### 11.5.1. General Considerations

- Domain interfaces should typically be placed midway between the rotor and stator for turbomachinery cases.

- To avoid numerical errors, the aspect ratio of elements on the domain interface should be between 0.1:1 and 10:1, as measured by x/y in Figure 11.2: Element Aspect Ratio at Domain Interface.

- Where circular domain interfaces exist, they must be axisymmetric in shape as shown in Figure 11.3: Impeller/Volute.

  Figure 11.2: Element Aspect Ratio at Domain Interface

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