Numerical simulation of a normal jet in crossflow has been performed using a recently developed hybrid RANS-LES model. The model form utilizes a solution based parameter that dynamically determines the RANS and LES regions. Numerical simulations using commercially available DDES model and a RANS model have also been performed for comparison purposes. Three jet to crossflow velocity ratios (R = 2, 1, 0.5) have been investigated. Computational results obtained are compared with the experiment of Andreopoulos and Rodi (1984). The results highlight the predictive capabilities of hybrid RANS-LES model to reproduce the important vortical structures of a jet in crossflow case, which play a crucial role in the film cooling. The hybrid RANS-LES model results from the velocity ratio R = 2 case fare well with the experiment in comparison to RANS predictions. For lower velocity ratios, discrepancies in mean flow statistics have been observed at some measurement stations. The near wall statistics from the hybrid model resembles RANS predictions for the case with jet to crossflow velocity ratio R = 0.5. This observation can be attributed to the requirement of higher grid resolution necessary to capture the near wall structures for low velocity ratio cases.
- Fluids Engineering Division
Hybrid RANS-LES Modeling of a Normal Jet in Crossflow for Film Cooling Applications
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Dhakal, TP, & Walters, DK. "Hybrid RANS-LES Modeling of a Normal Jet in Crossflow for Film Cooling Applications." Proceedings of the ASME 2013 Fluids Engineering Division Summer Meeting. Volume 1A, Symposia: Advances in Fluids Engineering Education; Advances in Numerical Modeling for Turbomachinery Flow Optimization; Applications in CFD; Bio-Inspired Fluid Mechanics; CFD Verification and Validation; Development and Applications of Immersed Boundary Methods; DNS, LES, and Hybrid RANS/LES Methods. Incline Village, Nevada, USA. July 7–11, 2013. V01AT09A007. ASME. https://doi.org/10.1115/FEDSM2013-16551
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