NESC0440 DYNAM

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

NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROBLEM OR FUNCTION, METHOD OF SOLUTION, RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM, TYPICAL RUNNING TIME, UNUSUAL FEATURES OF THE PROGRAM, RELATED AND AUXILIARY PROGRAMS, STATUS, REFERENCES, MACHINE REQUIREMENTS, LANGUAGE, OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED, OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHORS, MATERIAL, CATEGORIES

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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.