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Jul 11, 2017

Source Term Wizard Improvements

  • Updated numerous Source Term Wizard calculation methods to generate time-varied emission rates for the following algorithms. Using more modern and accurate methods will improve the accuracy and realism of modeling for cases such as pressurized vessels where a release rate will drop as pressure bleeds off.
    • Gas Release
    • Liquid Flow Rate
    • Pool Evaporation
    • Two-phase Release
  • Added the capability to model a leak through a pipe connected to a tank in the Source Term Wizard, giving users the ability to explicitly model a wider range of scenarios
  • Added an option to delete a previously saved source from the Source Term Wizard

    Delete Previous Save Source - BREEZE INCIDENT ANALYST

System Enhancements

  • Added a new Chart Tab that allows users to view the time series Source Term Wizard results and dispersion concentration results in a table or chart format. This provides a useful new way to graphically display model results and will also help users to better understand the behavior of each release case.


  • Enhanced the Chemical Database by adding new chemical properties in the Pool Evaporation Tab including molecular diffusivity and constants to calculate liquid and gas kinematic viscosity. The new properties allow Incident Analyst to use an improved array of pool evaporation models, with more powerful source term calculations and the ability to simulate time-varying evaporation rates. By providing more options on how evaporation parameters are defined, it will be easier for users to find the information needed when adding a new chemical to the chemical database.

    New Properties in Pool Evaporation Tab - BREEZE INCIDENT ANALYST

  • Enhanced the SLAB model to allow the user to specify the time step used for calculating and displaying at discrete receptors. This allows the user to decide how much detail they want when viewing the evolution of a plume over time.

    Specify time step in SLAB - BREEZE INCIDENT ANALYST

  • Added a graph to display the release concentration at user-specified time intervals for discrete receptors in the Chart Tab, allowing the user to view the impacts over time of a release on a specific point of interest

    Added Graph to display release concentration - BREEZE INCIDENT ANALYST

  • Updated the default “height of interest” in the Output Options from 0.5 m to 1.5 m
  • Improved the database conversion tool that imports the SQLite database file, allowing automated import of all types of chemical database files from older versions of Incident Analyst
  • Updated the Richardson Number calculation method to incorporate more commonly used equations

Bug Fixes

  • Fixed a bug that produced incorrect overpressure values for gridded receptors in the TNT model
  • Fixed a bug that incorrectly recorded the percentage of the components in a newly added mixture to be a few decimal places more than what the user entered in the Chemical Database Tab
  • Fixed a bug that could cause incorrect receptor concentration output for some Degadis model runs
  • Fixed a bug that entered an incorrect height of interest value into the INPUFF input file when only discrete receptors were specified

Known Issues

  • The INPUFF model requires multiple meteorological data to be manually entered individually
  • For a pool fire, the equation to calculate maximum surface emissive power, has to be manually entered in the Chemical Database
  • The current jet fire model in BREEZE Incident Analyst is only explicitly for gaseous releases


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