feflow_user_manual_classic.pdf

Is selected the working window is automati cally

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is selected, the working window is automati- cally zoomed to the selected superelement. Activating Area sorting changes the order of mesh generation: Normally the mesh is generated in the same order in which you have drawn the superelements. If the Area sorting option is active, the mesh is generated in the order of the superelement area, from the smallest element to the largest one. The triangulator can occasionally fail for an inap- propriate subdivision of superelement edges. In this case, the generator stops and an alert box presents dif- ferent ways to continue. Your choices are: • repeat the triangulation for the last superelement, • start over from the beginning, or • break the generation process. Sometimes, a repeated generation for the same sub- division is successful, because the generator dynami- cally increases the number of iterations and allocates larger working arrays. QKQ dÉåÉê~íÉ dê~Çì~ääó Click on Generate gradually to start. This option allows you to input the num- ber of finite elements along each edge of a superelement. The current superelement edge is indicated by an arrow. Note that for edges shared by two superelements the number of elements has to be the same on both sides. Therefore an input is required only once. This function only works with the Transport map- ping and Advancing front meshing methods as described in Section 4.5. QKR dÉåÉê~íçê léíáçåë The Generator options item defines rules for the generation of the finite-element mesh. FEFLOW implements five different mesh genera- tors: Transport mapping for quadrilateral elements, Advancing front (without considering add-ins), Triangle (interface), Gridbuilder and TMesh . For Triangle, an easy-to use interface is provided (Triangle copyright by J. R. Shewchuk, University of California at Berkeley). Figure 4.1 Generate areally.
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cbcilt SKM `ä~ëëáÅ ö PR QKR dÉåÉê~íçê léíáçåë qê~åëéçêí ã~ééáåÖL~Çî~åÅáåÖ Ñêçåí Transport mapping creates quadrilateral finite ele- ments while Advancing front is a mesh generator for triangular finite elements. Having selected one of these tools the menu displays the options as described below: Iteration number for triangular-mesh smooth- ing : Set the value higher if you want a better mesh smoothing, but be aware that it might take much more time, especially if the number of elements is large. Only valid for Advancing front meshing. Triangulation based on quadrilateral super- mesh elements : A triangle mesh will be generated which is similar to a quadrilateral mesh where each quadrilateral element is subdivided into two triangles. With this option you get a very regular distribution of finite elements. Only valid for Advancing front meshing tool and quadrilateral superelements.
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