### 11.5.5. Case 4: Impeller Leakage

A close-up view of part of Figure 11.5: Radial Compressor, which models flow leaking from a volute back into the impeller region. To model the feature, you can use two domain interfaces (at positions 1 and 2), or a single domain interface downstream of the leak (position 3).

Figure 11.6: Flow Leakage Through Gap Near Impeller Inlet

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