NEA-0864 CLUHET.

CLUHET, Steady-State Thermohydraulics of Rod Bundles with 1 Phase Flow

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

[ top ]

1. NAME OR DESIGNATION OF PROGRAM: CLUHET.

[ top ]

2. COMPUTERS

To submit a request, click below on the link of the version you wish to order. Only liaison officers are authorised to submit online requests. Rules for requesters are available here.

Program name	Package id	Status	Status date
CLUHET	NEA-0864/01	Tested	07-MAR-1986

Machines used:

Package ID	Orig. computer	Test computer
NEA-0864/01	CDC CYBER 720	CDC CYBER 740

[ top ]

3. DESCRIPTION OF PROBLEM OR FUNCTION

Steady-state thermo-hydraulic calculations in heated rod bundles with single phase flow. Conduction heat transfer in the rods and radiation heat transfer between the pins.

[ top ]

4. METHOD OF SOLUTION

Gaussian elimination with total or partial pivoting for the fluid thermal-hydraulic calculations (marching forward), and overrelaxed finite differences technique for the heat conduction.

[ top ]

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM:
Maximum 100 rods and 100 subchannels in the bundle.

[ top ]

6. TYPICAL RUNNING TIME

15 to 30 CP seconds per rod and per meter of length in adiabatic cases (unheated). 120 to 300 CP seconds in heated cases using all options.

NEA-0864/01

NEA-DB executed the test case included in this package on a CDC CYBER 740 computer in 350 seconds of CPU time.

[ top ]

7. UNUSUAL FEATURES OF THE PROGRAM

Local effects (e.g. blockages)
cross flow
automatic axial step length definition
three gases thermophysical properties available (Helium, air,
Carbon dioxide)
friction and heat transfer properties of artificially roughened surfaces available.

[ top ]

8. RELATED AND AUXILIARY PROGRAMS

SCRIMP
PRICOR to modify data on the restart file
CLUPLO to prepare the plot data from the corresponding CLUHET file

[ top ]

9. STATUS

Package ID	Status date	Status
NEA-0864/01	07-MAR-1986	Tested at NEADB

[ top ]

10. REFERENCES:

NEA-0864/01, included references:

- P. Barroyer:
CLUHET - A Computer Code for Steady State Thermal-Hydraulic
Calculations in Heated Rod Bundles. EIR-Bericht Nr. 437 (Sept. 81)

[ top ]

11. MACHINE REQUIREMENTS

Central memory: 143100 words
TAPE1:   Disk file for plot data storage
TAPE11: Disk file for restart data storage (must be available for          restart case
TAPE2:   Scratch file for local data storage
TAPE25:  Scratch file for local data storage

NEA-0864/01

To run the test case on CDC CYBER 740, 142,100 (octal) words of CM are required.

[ top ]

12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
NEA-0864/01	FORTRAN-IV

[ top ]

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED

MCPA library subroutine defines calculation time and limits execution time.

NEA-0864/01

The test case was run under NOS 1.4+531 (CYBER 740).

[ top ]

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

Differences in static pressures and specific enthalpies as well as direct Gaussian elimination procedure necessitate high precision calculation algorithm. Difficulties may be encountered when adapting CLUHET to computers other than CDC.

[ top ]

15. NAME AND ESTABLISHMENT OF AUTHOR

Paul Barroyer
Swiss Federal Institute for Reactor Research
5303 WUERENLINGEN (Switzerland)

[ top ]

16. MATERIAL AVAILABLE

NEA-0864/01

File name	File description	Records
NEA0864_01.001	information file	50
NEA0864_01.002	job control commands	15
NEA0864_01.003	CLUHET source program	9215
NEA0864_01.004	MCPA dummy subroutine	3
NEA0864_01.005	CLUHET test case input data	279
NEA0864_01.006	CLUHET test case printed output	22786

[ top ]

17. CATEGORIES

H. Heat Transfer and Fluid Flow

Keywords: fuel rods, heat transfer, hydraulics, radiation heat, rod bundles, thermal analysis, thermal conduction.