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Analysis of nonlinearities in ground water hydrology: A hybrid computer approach
Author(s) -
Vemuri Venkateswararao,
Dracup John A.
Publication year - 1967
Publication title -
water resources research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.863
H-Index - 217
eISSN - 1944-7973
pISSN - 0043-1397
DOI - 10.1029/wr003i004p01047
Subject(s) - computation , subroutine , hybrid computer , nonlinear system , computer science , chart , flow chart , inversion (geology) , computer program , algorithm , analog computer , computational science , control engineering , mathematics , engineering , electrical engineering , geology , paleontology , statistics , physics , quantum mechanics , structural basin , operating system
A hybrid computer method to solve nonlinear partial differential equations describing the flow of fluids in underground formations is described. Using finite difference methods, the problems are first programmed by a flow chart for a pure digital computer solution. Because the ability of resistance networks to solve a set of simultaneous equations instantaneously is recognized, major matrix inversion subroutines in the digital flow chart are replaced by analog resistance network hardware. Incorporation of analog hardware drastically reduces the computation time involved in inversion of large matrices. The resistance network constructed on an analog computer patch board allows an unparalleled flexibility not available in a digital computer.