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A Common Problem when Meshing Cylinders



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A common problem that users run into when creating an unstructured mesh on a cylinder can be seen in the figure below.

Example of an unstructured mesh on a cylinder

You can see 3 domains in this case. There are two half cylinder unstructured domains (shown in purple). These are associated with two half cylinder database surfaces. The problem is with the endcap domain (shown in green). The two semicircular connectors that bound the green endcap domain are associated with the two half cylinder database surfaces. Because of that Pointwise thinks that the interior points on the green domains should lie on the two half cylinder database surfaces. The end result is all the interior points for the green domain are pushed out to its boundaries (to points that actually lie on the database surfaces).

To fix this problem, you need to make the domain “free” in space instead of “database associated”.

  1. Select the green domain.
  2. Grid, Solve
  3. In the Attributes tab, check the Surface Shape frame.
  4. Set Shape to Free.
  5. In the Solve tab, click Initialize.
  6. OK

The new domain is no longer database constrained and should look like the one seen below.

Example of an unstructured mesh on a cylinder

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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.

  • Send a question using the Get Help form.
  • Call our support engineers toll free at 800-4PTWISE.
  • Email our support engineers at support@pointwise.com.