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Man Pages


Manual Reference Pages  -  ALL_SF (n)

.ds Aq ’

NAME

all_sf - obtain shape factors between named regions of an entire mged database

CONTENTS

SYNOPSIS

all_sf model.g objects...

DESCRIPTIONS

all_sf is an interactive program used to create a file containing shape factors between all regions of the named objects. The shape factor from region i to region j is the fraction of total energy radiated from region i that is intercepted by region j. This program finds the shapefactors for all regions in an mged model not just shapefactors between engine regions.

All_sf uses a Monte Carlo simulation, so increasing the number of significant digits in the answer by one requires about a 100-fold increase in the number of rays fired.

Three different files are created by all_sf: an output file, a longwave radiation exchange file, and an error file. The output file lists the shapefactors between each region. The longwave radiation exchange file is for use with PRISM. This file is not quite PRISM ready so the user must fill in the missing parameters if it is to be used with PRISM. The error file is basically used for checking errors in the program and probably will not be used by the average user.

EXAMPLE

The following is an example from an interactive session.

        $ all_sf con.sph.g all.air
        Enter name of output file (25 char max).
                cs.out
        Enter name of longwave radiation exchange file (25 char max).
                cs.lwx
        Enter the name of the error file (25 char max).
                cs.err
        Database Title:  concentric spheres for use with
        Number of regions:  3
        Min & max for entire model.
                X:  -2300.000000 - 2300.000000
                Y:  -2300.000000 - 2300.000000
                Z:  -2300.000000 - 2300.000000
        Center:  0.000000, 0.000000, 0.000000

        Radius: 3984.216857         Surface Area: 199478365.653926

        Enter the number of rays to be fired.                 50000000         Region names in structure.         Do you wish to enter your own seed (0) or use the default of 1 (1)?                 1         Seed initialized         $

SEE ALSO

firpass(1), secpass(1), showtherm(1), ir-X(1), ir-sgi(1), pictx(1), pictsgi(1), shapefact(1), Users Manual for IRPREP (BRL-SP-96), Computer Programs for Generating an Input File for PRISM and Displaying PRISM Results (BRL report in progress)

AUTHOR

Susan A. Coates

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BRL-CAD ALL_SF (nged) 04/04/2016

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