NESC0720 RICE-LASL

1. NAME OR DESIGNATION OF PROGRAM:  RICE-LASL

3. DESCRIPTION OF PROBLEM OR FUNCTION

The    fluid   dynamics    of
chemically  reactive mixtures  are  calculated  at arbitrary  flow
speeds  with  the  RICE-LASL  program.   Application  is  made  to
continuous  wave HF  chemical  lasers  to compute  the  supersonic
mixing  and  chemical reactions  that  take  place in  the  lasing
cavity.

4. METHOD OF SOLUTION

The dynamics   are  governed   by  the   two-
dimensional, time-dependent Navier-Stokes  equations together with
the species transport equations and the mass-action rate equations
for the chemical  reactions.  The mass and  momentum equations for
the mixture are solved implicitly by the Implicit Continuous-fluid
Eulerian  (ICE) technique.   The equations  for  total energy  and
species transport  are solved explicitly  while the  chemical rate
equations are  solved implicitly  with a time-step  that may  be a
submultiple of the hydrodynamic time-step.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM:

6. TYPICAL RUNNING TIME

0.0006 seconds of CDC7600 time/cell/cycle for single component fluids is required. This varies with increased species and chemical reaction.

NEA-DB executed the test case included in this package  on a CDC CYBER 740 computer in 64 seconds of CPU time.

7. UNUSUAL FEATURES OF THE PROGRAM

RICE-LASL allows  triangular and
rectangular obstacles, with  or without inflow boundaries,  in the
computing mesh.

8. RELATED AND AUXILIARY PROGRAMS:

10. REFERENCES

W. C.  Rivard, O. A. Farmer,  T. D. Butler,  RICE:  A
Computer Program  for Multicomponent Chemically Reactive  Flows at
All Speeds, LA-5812, March 1975.
             Note to LA-5812, User Information, July 23, 1975.

- W.C. Rivard, O.A. Farmer, T.D. Butler:
  RICE: A Computer Program for Multicomponent Chemically Reactive
  Flows at All Speeds
  LA-5812  (March 1975)
- User Information
  Note to LA-5812  (July 23, 1975)

11. MACHINE REQUIREMENTS:

To run the test case on a CDC CYBER 740 computer, 203,300 (octal) words of main storage are required.

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  LASL CROS system.

NOS 1.4-531 (CDC CYBER 740).

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

Calls to DATAREL  and to most plotting routines  have been changed
to comments.

15. NAME AND ESTABLISHMENT OF AUTHORS

                 W. C. Rivard, O. A. Farmer, and T. D. Butler
                 Los Alamos Scientific Laboratory
                 P. O. Box 1663
                 Los Alamos, New Mexico  87544

File name	File description	Records
NESC0720_01.001	Information file	56
NESC0720_01.002	RICE LASL Source program	2836
NESC0720_01.003	RICE LASL JCL	13
NESC0720_01.004	RICE-LASL dummy routine	31
NESC0720_01.005	RICE-LASL auxiliary program	24
NESC0720_01.006	RICE-LASL sample problem input	30
NESC0720_01.007	RICE-LASL sample problem output	8398