HGSYSTEM News Page

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This page (last updated 23/11/1998)  lists in summary the changes made to the HGSYSTEM programs since the last release.  We will refer to these changes collectively as HGSYSTEM 3.1 but, because HGSYSTEM is a suite of programs, V3.1 is an evolving creature.  Therefore,   Version 3.1 should  be regarded as indicating that the programs within may be different from the 'official' releases.  The official releases  are 1.0 (also known as Nov' 90) and 3.0.  We term them 'official' releases because they have been independently reviewed and thus have a particular regulatory status.  The last review we know of was conducted for the US DoE on version 3.0.

This page contains:

 

HGSYSTEM model status and links

Model

HGSYSTEM 3.0
Model Version

Current Model Version

Comments
AEROPLUM

 

2.1

2.14
  • Numerical stability improved. Trap contracting plume on flash..
  • Output format statements changed to allow larger values.
  • Screen output routed through display routine (for future GUI).
  • Minor changes for compiler (WATCOM 10.5)
  • Source code split into more manageable sections
DATAPROP

 

2.6

2.7
  • Data properties moved to external file. Compounds can be added by appending to this file.
  • Needs new batch file to work.
DDMAIN

2.3

2.3
  • No change
FFMAIN

2.3

2.3
  • No change
GET2COL    
  • No change
HEGABOX

 

3.01

3.01
  • Screen output routed through display routine (for future GUI).
HEGADASS

 

3.2

3.24
  • Screen output routed through display routine (for future GUI).
  • Error in treatment of buoyant releases from breakpoint or from source that gave too large dispersion distances fixed.
HEGADAST

 

3.2

3.24
  • Screen output routed through display routine (for future GUI).
  • Error in treatment of buoyant releases from breakpoint or from source that gave too large dispersion distances fixed.
  • Minor changes for compiler - fixes 'internal file full' message
HEGLOW

 

-

0.0 Beta
  • Development version of low wind speed model based on HEGABOX.
HFFLASH

 

2.2

2.2
  • No change
HFPLUME

 

3.5

3.501
  • Major rearrangements of source code to facilitate model improvements.
HFSPILL

 

2.3

2.3
  • No change
HGINTER

 

  

-
  • Dropped pending replacement. Does not run under NT
LPOOL

 

1.1

 
  • Fixed error when user supplied spill rates with more than one entry- v3.0 sometimes released 'extra' liquid.
  • Reduced frequency of code looping with 'hosed man hosed' error.
  • Changed error tolerances to match to avoid Balcheck errors.
  • Minor changes to suit compiler.
  • Adjustment to avoid very large aerosol fractions being produced for small superheat. Assume aerosol fraction pro-rata with superheat. 100% aerosol for superheat greater than 10 C.
  • Vapour cloud composition for matching with HEGADAS-T now is average composition over MAXTIM. Previously was pool composition.
PGPLUME

 

2.0

2.14
  • Screen output routed through display routine (for future GUI).
  • Changed effect of averaging time for short (<600 s) times. Now assumes that both y and z vary as t0.1 at times shorter than 600 s. This correctly gives concentration scaling as t0.2.
  • Rounding errors on input producing sum of mass fractions greater than 1 fixed. Associated with link files containing values in mixed fixed and exponential format.
POSTHS

 

2.01

2.01
  • unchanged
POSTHT

 

2.01

2.01
  • unchanged
PROFILE

 

2.01

2.07
  • Changed effect of averaging time for short (<600 s) times. Now assumes that both sigmay and sigma z vary as t 0.1 at times shorter than 600 s. This correctly gives concentration scaling as t 0.2.
  • Tentatively extended model to cater for grounded plumes
  • Will not parse Aeroplume results files with very long titles
  • Output in ppm and not percent volume.
PROFILEHF

 

-

3.00
  • Copy of PROFILE adapted for HFPLUME.
SPILL

 

1.1

1.1
  • unchanged

New Batch files: 

The original HGSYSTEM batch files were written for limited processors. To save space the HGSYSTEM programs were stored as compressed (PKZIP) files, decompressed at runtime and the decompressed file removed when the run was completed.  This procedure was carried out by RUNEXE.BAT. Furthermore checks were carried out to see if system resources (memory, diskspace) were sufficient for purpose.  These checks are no longer necessary Accordingly a modified set of batch files is provided that do away with the compression/decompression etc. 

The new batch files DO NOT ASSUME HGSYSTEM is in C:\HGSYSTEM but instead use an environment variable called HGSYSTEM to identify the HGSYSTEM directory. 

To set the environment variable:

Make the entry in the appropriate box by following start - settings - control panel - system - environment.

alternatively to avoid making any permanent change to system settings, and for the sake of argument assuming that the destination is still C:\HGSYSTEM,   create a batch file that contains the lines. Then run this batch file from a command prompt before using HGSYSTEM

SET HGSYSTEM=C:\HGSYSTEM
PATH  %PATH%;%HGSYSTEM%

Note:

(1) That this will only affect the settings while the command window is open. 

(2) The quotation marks are necessary in the case that the PATH environment variable contains the names of directories which have spaces in the them.  

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Standard Template File Library

HGSYSTEM works by preparing input files - running a model - running a second model etc. and examples of the input files (for the first mode in the sequence) and partial data files (for subsequent models in the sequence) are given in the STINPUT subdirectory.   For example to carry out a pool evaporation run called gas.

copy c:\hgsystem\stinput\standno.dpi gas.dpi # get template file
<your editor> gas.dpi # make changes to parameters that are needed for the run
dataprop  gas # run dataprop, creates gas.lpl
copy 'c:\hgsystem\stinput\stdp.lpp'  gas.lpp # get partial input data for lpool
<your editor> gas.lpp # setup lpool data
lpool gas.lpp gas.lpl   gas # runs lpool, concatenating the 2 files and creating gas.lpi and results files
copy 'c:\hgsystem\stinput\stlpool.htp'  gas.htp # get partial input data for hegadast
<your editor> gas.htp # make the necessary changes to the partial data
hegadast gas.htl  gas.htp   gas # carry out the HEGADAS-T run

The hardest part of this, rather tedious but easily automated, process is remembering which tempate file is which. To try to make this process simpler the standard input files have been renamed with long filenames.  Decompress this zip file into the STINPUT  folder to get the long filenames but remember that you MUST use old DOS filenames (8.3 characters) with the HGSYSTEM programs..  See the hint below for drag and dropping files onto the command window (MSDOS prompt) for easy file copying.

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