Modifications to MCNP, Version 3B: Incorporating a Variable Density Atmosphere. Addendum

Abstract

MCNP version 3B was modified to incorporate a continuously variable density atmosphere. This was accomplished by representing the variation of air density as a function of altitude with a series of continuous piecewise exponential curves up to a maximum altitude of 1000 km. User-written subroutines and functions were written which incorporated these piecewise functions. These subroutines and functions were subsequently incorporated into a production version of MCNP. Several MCNP subroutines and files were modified in support of these modifications. This report discusses detailed information regarding the theoretical development of the variable density model, the user written subroutines and functions, the modifications to MCNP subroutines and files, and other relevant information.

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1991
Accession Number
ADA231425

Entities

People

  • David L. Monti
  • Kirt A. Mathews

Organizations

  • Air Force Institute of Technology

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Abstracts
  • Accuracy
  • Air Force
  • Altitude
  • Atmospheric Density
  • Computers
  • Data Science
  • Debugging
  • Integrals
  • Mean Free Path
  • Monte Carlo Method
  • Particles
  • Radiation
  • Radiative Transfer
  • Sea Level
  • Simulations
  • War Colleges

Readers

  • Astronomy and Astrophysics.
  • Calculus or Mathematical Analysis
  • Computer Science.