The numbering of the Point, Circle, Line Loop and Plane Surface features don’t need to be changed. geo file and everything should be parametrized accordingly as shown below:Īs we see, the coordinates are the only ones that need to be substituted with the new parameters. Parametrization of location of center of the circle and creation of a menu to control it along with the radius dimensions in meters dat file we will parametrize the location of the center of the circle and we will create an input function to read from the GUI the location in rectangular coordinates and the radius or the circle. dat file to generate a personalized menu on the GUI. Script generated in Gmsh’s syntax Parametrizing your geometryįor simple geometries the GUI is quite user friendly and the syntax is sequential and easy to understand, but what if we want to model and compare circles of different radii, or what if we want have more complex geometries? In this case can use a text editor to create a. At the end of the menu tree you will find a feature called Edit Script, when we click on it we a text editor pops up with the script that describes the geometry you have just created. This last step finalizes the creation of a circle using Gmsh’s GUI. In our case we have a solid surface, so we can press ‘e’ to end the selection. First we need to select the surrounding boundary, and then if any, the boundaries of the holes within the surface. The Plane surface feature enables you to create solid surfaces or with holes. Since the face of our geometry is flat, we can use the Plane Surface feature to define the circle. Once we have connected all the dots, we have identified the circumference of the circle, hence, only its boundary line. Note that Line 1 connects Point 2 and Point 3 with center in Point 1, Line 2 connects Point 3 and 4 with center in Point 1, and so on. To generate a circle you will need to connect the points created using the Circle arc feature in the tree, first choosing the starting point, the center of the circular arc and the end point as shown below. By selecting Point a new window pops up, enabling you to select the rectangular coordinates where the points will be located. In the image below we show how to expand the Geometry tree and create points within the interface. A circle is a 2D geometrical entity and we will need to define three characteristics: the points that define our plane (at least three), the lines that connect our points and the surface itself. There is a consistent workflow in the generation of geometries in Gmsh. ![]() For this reason I will compare the workflow shown on the GUI to the text file generated, for you to see their similarities. I personally like using a combination of both: GUI and text editor in parallel, as some things are done quicker one way rather than the other. This will ramp up the learning curve and allows you to learn Gmsh’s syntax. ![]() ![]() Generally, it is appropriate to start working with the GUI at the beginning, if you have never used Gmsh before. The latter one will be quite useful for more complex or parametrized geometries, and we’ll touch on it at the end of this post. There are two ways of constructing geometries using Gmsh: using the Graphical User Interface (GUI) or simply by creating a text file (.geo) in a text editor, using Gmsh’s syntax. This post addresses the very basics of geometry generation using a circle as an example. The creation of geometries using Gmsh can be tricky at times.
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