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7.4. Three-Element Airfoil Example with a Modified C-Mesh
2.
For our example the optimization factor is met with a Maximum # Cells value of 40000. On
the Unstructured dialog, set Maximum # Cells to 40000, then click Replace. The Working
dialog will appear while the mesh is regenerated.
Note: On some slower systems this mesh may take up to 30 minutes to generate the optimal
mesh. Increasing Maximum # Cells to 15000 is sufficient to demonstrate how the edit and
replace features work.
7.4. Three-Element Airfoil Example with a Modified CMesh
In the previous example the optimal mesh resulted in thousands of very small triangular cells
clustered around the downstream ends of the extensions to the slat, wing and flap. These cells
are the result of the mesh stretching, which is necessary in the initial mixing layer, but not as
the flow mixes out downstream. Ideally, we want the mesh on the extensions to be less
stretched as we move downstream. This will result in fewer triangular cells in a region where
they are unnecessary. We will accomplish this by using the hyperbolic method in a unique way.
To start the process we need to switch the frame mode to 2D. Then load the airfoil.plt
file again, using Tecplot’s Load Data File(s) option.
7.4.1. Creating the Hyperbolic Meshes
We will create a hyperbolic mesh around each element, in this case, the slat, wing, and flap. We
will then extract the JMin and JMax boundaries from each mesh we have created.
1.
Select Create Hyperbolic Structured from the Mesh menu.
2.
We will be using the zone numbers of the slat as our JMin boundary. You may enter these
values either by typing them in manually, clicking the Add From List buttons, or using the
Tecplot Selector tool in conjunction with the Add Selected buttons. (Add From List will
read Add Selected when using the Selector tool.) You should enter the values in clockwise,
starting at the lower edge of the flap, the beginning of zone 1. The order of all the zones, as
entered clockwise, is 1, 2, 3, and 4.
3.
In the Mesh Control area of the Hyperbolic Structured dialog, set Total Distance to 0.006.
Accept all other default values, then use the Mesh Label text field to name this boundary
“s1.” Click Create. The Working dialog will appear while the mesh is generated.
4.
Now use the Enter Mesh Boundary Zone Numbers text field to enter the zones of the wing
as the JMin boundary. Entered clockwise, these should be 5, 6, 7, 8, 9, and 10.
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