DHIJWASv Software FEFLOW 6.1

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SK=cáåáíÉJbäÉãÉåí=jÉëÜ qÜÉ= qêá~åÖäÉ= ãÉëÜ ÖÉåÉê~íçê= ÉåÖáåÉ= áë åçí= éêçîáÇÉÇ= ïáíÜ cbcilt>= cçê= ÇÉí~áäë= ~Äçìí Üçï= íç= çÄí~áå= íÜÉ= qêá~åÖäÉ ãÉëÜ= ÖÉåÉê~íçêI= ëÉÉ= íÜÉ cbcilt=ÜÉäé=ëóëíÉãK PS=ö=rëÉê=j~åì~ä is activated before you leave the dialog. To select the elements to be refined go back to the Supermesh view and click on Refinement Selection. Click on all segments of the line and of the edge that separates the two polygons. The selected edges are shown in green. Then click on Generate Mesh again. The resulting finite-element mesh with local refinement is shown in figure 6.7. Next, we will apply the Triangle algorithm to generate a finite-element mesh. Choose Triangle from the generator list in the Mesh-Generator toolbar. Open the Generator Properties dialog and activate refinement for polygon edges, line and point elements with the following settings: Refinement around SELECTED polygon edges • Polygons: gradation: 5, target element size: 1.0 m • Lines: gradation: 3, target element size: 0.5 m • Points: gradation: 3, target element size: 0.5 m • Leave the dialog and use the Refinement Selection tool to select the edge between the two polygons in the Supermesh view. Clicking on Generate Mesh should now produce a finiteelement mesh that looks similar to the one on the left in figure 6.8. pÉé~ê~íÉ=bÇáíáåÖ=çÑ=mçäóÖçåë For every supermesh polygon the mesh density can be defined separately while the total number of elements remains constant. Go to the Supermesh view and activate the tool Edit Meshing Density in the Mesh-Generator toolbar. FEFLOW now automatically selects a polygon for which a meshing-density factor can be specified. Start with the proposed polygon and enter a factor of 10. After hitting the number in the input field turns red, indicating that the meshing density for this polygon has been modified. Proceed with the second polygon. Select it with a single click and enter a density factor of 2 in the input field. Hit again and start the mesh generation with a click on Generate Mesh. The right mesh in figure 6.8 shows the resulting finite-element mesh. To reset the meshing density factors to the default value of 1, click on Reset Meshing Density. Figure 6.8 Meshes generated with the Triangle algorithm. SKVKOKO nì~Ç=jÉëÜáåÖ A finite-element mesh with quadrilateral elements can be generated using the Transport Mapping algorithm. We load a new file which is similar to the one used for the triangulation exercises, except this supermesh consists of only one polygon that has exactly four nodes. Click on Open and load the file quadmesh.smh. Transport Mapping requires supermesh polygons with exactly four nodes. Lines and points are ignored in the mesh-generation process. To enable the quad meshing option go to Mesh
Figure 6.9 Quad mesh. and activate Quadrilateral Mode. Select Transport Mapping in the Mesh-Generator toolbar, enter a Total Number of 2000 elements and click on Generate Mesh to start the meshing process. The resulting finite-element mesh is shown in figure 6.9. SKVKP bÇáíáåÖ=íÜÉ=jÉëÜ=dÉçãÉíêó SKVKPKN qêá~åÖìä~ê=jÉëÜÉë For this exercise load the file triangle.fem. The geometry of the finite-element mesh can be edited after the mesh-generation process has been finished. All the necessary tools are located in the Mesh-Geometry toolbar. It is possible to refine the mesh globally (entire mesh) or locally (only selected parts). A derefinement option for previously refined parts of the mesh is also available. If we want to apply local mesh refinement we have to select a target area first. Make sure that the Slice view is the active view. All necessary selection tools can be found in the Selection toolbar. To create an element-based selection choose Select Elements from the drop-down list of target geometries. Then, activate Select in Rectangular Region tool from the drop-down list of selection tools to draw a rectangle around the line feature. Now click on Refine Elements in the Mesh-Geometry toolbar. Each selected element is subdivided into four elements. The result is shown in figure 6.10. The derefinement tool is used similarly; however, only those parts that were previously refined can be derefined. Elements can also be deleted from the finite-element mesh. Select a couple of elements and click on Delete Elements to cut out these elements. On the right hand side of figure 6.10 a (purely illustrative) example for a mesh with deleted elements is shown. Figure 6.10 Refinement and deleted elements. Mesh smoothing can produce more regularly shaped elements and reduce the number of obtuseangled triangles. To use the Smooth Mesh tool in the Mesh-Geometry toolbar, the nodes which are allowed to be moved during the smoothing process SKV=qìíçêá~ä cbcilt=SKN=ö=PT
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dataset, click on Edit borehole hea
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páãìä~íáçå Running a FEFLOW
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control and model parameters is pre
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Figure 11.5 Observation Point Prope
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Figure 12.5 Scaled budget spheres a
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To visualize the transient flow fie
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view in which we show how the mesh
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Open the Plug-ins panel via View >
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