NESC0832 SOLA-DF.

1. NAME OR DESIGNATION OF PROGRAM:  SOLA-DF.

3. DESCRIPTION OF PROBLEM OR FUNCTION

SOLA-DF is a numerical solution algorithm for gas-liquid mixture dynamics in two space dimensions and time. The two-phase system is described by a set of mixture equations plus a relation describing the relative flow of one phase  with respect to the other. The algorithm contains models to represent the interphase exchange rates of mass, momentum, and energy for water system mixtures.

4. METHOD OF SOLUTION

SOLA-DF uses a finite-difference technique, which includes the Implicit Continuous-fluid Eulerian (ICE) method as an optional feature, to solve the drift-flux equations of two phase flow in two-dimensional plane or cylindrical coordinates.
A wide variety of boundary conditions are possible, including free-slip, no-slip, specified inflow-outflow, continuative outflow,  periodic, and constant pressure boundaries. Implicit pressure gradients are used to eliminate the Courant condition as a stability requirements, making the code useful at all Mach numbers.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Simple equation of state, relative velocity model and phase transition model are assumed. When large phase transition rates are present, because of the decoupled calculation of phase change and the pressure iteration, care must be exercised to make sure the solution is independent of the time-step.

6. TYPICAL RUNNING TIME

The "grind" time, or time to advance the solution in one cell by one time-step, is typically 0.5 to 1.0 ms on a CDC7600. NESC executed the sample problem in less than 8 CP minutes on a CDC7600.

7. UNUSUAL FEATURES OF THE PROGRAM

SOLA-DF is designed to be easy to understand and modify so it can serve as a foundation for code development.

8. RELATED AND AUXILIARY PROGRAMS

The solution algorithm has evolved  from earlier SOLA series programs. The original SOLA was designed for problems involving a single, incompressible fluid in a fixed region. SOLA-SURF (NESC Abstract 651) is an extension which allows for the inclusion of free surfaces. SOLA-ICE (NESC Abstract 723) was designed to handle single-component, compressible fluids.
SOLA-DF  is a direct descendant of SOLA-ICE.
A variation of SOLA-DF is contained in SOLA-LOOP (NESC Abstrac 859), a network code, which handles systems of one-dimensional components  coupled through junctions. K-FIX (NESC Abstract 727) calculates the  transient dynamics of two-dimensional, two-phase flow with inter- facial exchange.

10. REFERENCES

- C.W. Hirt and N.C. Romero,
  Application of a Drift-Flux Model to Flashing in Straight Pipes,
  LA-6005-MS, July 1975.

- C.W. Hirt N.C. Romero, M.D. Torrey, and J.R. Travis:
  SOLA-DF: A Solution Algorithm for Nonequilibrium Two-Phase Flow,
  NUREG/CR-0690 (LA-7725-MS), (June 1979).
- R.M. Frank:
  J506 Advance Subroutine,
  J523 Draw Frame Subroutine,
  J563 Contour Plotting with Film Output Subroutine,
  LASL Program Library Write-up (January 1979).
- S.T. Bennion:
  J517 Draw Vector Subroutine,
  J526 Convert Coordinate Subroutine,
  J528 Define Graph Area Subroutine,
  LASL Program Library Write-up (January 1979).
- V. Gardiner:
  J508 Standardized Plot Subroutine,
  LASL Program Library Write-up (January 1979).
- SOLA-DF NESC No. 832.7600, Errata to LA-7725-MS Input Description,
  NESC Note 80-06 (July 9, 1979).
- C.W. Hirt N.C. Romero, M.D. Torrey, and J.R. Travis:
  SOLA-DF: A Solution Algorithm for Nonequilibrium Two-Phase Flow,
  NUREG/CR-0690 (LA-7725-MS), (June 1979).
- R.M. Frank:
  J506 Advance Subroutine,
  J523 Draw Frame Subroutine,
  J563 Contour Plotting with Film Output Subroutine,
  LASL Program Library Write-up (January 1979).
- S.T. Bennion:
  J517 Draw Vector Subroutine,
  J526 Convert Coordinate Subroutine,
  J528 Define Graph Area Subroutine,
  LASL Program Library Write-up (January 1979).
- V. Gardiner:
  J508 Standardized Plot Subroutine,
  LASL Program Library Write-up (January 1979).
- SOLA-DF NESC No. 832.7600, Errata to LA-7725-MS Input Description,
  NESC Note 80-06 (July 9, 1979).

11. MACHINE REQUIREMENTS

124000 (octal) words of memory are required for execution.

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

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

SOLA-DF calls a number of LASL film plotting subroutines - ADV, CONTRJB, CONVRT, DGA, DRV, FRAME, LINCNT, and SPLOT. NESC supplied DUMMY routines for completeness. To duplicate the results in the report the ROUND option should be specified for the compiler. If ROUND is not specified, the results are printed at different time intervals.

15. NAME AND ESTABLISHMENT OF AUTHOR

            C.W. Hirth, N.C. Romero, M.D. Torrey,
            and J.R. Travis *
            Theoretical Division
            Los Alamos Scientific Laboratory
            P.O. Box 1663
            Los Alamos, New Mexico 87545
* Contact

File name	File description	Records
NESC0832_01.001	INFORMATION	5
NESC0832_01.002	SOURCE (F4,EBCDIC)	1401
NESC0832_01.003	INPUT DATA FOR SAMPLE PROBLEM	20
NESC0832_01.004	PRINTED OUTPUT OF SAMPLE PROBLEM	5908

File name	File description	Records
NESC0832_02.001	Information file	32
NESC0832_02.002	SOLA-DF source program (FORTRAN)	1422
NESC0832_02.003	SOLA-DF test case input data	20
NESC0832_02.004	SOLA-DF test case printed output	5908