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1.3. Creating Simple Meshes
Additionally, these mesh boundaries must be closed and the following points must be coincident:
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IMin=1 and JMin=1.
IMin=max and JMax=1.
IMax=max and JMax=max.
IMax=1 and JMin=max.
Under these requirements IMin and IMax must increase in the same direction, and JMin and
JMax must increase in the same direction.
Note: When mesh boundaries are created from multiple boundary lines, adjacent lines must
have coincident mesh points (nodes). One of these nodes will be automatically removed after
the boundary is assembled.
1.3.2.1. Creating the JMin Boundary. To create the JMin boundary, perform the following steps:
1.
Click on the Boundary menu, then select the Create Circular Arc option. This will call up
the Circular Arc dialog, shown in Figure 1-2. The first option in the Line Definition area of
the dialog is Specify. Here, there are options: Center, Starting Point, Arc Angle; and Starting, Ending Point, Radius. Click on the latter.
2.
In the Arc area of the dialog, enter 0 for X and 0 for Y in the Start text fields, and 1 for X
and 1 for Y in the End text fields. Accept the remaining default values. Use the Line Label
text field to name this boundary line “b1” and click on Create. The arc will be created in the
current Tecplot frame. Close the Circular Arc dialog.
3.
Now we will add a polyline to the JMin boundary. Call up the Polyline dialog by selecting
the Create Polyline option from the Boundary menu. The Polyline dialog is shown in Figure 1-3.
4.
On the left of this dialog is a list titled Control Points. When you are first defining a new
polyline boundary, this list will be empty. To the right of the Control Points list are two text
fields labeled X and Y. There are three ways to enter the control point values for your
polyline: by using Tecplot’s Selector tool in conjunction with the Select Endpt. button on
the Polyline dialog, by entering the values manually into the text fields, and by converting a
Tecplot geometry. For this polyline we will use the first and second.
5.
With the Tecplot Selector tool click on b1 near one of its nodes closet to its end point of 1,
1. On the Polyline dialog, click Select Endpt. This inserts b1’s end points into the X and Y
text fields. Click on Insert Before to enter the point into the list. Now enter 5 for X and 1 for
Y in the text fields. Click Insert After.
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