---
code_id: 12452
site_ownership_code: "OSTI"
open_source: false
landing_contact: "softwarelicensing@llnl.gov"
project_type: "CS"
software_type: "S"
official_use_only: {}
developers:
- email: ""
  orcid: ""
  first_name: "C."
  last_name: "Thorsness"
  middle_name: ""
  affiliations: []
- email: ""
  orcid: ""
  first_name: "J."
  last_name: "Britten"
  middle_name: ""
  affiliations: []
contributors: []
sponsoring_organizations:
- organization_name: "DOE/FE"
  funding_identifiers: []
  primary_award: "AC52-07NA27344"
  DOE: true
contributing_organizations: []
research_organizations:
- organization_name: "Lawrence Livermore National Laboratory (LLNL), Livermore, CA\
    \ (United States)"
  DOE: true
related_identifiers: []
award_dois: []
release_date: "1994-12-01"
software_title: "Underground Coal Gasification Program"
acronym: "CAVSIM"
doi: "https://doi.org/10.11578/dc.20180625.1"
description: "CAVSIM is a three-dimensional, axisymmetric model for resource recovery\
  \ and cavity growth during underground coal gasification (UCG). CAVSIM is capable\
  \ of following the evolution of the cavity from near startup to exhaustion, and\
  \ couples explicitly wall and roof surface growth to material and energy balances\
  \ in the underlying rubble zones. Growth mechanisms are allowed to change smoothly\
  \ as the system evolves from a small, relatively empty cavity low in the coal seam\
  \ to a large, almost completely rubble-filled cavity extending high into the overburden\
  \ rock. The model is applicable to nonswelling coals of arbitrary seam thickness\
  \ and can handle a variety of gas injection flow schedules or compositions. Water\
  \ influx from the coal aquifer is calculated by a gravity drainage-permeation submodel\
  \ which is integrated into the general solution. The cavity is considered to consist\
  \ of up to three distinct rubble zones and a void space at the top. Resistance to\
  \ gas flow injected from a stationary source at the cavity floor is assumed to be\
  \ concentrated in the ash pile, which builds up around the source, and also the\
  \ overburden rubble which accumulates on top of this ash once overburden rock is\
  \ exposed at the cavity top. Char rubble zones at the cavity side and edges are\
  \ assumed to be highly permeable. Flow of injected gas through the ash to char rubble\
  \ piles and the void space is coupled by material and energy balances to cavity\
  \ growth at the rubble/coal, void/coal and void/rock interfaces. One preprocessor\
  \ and two postprocessor programs are included - SPALL calculates one-dimensional\
  \ mean spalling rates of coal or rock surfaces exposed to high temperatures and\
  \ generates CAVSIM input: TAB reads CAVSIM binary output files and generates ASCII\
  \ tables of selected data for display; and PLOT produces dot matrix printer or HP\
  \ printer plots from TAB output."
programming_languages: []
country_of_origin: "United States"
project_keywords: []
licenses: []
recipient_org: "LLNL"
site_accession_number: "2481"
other_special_requirements: "CAVSIM does not work with MS FORTRAN 4.0x. CAVSIM uses\
  \ the LSODE (NESC 592) ordinary differential equation solver, which is included.\
  \ PLOT uses DIGLIB/PC (NESC 9639); this software is not included."
file_name: "2481.zip"
date_record_added: "2018-06-25"
date_record_updated: "2022-12-07"
is_file_certified: true
last_editor: "stooksburys@osti.gov"
comment: "Original package contents note: Media Directory; Software Abstract; UCID-21667;\
  \ Media Includes Source Code, Object Modules; 1CD Rom"
is_limited: false
links:
- rel: "citation"
  href: "https://www.osti.gov/doecode/biblio/12452"