Splitting the Boundaries

Training Guide > Meshing Tutorials > Control Valve Meshing Tutorial > Polyhedral Meshing Example > Splitting the Boundaries

Your Ad Here

Splitting the Boundaries

Next we will prepare the boundaries so that they conform to what is required for the meshing tools. STL surfaces always only contain one patch definition meaning that only one boundary will be created on import for each file. This boundary needs to be split in order for different mesh (and eventually physics) properties can be applied to different parts of the model.

Select the Regions>Region 1>Boundaries>Boundary 1 node.

Right-click and select Split by Angle... from the pop-up menu.

The Split Boundaries by Angle dialog will appear. In this panel, do the following:

Make sure that the Region 1: Boundary 1 boundary is in the Selected box.

Set the Angle (degrees) value to 45.

Press the Apply button to carry out the operation and then Close to close the dialog.

The geometry surface will be subdivided based on the supplied angle resulting in 11 new boundaries being created. These are shown below:

Some of the boundaries will be re-combined in order to simplify the setting up process. First, we will combine all the exterior wall boundaries:

Select the Boundary 1 2 node, press and hold the Ctrl button on the keyboard and then select Boundary 1 4, Boundary 1 5, Boundary 1 6 and Boundary 1 11. As you select each boundary in turn, it will be highlighted in the model display.

Right-click on the Boundary 1 2 node and select Combine from the pop-up menu.

All the selected boundaries will be combined into Boundary 1 2:

Repeat the selection process as previously defined for Boundary 1 7, Boundary 1 8, Boundary 1 9, and Boundary 1 10, which belong to the valve wall.

Once the boundaries are selected, right-click on the Boundary 1 7 node and select Combine from the pop-up menu.

The result of the second combine operation is shown here:

There will be five boundaries remaining at this point. Note that if you selected a different boundary other than Boundary 1 7 to right-click on, then the resultant boundary list will look slightly different. We can now proceed to renaming the boundaries.

Return to CD-adapco STAR-CCM+ Index

Your Ad Here