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NESC0440 DYNAM

DYNAM, Once Through Boiling Flow with Steam Superheat, Laplace Transformation

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1. NAME OR DESIGNATION OF PROGRAM:  DYNAM
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2. COMPUTERS
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Program name Package id Status Status date
DYNAM NESC0440/01 Tested 01-JUL-1973

Machines used:

Package ID Orig. computer Test computer
NESC0440/01 IBM 370 series IBM 370 series
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3. DESCRIPTION OF PROBLEM OR FUNCTION

DYNAM   performs  a   dynamic
analysis  of once-through  boiling  flow  oscillations with  steam
superheat.  The  model describing  the  superheat regime  (single-
phase, variable density fluid)  for subcritical pressure operation
is also  applicable to the  study of once-through  operation using
supercritical pressure water.
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4. METHOD OF SOLUTION

Linearized partial  differential conservation
equations are solved using Laplace  transformation of the temporal
terms and integration of the spatial variations.  DYNAM is written
in complex variable notation.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Maxima of -
   30 intervals used to describe the power distribution in the
      nonboiling and boiling regions
   29 boiling nodes
    7 intervals and corresponding friction multipliers read in
      per case
   14 exit qualities read in per case
   40 superheat nodes
   10 coefficients read in for the phi**2 vs, x-polynomial fit
   48 frequencies at which open-loop frequency response is desired
   48 frequencies at which signal output is desired
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6. TYPICAL RUNNING TIME:  A typical problem requires 5 seconds.
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7. UNUSUAL FEATURES OF THE PROGRAM:  No  numerical instabilities  are
present.
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8. RELATED AND AUXILIARY PROGRAMS:  STABLE
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9. STATUS
Package ID Status date Status
NESC0440/01 01-JUL-1973 Tested at NEADB
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10. REFERENCES

L. E.  Efferding, DYNAM,  A Digital  Computer Program
for Study  of the Dynamic  Stability of Once-Through  Boiling Flow
with Steam Superheat, GAMD-8656, June 26, 1968.
             L.  E. Efferding,  Static  and  Dynamic Stability  of
Steam-Water Systems -  Part I, Critical Review  of the Literature,
GA-5555, October 1964.
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11. MACHINE REQUIREMENTS:
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NESC0440/01 FORTRAN-IV
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:   EXEC2.
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

   The
test case results will differ from those in the document GAMD-8656
due to modification of the pressure-drop equations.
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15. NAME AND ESTABLISHMENT OF AUTHORS

   Abstract      G. Schlueter
   Program       L. E. Efferding
                 General Atomic Company
                 P. O. Box 81608
                 San Diego, California  92138
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16. MATERIAL AVAILABLE
NESC0440/01
File name File description Records
NESC0440_01.001 SOURCE PROGRAM (FORTRAN) 1208
NESC0440_01.002 SAMPLE INPUT 31
NESC0440_01.003 SAMPLE OUTPUT 343
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17. CATEGORIES
  • H. Heat Transfer and Fluid Flow

Keywords: fluid flow, hydrodynamics, pressure, steam generators, transfer functions, variations.