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Step 3: Mesh

 You should have completed the Laminar Pipe Flow tutorial before continuing with this one. The starting point for this tutorial is the ending point of the one before it.  If you bring up the project we have already completed, you can follow the next steps.

Right click on Mesh.  Then click on Duplicate, which will duplicate the mesh from the previous tutorial.  We need to change the edge sizing, as we did in the previous tutorial, to 100 by 30 (instead of 100 by 5).  We are also going to need to bias it.  This is because we want smaller divisions the closer you get to the wall.  To do this, we will change the bias factor to 10, and the bias type to one that goes from smaller on the top to bigger on the bottom.  You want to make sure that the bias is the same on each side, and not opposite ways (which is what the program will do by default).  We are able to do this by changing the bias one edge at a time.  Be sure that the biased types are the same for both sides, and then click Update. A mesh will be generated.

Recall that we created the following boundary types for the 100x5 mesh in the Laminar Pipe Flow tutorial:

These boundary types are still retained even if the edges are remeshed since the edges themselves were not deleted. To verify this:

Operation Toolpad > Zones Command Button Image Removed
> Specify Boundary Types Image Removed

Check that the following is in the Name/Type list:

Image Removed

Additionally, click on show labels. You should now be able to see each of the boundary names on the respective edges in the Graphics Window. Verify that the boundary types specification is correct.

Save and Export

As in the previous tutorial, we will now save and export the mesh.

Main Menu > File > Save

Main Menu > File > Export > Mesh...

Type in pipe100x30.msh for the File Name:. Select Export 2d Mesh since this is a two-dimensional mesh. Click Accept.

Check that pipe100x30.msh has been created in your working directory.

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Go to Step 4: Setup (Physics)

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