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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.
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The overall boundary is shown below.
Where ABCDE is the farfield boundary and FE is the wedge.
Start GAMBIT
Create a new directory called wedge and start GAMBIT from that directory by typing gambit -id wedge at the command prompt.
Under Main Menu, select Solver > FLUENT 5/6 since the mesh to be created is to be used in FLUENT 6.0.
Create Vertices
The coordinates needed for the mesh are shown below
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Operation Toolpad > Geometry Command Button *> Vertex Command Button* *> Create Vertex * Vertex
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.
Operation Toolpad > Geometry Command Button *> Edge Command Button * Button*> Create Edge*
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.
Operation Toolpad > Geometry Command Button *> Face Command Button* *> Form Face*
This brings up the Create Face From Wireframe menu. Recall that we had selected vertices in order to create edges. Similarly, we will select edges in order to form a face.
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 GAMBITGeometry