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Pre-Analysis & Start-up |
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Step 1: Create Geometry in GAMBIT
This tutorial leads you through the steps for generating a mesh in GAMBIT for a wedge geometry. The generated mesh can then be read into FLUENT for fluid flow simulation.
In an external flow such as that over a wedge, we need to define a farfield boundary and mesh the region between the wedge and the farfield boundary. It is a good idea to place the farfield boundary well away from the wedge to reduce interference with the shock that we want to observe.
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Create the vertices by entering the coordinates under Global and the label under Label:
Click the FIT TO WINDOW button to scale the display so that you can see all the vertices. The resulting image should look like this:
(Click picture for larger image)
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https://confluence.cornell.edu/download/attachments/90739873/step1_img2.jpg?version=2 |
Create Edges
Now we can create the edges using the vertices created.
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Create the edge AB by selecting the vertex A followed by vertex B. Enter AB for Label. Click Apply. GAMBIT will create the edge. You will see a message saying something like "Created edge: AB'' in the Transcript window.
Similarly, create the edges BC, CD, DE, EF, FA and CF. Click on the to select the vertices from the list and move them to the picked list. You can also hold the shift button and mouse click the vertices for selection.The resulting image should look like this.
(Click picture for larger image)
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http://courses.cit.cornell.edu/fluent/step1_img3.jpg |
Create Faces
The edges we have created can be joined together to form faces. We will need to define two faces.
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We will call two faces face1 and face2. To create the face1, select the edges AB, BC, CF, and FA. Enter face1 for the label and click Apply. GAMBIT will tell you that it has "Created face: face1'' in the transcript window.
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We are now ready to mesh the geometry.
Go to Step 2: Mesh Geometry in GAMBIT