STEADY DARCIAN TRANSPORT OF FLUIDS IN HETEROGENEOUS PARTIALLY SATURATED POROUS MEDIA PART 2 THE COMPUTER PROGRAM

摘要

The computer program —"Steady Darcian Flow in Soils"—provides a means of obtaining numerical solutions to problems in the general class involving steady flow through porous media. Based on the mathematical and numerical treatment presented in Part 1, the program was designed to handle the widest possible variety of boundary conditions. Potential distri¬butions in saturated and partially-saturated, homogeneous or heterogeneous soils may be obtained. Combined saturated and partially-saturated flow cases may also be solved, since the equations used for one part are reducible to solve the other. Such a solution proceeds smoothly with little concern for the water table position which can be located easily in the problem solution. Moisture contents may be obtained from the results.nThe program was written for the IBM 7090 in FORTRAN and FAP languages. It can solve one-, two-, and three-dimensional and axisymmetrical problems with up to 8000 grid points. As many as 15 different soils may be included in a heterogeneous, partially-saturated flow problem.nOptimum underrelaxation and overrelaxation techniques are used to increase the speed of convergence and to maintain stability. Other methods of maintaining stability are also discussed.