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Normal Extrusion from Edges

When you select multiple connectors for an extrusion, you have a couple of options for how the resulting extrusion will look. Much of it depends on how you define your initial edge for the extrusion.

For our first example, let us look at creating an extrusion from two connectors. If you select the two connectors and enter the extrusion command, Pointwise's default behavior will be to assemble those connectors into as few edges as possible. In this case, two connectors will be assembled into one edge.

For an extrusion, one edge will equal one domain.

Both of our connectors have been dimensioned to 10. It is important to note that you cannot extrude from an undimensioned connector.

  1. Select the two connectors.
  2. Create, Extrude, Normal
  3. Click on Done
  4. Click on the Boundary Conditions tab.
  5. Select all connector end nodes and set Type to Symmetry X.
  6. Set Boundary Condition.
  7. Go to the Run tab.
  8. Enter 40 for Steps.
  9. Run

As you can see, even though you had two connectors, because they were formed into one edge, one domain resulted from the extrusion.

Now, what happens if you want to extrude each connector into a domain? In the Extrusion window, you will need to specify each connector as its own edge. Let us see how.

We will start with the same two connectors as used in the first example.

  1. Select the two connectors.
  2. Create, Extrude, Normal
  3. Check the Assemble Special frame.
  4. Delete All Edges
  5. In the Assemble frame, select One Edge per Connector.
  6. Assemble
  7. Done
  8. Click on the Boundary Conditions tab.
  9. Select all connector end nodes and set Type to Symmetry X.
  10. Set Boundary Condition
  11. Go to the Run tab.
  12. Enter 40 for Steps.
  13. Run

As you can see, two domains resulted from the extrusion - one from each connector. This is because we specified each connector to be a different edge.

Let us look at one last example. What if you have multiple connectors and you want to have a mixture of domains? In this case, you will have to manually create edges. You can tell Pointwise which connectors you want to combine into a single edge and which connectors you want to specify as their own edges.

We will start with 3 connectors - each dimensioned to 10. We will obtain 2 domains out of these 3 connectors.

  1. Select the three connectors.
  2. Create, Extrude, Normal
  3. Check the Assemble Special frame.
  4. Delete All Edges
  5. Select con-1 and con-2.
  6. Save Edge
  7. Selectcon-3.
  8. Save Edge
  9. Done
  10. Click on the Boundary Conditions tab.
  11. Select all connector end nodes and set Type to Symmetry X.
  12. Set Boundary Condition
  13. Go to the Run tab.
  14. Enter 40 for Steps.
  15. Run

As you can see, even though we had three connectors, two domains resulted from the extrusion. This is because of the way we manually specified edges from the three connectors - we specified the first two connectors as a single edge and the third connector as its own edge.


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If you have questions about the steps outlined above or on any other meshing topic, please contact us via one of the following methods.

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