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2. -ReTransition Model • Most empirical models unsuited to unstructured CFD • Use non-local quantities (e.g., streamwise distance, q, etc.) • -Re allows empirical correlations to be used as local quantities • Works with the SST k-w turbulence model • Solves two additional transport equations • Intermittency • Reqt • Developed by Menter and Langtry (of ANSYS) • Allows empirical correlations to be used as local quantities • but critical correlations hitherto unpublished • CD-adapco have reverse-engineered these correlations with assistance from university researchers in Thailand! • Validated for natural, bypass and laminar-separation transition

3. -ReTransition Model Equations Intermittency: unpublished Local transition momentum thickness Reynolds number:

4. Model Calibration Using Ercoftac Data Calibrated Correlations Ercoftac Flat Plate Test Results

5. Practical Application: F1 Rear Wing Laminar separation Transition Turbulent separation Photo courtesy of Renault F1