[img]http://www.ggu-software.com/software/ggu-computation/transient/grundwassermodell_1.gif[/img]For a transient calculation of groundwater flow, a stable initial condition is required. This initial condition is found by the program GGU-TRANSIENT from a file (e.g. PLGW.DA1) which is created from a previous analysis undertaken with the program GGU-SS FLOW 2D. This data must be loaded as the first action after starting the program. In addition to the analysis results, the data file also contains the relevant soil and input parameters for the analysis.These fundamental parameters (e.g. k, neff etc.) cannot be modified in the GGU-TRANSIENT program. If they are altered, then the soil parameters will no longer match the potentials and flows, and the transient calculations will be meaningless. Of course, for all groundwater flow problems (planar vertical, planar horizontal and axisymmetric), it is necessary to input parameters which are appropriate for a transient flow calculation.In addition to soil parameters, time-dependent boundary conditions can be defined for the transient program. Time dependent boundary conditions (potential or flow) are entered as polynomial functions. These polynomial functions can be defined at single or multiple system nodes. These (transient) soil parameters and polynomials can be saved in a separate boundary data file, to be available for a subsequent calculation. Boundary conditions that were defined in the course of the GGU-SS FLOW 2D calculation, are automatically saved in the input data file (e.g. PLGW.DA1). These are assumed to be constant for the duration of the calculation in GGU-TRANSIENT, unless they are specifically cancelled in the program GGU-TRANSIENT. The program GGU-TRANSIENT allows one to view the initial static conditions (e.g. PLGW.DA1) on the screen to enable confirmation that the correct system is being solved.The GGU-TRANSIENT program is not able to display the transient results. The output program GGU-PLGW is available for this purpose.

Product:GGU Transient v4.10

Lanaguage:english

Platform:Winxp/Win7

Size:1.8MB