This paper provides an overview of the models used in transient performance calculations relative to heat exchange between the fluid flows and the material as well as clearance changes due to centifugal forces and thermal loads. It entails a summary of the three basic modeling approaches recorded in literature noting their advantages and disadvantages. The most important criterions for the assesment of these modeling methods for their use in performance calculation programs is derived. The different modeling methods are then assessed with the derived criterions. And finally, further investigations on the most appealing aproach for use in performance calculations are presented.

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