### 11.4.3. Transient Rotor-Stator

The Transient Rotor-Stator model takes into account all of the transient flow characteristics. A sliding interface is used to allow a smooth rotation between components. As with the Frozen Rotor model, the Transient Rotor-Stator model scales the flow from one component to the next in order to account for a non-unity net pitch ratio. This model is robust and yields high accuracy predictions of loading. The drawbacks include high computational cost and large amounts of storage required to hold the transient data.

Note: The dynamic re-intersection of the interface at the start of each time step may result in a different interface topology, which in turn may require more or less memory. Unlike the static interfaces (Frozen Rotor, Stage), which are only intersected once (first time step of a serial run or partitioner in a parallel run), the initial memory estimate might not be sufficient for the whole run. To avoid potential memory problems, it might be necessary to start the simulation with more conservative (larger) memory factors.

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