Often you have such a need to generate an additional subdomain on previously prepared geometry. For example, you want to allocate a certain space to change it from a gas domain to a solid domain.
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| How to add subdomain on existing geometry |
In the first step you have to draw a 2D sketch. On the existing geometry, you select the surface (1) on which you will draw the sketch to be 3D extruded. Then you click on the Sketching tab (2) where you can draw any shape. In our case, it will be two circles. Right-click on the geometry and choose the Look At (3) option. Then your model will move to the working position - you will have a perpendicular view to the surface you marked earlier.
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| How to sketch on the existing geometry - Design Modeler Ansys |
When generating an additional subdomain, we will get rid of unnecessary faces from the model so that our mesh is not complicated. For this purpose, we will use the Box Select option.
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| Unecessary faces on the model - Design Modeler Ansys |
In the first step of removing faces, we need to hide some geometry planes to make it easier for us to select the zone that we do not want in the 3D model. We use the function Hide Faces to hide two planes (1, 2). Then select the Box Select option (blue frame) and mark the entire zone of unwanted faces.
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| Box Select option - Design Modeler in Ansys |
After selecting faces, select the Face Delete function (red frame). After approving the option, click Generate and now, our model has been simplified, we got rid of unwanted faces.
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| Face Delete option in Design Modeler Ansys |
Now we can compare our model before simplification (left) and after using the Face Delete function (solid on the right).
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| Simplification of the model in Design Modeler - Ansys Face Delete Option |
Now we can go back to generating our subdomain. We enter the Sketching tab and draw two circles (red frame) as shown in the drawing below. Then, to give dimensions to our circles, click the Dimensions function (blue frame). Select the Diameter option and select the circles one by one. You can see that there is a D3 and D4 marker next to each of them. Then we can define the sizes of our circles by value (orange frame).
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| How to define diameter of circle in Design Modeler Ansys |
Then, to separate the subdomain from the model, select the Extrude function (red frame). In the Operation option, we select Slice Material (blue frame), we define the extrude depth (orange frame) and what geometry zones the Extrude operation will apply (green frame). After completing all the steps, click Generate. And we already have a separate subdomain in the model.
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| Slice Material Option in Ansys Design Modeler |
We can also get rid of the generated subdomain by using the Supress function. This option is useful if you want to create simplified obstacles in the model, e.g. for gas flow analysis.
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| Supress function in Ansys Design Modeler |
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