Skip to page content
USDA Forest Service

Research & Development Treesearch

Treesearch Home
About Treesearch
Contact Us
Research & Development
Forest Products Lab
International Institute of Tropical Forestry
Pacific Northwest
Pacific Southwest
Rocky Mountain
Southern Research Station
Help - We Participate  Government Made Easy

Global Forest Information Service

US Forest Service
P.O. Box 96090
Washington, D.C.

(202) 205-8333

You are here: Home / Search / Publication Information
Bookmark and Share

Publication Information

View PDF (809 KB)

Title: Simulations of buoyancy-generated horizontal roll vortices over multiple heating lines

Author: Heilman, W.E.;

Date: 1994

Source: Forest Science. 40(4): 601-617.

Publication Series: Scientific Journal (JRNL)

Description: A two-dimensional nonhydrostatic atmospheric model is used to simulate the boundary-layer circulations that develop from multiple lines of extremely high surface temperatures. Numerical simulations are carried out to investigate the role of buoyancy and ambient crossflow effects in generating horizontal roll vortices in the vicinity of adjacent wildland fire perimeters. Numerical results suggest that the downdraft segments of buoyancy-generated horizontal roll vortices can be reinforced when multiple heating lines are present, with the degree of reinforcement dependent on the heating-line spacing. Significant low-level horizontal flow directly over the bounding heating lines is observed in some simulations, suggesting a mechanism for low-level flame migration in actual wildland fires. Multiple heating lines also affect the development and behavior of buoyancy-generated horizontal roll vortices when ambient crossflows are present. Simulations indicate that vortices are more likely to persist for multiple heating lines than for a single heating line when light ambient crossflows are introduced. Although simulation results should be viewed qualitatively, they suggest the potential importance of adjacent fire perimeters in actual wildland fire episodes for the development and behavior of buoyancy-generated horizontal roll vortices.

Keywords: Nonhydrostatic model, vorticity, pressure perturbations, circulation.

Publication Notes:

  • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
  • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
  • This publication may be available in hard copy. Check the Northern Research Station web site to request a printed copy of this publication.
  • Our on-line publications are scanned and captured using Adobe Acrobat. During the capture process some typographical errors may occur. Please contact Sharon Hobrla, if you notice any errors which make this publication unusable.



Heilman, W.E. 1994. Simulations of buoyancy-generated horizontal roll vortices over multiple heating lines. Forest Science. 40(4): 601-617.


 [ Get Acrobat ]  Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility

USDA logo which links to the department's national site. Forest Service logo which links to the agency's national site.