NESC0876 K-TIF.

K-TIF, Thermohydraulic Dynamic of PWR in Steady-State and Transient Flow Conditions

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 AUTHOR, MATERIAL, CATEGORIES

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1. NAME OR DESIGNATION OF PROGRAM: K-TIF.

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2. COMPUTERS

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Program name	Package id	Status	Status date
K-TIF	NESC0876/01	Tested	05-JAN-1989

Machines used:

Package ID	Orig. computer	Test computer
NESC0876/01	CDC 7600	CDC CYBER 830

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3. DESCRIPTION OF PROBLEM OR FUNCTION

K-TIF was developed for the numerical solution of the time-varying dynamics of steam and water in a pressurized water reactor (PWR) downcomer. The model is designed to describe the complicated countercurrent flow under start up, steady state and transient flow conditions covering as wide a set of experimental configurations as possible.

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4. METHOD OF SOLUTION

The differential equations of two-phase flow are solved by a finite-difference technique. The formulation requires the introduction of effective mixture and exchange functions. The walls that surround the computing region are typical representations of free-slip rigid walls along the top and bottom, and periodic boundary conditions connect the two sides.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

The material speeds are assumed to be much smaller than the sound speed at each point so that the microscopic material density for each phase is independent of position.

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6. TYPICAL RUNNING TIME

NESC executed the sample problem in 220 CP seconds. Level 2 optimization was used for compilation.

NESC0876/01

The test case ran at NEA-DB on a CYBER 830 computer in 881 seconds of CPU time.

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7. UNUSUAL FEATURES OF THE PROGRAM:

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8. RELATED AND AUXILIARY PROGRAMS:

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9. STATUS

Package ID	Status date	Status
NESC0876/01	05-JAN-1989	Tested at NEADB

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10. REFERENCES:

NESC0876/01, included references:

- A. A. Amsden and F. H. Harlow :
  K-TIF : A Two-Fluid Computer Program for Downcomer Flow Dynamics
  LA-6994 NRC-4 (January 1978)
- K-TIF Transmittal Tape and Sample Problem
  NESC Note 81-68 (August 7, 1981)

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11. MACHINE REQUIREMENTS

31,000 (octal) words of small core memory (SCM) and 28,000 (octal) words of large core memory (LCM).

NESC0876/01

To run the test case on a CYBER 830 computer, 51157 (octal) words of main storage (CM) were required.

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
NESC0876/01	FORTRAN

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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED: LTSS, SCOPE.

NESC0876/01

NOS2.5.1 (CYBER 830).

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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

K-TIF
calls a number of LANL system film plotting routines - ADV, COLOR, DRV, FRAME, LINCNT, PLT and LTSS system routines ASSIGN, CFL, DEVICE, EMPTY, FILM80, GETJTL, HEAD80, IDENT80, INSIST, KEEPFLM, UNQCHG. Dummy routines were supplied by NESC for completeness. Replacement subroutines appropriate in the user's computing environment will have to be provided.

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15. NAME AND ESTABLISHMENT OF AUTHOR

             A.A. Amsden* and F.H. Harlow
             Los Alamos National Laboratory
             P.O. Box 1663
             Los Alamos, New Mexico 87545
* Contact

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16. MATERIAL AVAILABLE

NESC0876/01

File name	File description	Records
NESC0876_01.001	Information file	46
NESC0876_01.002	JCL and control information	8
NESC0876_01.003	K-TIF FORTRAN source in compiler-ready form	2443
NESC0876_01.004	K-TIF FORTRAN source in CDC Update-util.form	1838
NESC0876_01.005	Sample problem input	18
NESC0876_01.006	Sample problem output	1494

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17. CATEGORIES

H. Heat Transfer and Fluid Flow

Keywords: finite difference method, pwr reactors, steady-state conditions, steam, transients, two-phase flow, water.