NESC9850 STAFAN.

1. NAME OR DESIGNATION OF PROGRAM:  STAFAN.

3. DESCRIPTION OF PROGRAM OR FUNCTION

STAFAN (STress And Flow ANalysis) is a two-dimensional, finite-element code designed to model fluid flow and the interaction of fluid pressure and mechanical stresses in a fractured rock surrounding a nuclear waste  repository. STAFAN considers flow behavior of a deformable fractured system with fracture-porous matrix interactions, the coupling effects of fluid pressure and mechanical stresses in a medium containing discrete joints, and the inelastic response of the individual joints of the rock mass subject to the combined fluid pressure and mechanical loading.

4. METHOD OF SOLUTION:

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

STAFAN does not presently contain thermal coupling, and it is unable to simulate inelastic deformation of the rock mass and variably saturated or two-phase flow in the fractured porous medium system.

6. TYPICAL RUNNING TIME:

To run the test cases included in this package on a CDC CYBER 830 computer, between 29 and 89 CPU seconds were required.

7. UNUSUAL FEATURES OF THE PROGRAM

STAFAN is particularly suited to application in the study of flow and mechanical deformation processes around repository subsystems.

8. RELATED AND AUXILIARY PROGRAMS

STAFAN can be used in conjunction with a thermomechanical code such as MATLOC (NESC Summary R9851) or  UTAH2 (NESC Summary R9848) to assess the relative importance of thermomechanical effects and fluid-flow effects on the stress field  and rock deformation. STAFAN can also be used as a front-end code to perform fluid-flow analysis and provide velocity input data to the SCEPTER solute transport codes, such as FTRANS (NESC Summary R9860)  and SWENT (NESC Summary R9811).

10. REFERENCES:

- INTERA Environmental Consultants Inc. :
  STAFAN: Two-Dimensional Code for Fluid Flow and the Interaction of
  Fluid Pressure and Stress in Fractured Rock for Repository
  Performance Assessment
  ONWI-427 (April 1983)

11. MACHINE REQUIREMENTS:  58K words.

133,345 (octal) words of main storage (CM).

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:

NOS2.5.1 (CDC CYBER 830).

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

15. NAME AND ESTABLISHMENT OF AUTHORS

         P. Huyakorn
         GeoTrans, Inc.

         M.J. Golis
         Office of Nuclear Waste Isolation
         Battelle Project Management Division
         505 King Avenue
         Columbus, Ohio 43201
Contact

File name	File description	Records
NESC9850_01.001	Information file	51
NESC9850_01.002	JCL and control information	12
NESC9850_01.003	STAFAN FORTRAN source	2234
NESC9850_01.004	Sample problem 1 input	23
NESC9850_01.005	Sample problem 2 input	13
NESC9850_01.006	Sample problem 3 input	49
NESC9850_01.007	Sample problem 1 output	2949
NESC9850_01.008	Sample problem 2 output	3651
NESC9850_01.009	Sample problem 3 output	7115