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Enter point (0,10,0) in the Coordinates Window and click Apply.
With option Contextual->Join Ctrl-a (mouse menu) click over point 1. A line should be created between (0,10,0) and (0,0,0). Press Escape twice.
With this, a right angle of the square has been defined.
Center the image in the screen with View->Zoom->Frame.
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GiD then asks the user to define the 4 lines that describe the contour of the surface. Select the lines using the cursor on the screen, either by choosing them one by one or selecting them all with a window. Next, press Escape twice.
As can be seen below, the new surface is created and appears as a smaller, magenta -coloured square drawn inside the original four lines.
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Once the surface has been created, the mesh can be created in the same way as was done for the line. From the Top Menu select: Mesh->Generate mesh.
A window appears asking if the previous mesh should be eliminated. Click Yes.
Another window appears which asks for the maximum size of the element, in this example defined as 1.
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This operation is realized by assigning a smaller element size to the point in this zone than for the rest of the mesh. Select the following sequence: Mesh->Unstructured->Assign sizes on points. The following dialog box appears, in which the user can define the size:
Enter 0.1 and click Assign.
Select the upper-right corner point and press Escape. The same window comes up again, click Close.
We must now regenerate the mesh, erasing the mesh generated earlier, and we obtain the following:
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Using this command, the user should first select the 4-sided NURBS surface that will be defined by the mesh and press ESC.
Then a window appears where the number of subdivisions for the surface limit lines should be entered.
Enter 10 and click Assign and select one of the horizontal lines, the parallel line is also selected. Press ESC.
The same window appears again, click Assign and select one of the vertical lines, the parallel one is also selected. Press ESC.
Click Close when the window appears again.
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We want to concentrate the elements in the left zone of the square.
Select both horizontal lines and press ESC. A window appears to enter the weights values.
Both lines should have the same direction so enter a weight of 0.5 to the beginning of the line and click Ok. Press ESC again to leave the function.
If lines have different direction, to obtain the same result, we should assign the weight for one line to the beginning and to the end for the other line.
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