TOPAZ-SNLL, the Transient One- dimensional Pipe flow AnalyZer code, is a user-friendly computer program for modeling the heat transfer, fluid mechanics, and thermodynamics of multi-species gas transfer in arbitrary arrangements of pipes, valves, vessels, and flow branches. Although the flow conservation equations are assumed to be one-dimensional and transient, multidimensional features of internal fluid flow and heat transfer may be accounted for using the available quasi-steady flow correlations (e.g., Moody friction factor correlation and various form loss and heat transfer correlations). Users may also model the effects of moving system boundaries such as pistons, diaphragms, and bladders. The features of fully compressible flow are modeled, including the propagation of shocks and rarefaction waves, as well as the establishment of multiple choke points along the flow path.
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Software Package Contents:
Media Directory; Software Abstract; Media includes Source Code;/1 CD ROM
Source Code Available:
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The sequence of subroutines beginning with ESINIT and ending with ZROCHK are only called when the MIXT=3 flag (REGION minor directive) is used to specify the Clark-Ashurst five species model of hydrogen- helium isotopes. These routines were written by Gary Clark, now at Los Alamos National Laboratory in Los Alamos, New Mexico (USA). While these are the most accurate equation of state routines for hydrogen-helium isotope mixtures, it is not recommended that they be used in transient gas transfer calculations with TOPAZ. Such calculations are extremely time consuming compared to the other avalaible models (MIXT=l,2,4,5) and the subroutines ESINIT through ZROCHK do not have sufficient error trapping to prevent the calculation of fictitious states (negative pressures, etc.) while the code is iterating to the final solution. The MIXT3 option is most useful in checking initial and final states for accuracy, e.g. comparing the state calculated by MIXT=l to the state calculated by the more accurate MIXT=3 option. The results obtained at NEA-DB with input file for Example 3 (page 31 of the report SAND85-8215) are different from those printed on page 45 of the same report. We are asking the author for clarification. However for Example 8 included in the original package, we do not have a sample output for comparison.
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