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Problem Specification |
8. Postprocess the results
9. Validate the results
Step 4: Specify geometry
Because of the inherent symmetry of the model, we'll perform the analysis on a quarter of the volumes only. Recall that a=0 (i.e. angle between the planes in which radii R1 and R2 lie is zero). As a result, the upper and lower volume have the same orientation, when viewed from the top.
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We will define the origin of the coordinate system to be at the point of contact.
Create Keypoints
Main Menu > Preprocessor > Modeling > Create > Keypoints > In Active CS
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Keypoint 10: X =0, Y =R1-inter, Z =0, Click OK.
Create Lines
Main Menu > Preprocessor > Modeling > Create > Lines > Lines >In Active Coord
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At this point we have all the lines and arcs needed to create the areas.
Create Areas
Main Menu > Preprocessor >Modeling > Create > Areas > Arbitrary > By Lines
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Note that you can also generate the areas by creating two squares and two circular sectors, and then adding them using boolean operations. This method generates the same end result. |
Create Volumes
To create the volumes, we will rotate each of the areas about a line/axis.
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If you did this correctly, you will see that both areas are rotated 90 degrees in the negative z direction. Note that the key step here is to specify a rotation angle consistent with your selection of initial and final keypoints, following the right hand rule.
Save Your Work
Toolbar > SAVE_DB
Go to Step 5: Mesh geometry