Alistair Duff, for technical assistance Mr. Andrew Crockett, for strain gauge assistance
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15. OPTIMIZATION (I)15.1 MODELLINGAs assessed, one of the main contributing factors towards the wing mirrors drag, results from the stagnation of flow on the leading faces; particularly around the area of the mount. In an effort to reduce this source of drag, it was decided to create a small square channel, passing from the leading face of the mount to its trailing face in the flow-wise direction (Figure 15). 
Figure 15 - Optimization (i) This design alteration was performed in Gambit, by deleting the mount volume but not the lower topology (faces, edges and vertices) and creating a face in the shape of the channel on the mount front surface. This face was then subtracted from the mount face and thus a hole was created. This process was then repeated on the opposite side of the mount to produce another hole. Each of the vertices at the corners of the two square holes were then linked to their opposing vertex with an edge, therefore allowing the creation of the internal faces of the channel. With all the necessary faces created, a face stitch command was ordered and the new mount volume was created. The model was then meshed with the same procedure as the original wing mirror geometry and the same boundary conditions were again applied before exporting the mesh for use in Fluent. This new wing mirror design was then run through the same six analyses as the original design so that a comparison between the drag results could be made.
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