### 11.5.3. Case 2: Step Change Between Rotor and Stator

For the case shown, there is a step change in the passage height between the rotor and stator. A common choice for placement of the interface would be choice 1. However, take care with this setup because the non-overlap regions of the interface should be specified as walls. A better alternative may be to use a domain interface upstream or downstream of the step change, at position 2 or position 3.

Figure 11.4: Possible Domain Interface Positions with Step Change in Passage Height

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