Programs in Physics & Physical Chemistry
|[Licence| Download | New Version Template] aafo_v1_0.gz(3 Kbytes)|
|Manuscript Title: DECOMP: computational package for nitrogen transport modelling in tissues.|
|Authors: B.R. Wienke|
|Program title: DECOMP|
|Catalogue identifier: AAFO_v1_0|
Distribution format: gz
|Journal reference: Comput. Phys. Commun. 40(1986)327|
|Programming language: Fortran.|
|Computer: CRAY 1S.|
|Operating system: CTSS.|
|RAM: 400K words|
|Word size: 64|
|Peripherals: graph plotter.|
|Keywords: Fluid dynamics, Nitrogen transport, Decompression criteria, Multi-tissue models.|
Nature of problem:
DECOMP models multi-tissue nitrogen transport in divers breathing compressed air (80 per cent N2 and 20 per cent O2). Repetitive and multi-level (depth and time) activities are traced continuously in time. Computed nitrogen pressures are compared with critical values used to fabricate the U.S. Navy air tables. Extrapolation of critical nitrogen pressures to altitude is effected with an exponential barometer equation for air. Critical ratios (nitrogen pressure/ambient pressure) are also tabulated.
DECOMP employs analytic solutions to the bulk diffusion equations to predict nitrogen tensions in tissues of arbitrary half-life. In repetitive, multi-level applications, continuous tensions at the end of one stage form the initial values for the following stage. Ascent, or descent, rates can be used with an averaging technique to transport nitrogen between stages. The diffusion equation used to transport nitrogen treats tissues as uniform (bulk) media.
Calculations for six tissues in a 10 level excursion require less than a second.
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