### 11.5.4. Case 3: Blade Passage at or Close to the Edge of a Domain

Figure 11.5: Radial Compressor shows a blade that extends to the edge of the rotating domain. Although it is convenient to place a domain interface at the blade edge (1), this can result in unrealistic results (The area of the interface would be reduced on one side where the interface is displaced by the blade edge, resulting in an inaccurate pitch change calculation. Also, in the case of a stage interface, the wake would be mixed out at the trailing edge.) A better arrangement is to extend the rotating domain away from the blade edge. Domain Interfaces can then be created at (2), (3), and (4).

Figure 11.5: Radial Compressor

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