Till now we've discussed the pre-requisites to build structures in COMSOL. Today we will explore some of the base structures like circle, rectangle, square, polygon, etc. This will lead us to build complex models in the future.
Geometry Console:
Right-click on the geometry node and you will find 10 structures as;
* Circle
* Ellipse
* Rectangle
* Square
* Polygon
* Point
* Parametric Curve
* Line Segment
* Interpolation Curve
* Bezier Polygon
To build the specific structure, you just need to select the structure and the related settings will be available in the Settings window.
Geometry Settings:
No matter what geometry you choose, there'll be mostly similar segments in the settings window.
The flowchart briefly explains the functions of the geometry settings. But for some structures, there are some more options available. Let us talk about them separately.
Special Fields:
✦ Sector Angle (Circle): One can modify the share of the circle by inserting the angle value here. For example, 360° for a full circle, 180° for half circle, 90° for quarter circle, etc.
✦ Coordinates (Polygon): Takes the coordinates of the polygon.
✦ Expression (Parametric Curve): As the name suggests, parameter refers to another variable (let 's') rather than actual variables (let x,y) in a problem. And the actual variables are expressed through that parameter by some equations. Therefore 's' requires a minimum and maximum value and the expressions for the actual variable. For example,
x= 0.5*s+2*s^2 andy= 5*s-3*s^2 where -1≤ s ≤1
✦ Start & End Point (Line Segment): It calls for the selection of the start and endpoint of the line. One can manually enter the coordinates of the line by choosing coordinates in the specify dialogue box.
✦ Data Source (Interpolation Curve): Similarly like the coordinates in Polygon, the same options are provided here for data entry (Vector, File, Table). One just needs to specify the data here.
Don't forget to watch the video on building project in COMSOL: Geometry in COMSOL Multiphysics
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