are compared with wall functions. The wall functions represent the turbulent flow profiles in the viscous sublayer, thus removing many grid points from the solution procedure. The wall functions are intended to replace the computed profiles between the body surface and a match point in the logarithmic region. A supersonic adiabatic flow case was examined first. This adiabatic case indicates close agreement between computed velocity profiles near the wall and the wall function for a limited range of suitable match points in the logarithmic region. In an attempt to improve marching stability, a laminar to turbulent transition routine was implemented at the start of the PNS code. Implementing the wall function with the transitional routine in the PNS code is expected to reduce computational time while maintaining good accuracy in computed skin friction.