| 1970 |
 Hydrologic Engineering Center, US-Army:
Finite Element Solution of Steady State Potential Flow Problems
The base of SPRING (formerly SICK 100)
|
| 1977 |
 Development of graphic routines to represent the results
State of the art in those days:
"Large computer" TR440
Input: punch cards, Output: lists
Limit of the program or the computer:
400 Elements/nodes,
100 Potentials,
20 different k-values,
Maximum band width: 50 (band width optimization "manually")
|
| 1979/80 |
Automatic calibration method with the help of the hydraulic gradient
Free surface in horizontal and vertical models
Data generator to reduce the manual input
Numeric and graphic data control to reduce input errors
|
| 1981 |
Stream line model for long-strechted aquifers (numeric problems of the potential model)
|
| 1982/83 |
 Automatic band width optimization
New equation solver (skyline-technique)
Digitizing data
Automatic interpolation of data to FE-mesh nodes
|
| 1984 |
 US Geological Survey/US Air Force:
SUTRA, Saturated-Unsaturated Transport
The base of the nowadays high-end-module SPRING-SITRA
|
| 1986/87 |
 3D representation of the model data and results
Multi-layer models
|
| 1988-91 |
Pre-processor SUSI (nowadays module XSUSI) for the graphic-interactive mesh generation with attribute assignment
|
| 1988-92 |
3D calculations with integrated data generation transport model - spreading of pollutants
|
| 1992 |
Development of the post-processor XPLT for the graphic representation, interactive modifying and output of results
|
| 1993-98 |
3D fracture generation, fracture-matrix-calculation
|
| 1994-96 |
Changing the pre- and post-processors XPLT and (X)SUSI from GKS to X11/Motif, complete graphic-interactive and batch-file controlled main-processing
|
| 1994-98 |
Multi-phase flow in heterogenious porous media
|
| 1995 |
Method of the inverse modeling
|
| 1998/99 |
Transient transport of nuclides
|
| 2000/01 |
Discrete calculation of cracks in gravity dams (hydrofracturing)
|
| 2002 |
Transport with inverse flow
|
| 2003 |
Flooding simulation of cavities (i.e. mines)
|
| 2004 |
Well controlling in the siphon line processe
|
| 2005 |
Zoning of parameters for the simulation of heat transport
|
| 2006 |
Considering transient evaporation rates in the transport calculation
|
| 2007 |
Re-injection of concentrations/temperatures
|
| 2008 |
Flow direction-related water systems with balancing the existing masses
|
| 2009 |
Derivation of water levels from the run-off specific flow (steady-state and transient)
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