Extensions to the Gamma-ReTheta model

The Waviness Model

Models for the transition from attached bubble to open separation (Unsteady calibration of the Gamma ReTheta Transition Model)

Model

The consideration of unsteady effects means that the time-interaction of an upstream wake with a downstream leading Edge und the following suction side is represented at sufficient accuracy. Wake-sensitive results have been measured at the UniBw. Due to the design they show on the suction side the transformation from an still at the profile closed huge bubble to an open separation. This follows if the number of wakes and the circumferential wake speed is reduced. It is well known that standard RANS is not able to predict this very sensitive reattachment process. But with the help of an sophisticed unsteady wake detector it was possible to calibrate the reattachment function of the Gamma ReTheta transition model in a way reproducing the results. With "-svtm" the Slip Velocity Transition Model is active for the unsteady calculation with ZONAL-Interface.

Steady reattachment model for the Mixing Plane Interface

During the development of the unsteady model it was also possible to reproduce the measured results by making the constant in the reattachment function dependent on the Strouhal-Number and for a small part on the Thoughflow-Number. With "-svtm" the Strouhal-Number dependency is active for the steady calculation with MIXING-PLANE-Interface.

Note: Review documents are available on MTU's intranet.