NESC9644 NASA-VOF2D.

1. NAME OR DESIGNATION OF PROGRAM:  NASA-VOF2D.

3. DESCRIPTION OF PROGRAM OR FUNCTION

NASA-VOF2D is a two- dimensional, transient, free surface incompressible fluid dynamics program. It allows multiple free surfaces with surface tension and wall adhesion forces and has a partial cell treatment which allows curved boundaries and interior obstacles.

4. METHOD OF SOLUTION

NASA-VOF2D simulates incompressible flows with  free surfaces using the volume-of-fluid (VOF) algorithm. This technique is based on the use of donor-acceptor differencing to track the free surface across an Eulerian grid. The complete Navier-Stokes equations in primitive variables for an incompressible fluid are solved by finite differences with surface tension and wall adhesion included. Optionally the pressure equation can be solved by a conjugate residual method rather than the successive overrelaxation (SOR) method.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM:

6. TYPICAL RUNNING TIME:

The test case included in this package has been executed by the NEA Data Bank on a CRAY-XMP/2000 SERIAL-113 computer in 2 seconds of CPU time.

7. UNUSUAL FEATURES OF THE PROGRAM

NASA-VOF2D is highly structured so that individual components may be easily modified to fit specific problem requirements or to accept subsequent code upgrades.

8. RELATED AND AUXILIARY PROGRAMS

The numerical method used in NASA-VOF2D is an extension of the method used in SOLA-VOF (NESC 948) and NASA SOLA-VOF.

10. REFERENCES

- NASA-VOF2D, NESC No. 9644, NASA-VOF2D Tape Description and
  Implementation Information,
  National Energy Software Center Note 86-71, July 6, 1986.
- B. Nichols, C.W. Hirt, and R.S. Hotchkiss
  SOLA-VOF: A Solution Algorithm for Transient Fluid Flow with
  Multiple Free Boundaries,
  LA-8355, August 1980.
- R.S. Hotchkiss
Simulation of Tank Draining Phenomena with the NASA SOLA-VOF Code,    LA-8163-MS, December 1979.

- M.D. Torrey, L.D. Cloutman, R.C. Mjolsness and C.W. Hirt:
  NASA-VOF2D: A Computer Program for Incompressible Flows
  with Free Surfaces.
  LA-10612-MS  (December 1985)

11. MACHINE REQUIREMENTS:  3 units in addition to the standard input/output units.

Execution of the test case on a CRAY-XMP/2000 computer  required 143,872 words of main storage.

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:

COS 1.15 with compiler CFT 1.14 (CRAY-XMP/2000).

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

NASA-VOF2D contains calls to several system-dependent plotting routines and a time limit routine. These are not included, and users must supply their own equivalent routines. NASA-VOF2D can run many problems without modification, but a specific application may require changes to the logic for special inflow or outflow ports, complicated geometries, or unusual conditions. These are accomplished by using the UPDATE utility.

15. NAME AND ESTABLISHMENT OF AUTHORS

           M.D. Torrey
           Los Alamos National Laboratory

File name	File description	Records
NESC9644_01.001	Information file	56
NESC9644_01.002	JCL and control information	23
NESC9644_01.003	NASA-VOF2D UPDATE source	3743
NESC9644_01.004	NASA-VOF2D source updates	41
NESC9644_01.005	NASA-VOF2D dummy routines	43
NESC9644_01.006	NASA-VOF2D Sample problem input	18
NESC9644_01.007	NASA-VOF2D Sample problem output	1550