Like selecting the geometric features, you can also select nodes and elements after the mesh creation in ANSYS® Mechanical. It is a very useful thing if you create a very specific mesh structure and attaching boundary conditions upon these mesh elements and nodes. You can see the explanation of how to select nodes and elements in ANSYS® Mechanical.
Nodes are the intersection points between mesh elements that are created to solve FEA problems. If you select the selection option that is shown by the red arrow above, you can select the nodes by clicking with your mouse on the graphics window in ANSYS® Mechanical.
With the other selection option as shown by the green arrow in ANSYS® Mechanical, you can select the mesh elements individually. You can also assign your boundary conditions on these elements in ANSYS® Mechanical.
As you see above in the green box, some of the mesh elements are selected by clicking with the mouse on them in ANSYS® Mechanical.
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If you want to do multiple selections like the above examples, you can press on Shift Key+Mouse Click to select multiple elements in ANSYS®.
As you see above, it is very easy to work with mesh nodes and mesh elements in ANSYS® Mechanical.
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NOTE: All the screenshots and images are used for educational and informative purposes. Images used courtesy of ANSYS, Inc.