Semi Structured Mesh Type
The semi structured face mesh type is used to transition mapped mesh along one direction while keeping mapped mesh along the other direction.
As such, for the default transition mesh type, the two edges along the transition path should have the same edge sizing and the other two edges should have a transitional size that is of the form: edge1 = edge2 +/- 2*n where n is the number of transitions. In the example below:
Edge divisions for A and B should be equal and Edge divisions for 2 would be equal to the number of divisions for 1 +2*2 transitions. Edge 1 has 5 divisions and Edge 2 has 9 divisions as there are two transitional regions.
Corners are handled during meshing, as shown in the example:
Mesh orientation is also controlled by the sizing specified. For example, here the sizing specifies 10 divisions for the top two edges combined and 10 divisions on the edge at bottom, 5 on left and 3 on right (1 transition)
For the same example, specifying 4 divisions on the right edge would result in a mesh as shown:
Adjusting the sizing, for example, 11 divisions on the right edge will result in the mesh converted to semi-structured (5 divisions on the left + 3 transitions * 2 = 11 divisions on the right).
Selecting the Semi Structured Type
Select one of the options to set the semi structured mesh type:
Transition  |
(Default) Transitions mapped mesh such that the two edges along the transition path have the same edge sizing and the other two edges should have a transitional size that is of the form: edge1 = edge2 +/- 2*n where, n is the number of transitions. 
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Circle  |
Creates an O-Grid for the free face of a swept block, or 2D or 3D free block. 
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Half Circle  |
Creates a C-Grid for the free face of a swept block, or 2D or 3D free block. 
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Quarter Circle  |
Creates an L-Grid for the free face of a swept block, or 2D or 3D free block.  |