tg11 - INDUSTRIAL DRILL BITSTEP GEOMETRY 11. INDUSTRIAL...

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INDUSTRIAL DRILL BIT—STEP GEOMETRY © Fluent Inc., Sep-04 11-1 11. INDUSTRIAL DRILL BIT—STEP GEOMETRY This tutorial employs a model of an industrial drill bit to illustrate GAMBIT operations that allow you to import and clean up STEP geometry, modify the model to suppress fea- tures that can adversely affect meshing, and control mesh quality. The STEP data file that describes the drill-bit geometry used in this tutorial was created by means of an external CAD package. In this tutorial, you will learn how to: Import STEP geometry Employ GAMBIT cleanup operations to clean up imported geometry and suppress model features that inhibit meshing Create and apply size functions to control mesh quality NOTE : You can reproduce the perspectives of the figures in this tutorial by means of window matrix commands available in a journal file named “ tg11_figures.jou ,” which is included in the “ help/tutfiles ” online help directory. To exactly reproduce the perspective of any figure, you can open the journal file and execute the window matrix command associated with the figure. For example, the following command repro- duces the perspective of the model shown in Figure 11-3. window matrix 1 entries \ 0.8298196196556 0.1376460045576 -0.5407903790474 \ -0.98521900177 -0.3953186273575 0.828989803791 \ -0.3955990076065 -0.0812062472105 0.3938567638397 \ 0.5420601963997 0.742325425148 -3.794617891312 \ -12.15634346008 12.11377906799 -4.06431388855 \ 15.50736236572 -22.28459358215 22.28459358215 11.1 Prerequisites Prior to reading and performing the steps outlined in this tutorial, you should familiarize yourself with the steps, principles, and procedures described in Tutorials 1, 2, 3, and 4.

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Problem Description INDUSTRIAL DRILL BIT—STEP GEOMETRY 11-2 © Fluent Inc., Sep-04 11.2 Problem Description Figure 11-1 and Figure 11-2 show the drill-bit configuration to be modeled and meshed in this tutorial. Figure 11-1 shows the full model, including the outer face that circumscribes the internal components. Figure 11-2 shows the internal components, themselves. Figure 11-1: Industrial drill bit configuration—full model
Problem Description © Fluent Inc., Sep-04 11-3 Figure 11-2: Industrial drill bit configuration—internal components The goals of this tutorial are: To import the model by means of a STEP data file To use the GAMBIT cleanup tools to identify and eliminate short edges and small faces that can adversely affect meshing To mesh the model using unstructured, tetrahedral mesh elements the quality of which is controlled by means of size functions This tutorial, in conjunction with Tutorial 12, also illustrates the differences between geo- metry import by means of STEP data files and direct CAD geometry import. Specifically, Tutorial 12 employs a model identical to that shown above but imports the data directly, as a “part” file, from the CAD program that was used to create the drill-bit geometry. (NOTE

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This note was uploaded on 01/13/2011 for the course MECHANICAL ME:5208 taught by Professor P.k.lele during the Spring '10 term at Jadavpur University.

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tg11 - INDUSTRIAL DRILL BITSTEP GEOMETRY 11. INDUSTRIAL...

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