Part IIDemonstration ExerciseScope and StructureFEFLOWGetting StartedWASY301Scope and StructureThe scope of this tutorial is to introduce the novice user to the philosophy of modelingthree dimensional flow and transport problems based on real world data with the help ofFEFLOW. The following steps define the tutorial procedure:Step 1 - Design the basic structure of the model using background maps as tem-plates to generate the supermesh and the finite element mesh. Step 2 - Develop the model into a 3-Dimensional structure. Step 3 - Assigning flow initials, boundary conditions, material parameters, etc.Step 4 - Run the simulationStep 5 - Postprocessing that features analyzing the model results and data export.For the installation of FEFLOW please refer to the booklet of the FEFLOW CD-ROM.Note: You can skip any one of the steps in this excercise by loading the problem files that are already prepared. These files are not ready to run in the simulator, you have to complete them first. For complete files install the sample data tutorial and benchmarks from the CD-ROM.1.1Terms and NotationsFor the purposes of this demo, the following terms and notations will be used:?Press the keytClick on the toggle beneath the indicated option.FClick the left mouse button where indicatedSwitchSwitch a button from one option to another, by clicking on it, holding the mouse button down, moving the cursor on the indicated option and releasing the button.Demonstration ExerciseFEFLOWGetting StartedWASY311.2Starting FEFLOWOn Windows NT/95/98Start FEFLOW via the WASY entry in the Programs folder of the Windows Startmenu.F FEFLOW DemoFEFLOW will start in the demo mode. On UnixType feflow -demo and hit the key.The Main Window of FEFLOW will be displayed on your screen. You are now in the FE-FLOW demo mode. The demo mode does not allow you to save any files or to open un-registered files.1.3Model ScenarioA fictitious contaminant plume has been detected near the small town of Friedrichs-hagen, southeast of Berlin, Germany. An increased concentration of a contamination hasbeen found in the towns two drinking water wells. There are two potential sources of thecontamination; the first is the sewage treatment plant located in an industrial area situat-ed to the northwest of the town. The other option is a wastewater disposal site found tothe northeast of Friedrichshagen.For studying the groundwater threat and potential pollution, we need to design, run, andcalibrate a three-dimensional groundwater flow and contaminant transport model of thearea. First we need to define the model domain. The town is situated in the middle ofmany natural flow boundaries, such as rivers and lakes. There are two rivers that runnorth-south on either side of Friedrichshagen that can act as the eastern and westernboundaries. The lake Mueggelsee will limit the model domain to the south. The northernboundary runs along an east-west flowline north of the two potential sources of the con-taminant.The geology of the model domain is comprised of Quaternary sediments. The hydrogeo-logic system concerns two aquifers separated by a clay aquitard. The top hydrostrati-graphic unit is considered to be a sandy unconfined aquifer up to 7 meters thick.Thesecond aquifer located below the clayey aquitard has a thickness of 30 meters. Thenorthern part of the model area is primarily used for agriculture, whereas the southernportion is dominated by forest.Scope and StructureFEFLOWGetting StartedWASY32NOTE: This map was created by importing GIS data for the model into FEPLOT, a plotting & desktop mapping tool made by WASY, which is included on the FEFLOW CDROM. FEFLOW supports the ESRI shape file format, Arc/Info compatible ASCII formats, DXF and FEFLOW specific plot formats for displaying background maps and exporting data. Figure 1.1: Site View of the Model DomainRiverNeuenhagenerRiverFriedrichshagenerMhlenflie?Mhlenflie?Demonstration ExerciseFEFLOWGetting StartedWASY332Step 1 - Basic StructureTo define the outer borders of the finite element model, a superelement mesh must bedigitized. The superelement mesh will provide the basic structure of the model. Design-ing the superelement mesh is accomplished via the Mesh Editor located in the Editmenu of the Shell.To enter the Mesh Editor,FEdit in the top bar of the Shell menuFDesign superelement meshThe Mesh Editor menu appears along the lefthand side of the window.To construct the super-element mesh, we need to load the backgroundmaps and use them as templates. This can be ac-complished by using the Quick Access menu.Click anywhere on the green colored part of thescreen. The Quick Access menu should appear. Holding the left mouse button, select Add map . from the menu.The FEFLOW File Selector appears. The upper-most field, called theFilter , displays the currentdirectory path. FEFLOW automatically searchesfor data in the directory called import+export.The Maptype field allows you to choose be-tween different map formats.The Files field dis。