### 11.6.1. Steady versus Transient Blade Row Analysis

For many turbomachinery problems, steady-state stage simulations involving frame change/mixing models such as Stage or Frozen Rotor, are sufficient to obtain machine performance and analyze flow details. However, when turbomachine component interactions are strong due to close proximity or high speed flow, transient blade row simulation become necessary to improve the prediction of turbomachine aerodynamic performance.

A transient blade row simulation is also needed for aeromechanical (for example, flutter and forced response), aerothermodynamic (for example, hot streak analysis) and aeroacoustics analysis.

In general, a transient blade row analysis is more demanding on computer resources than a steady-state analysis.

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