TY - GEN
T1 - Further development of the amplification factor transport transition model for aerodynamic flows
AU - Coder, James G.
N1 - Funding Information:
This research was partially funded by the Government under Agreement No. W911W6-17-2-0003. The U.S. Government is authorized to reproduce and distribute reprints for Government purposes notwithstanding any copyright notation thereon. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the Aviation Development Directorate or the U.S Government. This research was also partially funded by the National Aeronautics and Space Administration (NASA) University Leadership Initiative (ULI) “Advanced Aerodynamic Design Center for Ultra-Efficient Commercial Vehicles” (Award NNX17AJ95A). Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of NASA.
Publisher Copyright:
© 2019, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.
PY - 2019
Y1 - 2019
N2 - A laminar-turbulent transition modeling framework is presented that is fully compatible with modern computational fluid dynamics solvers. The model is based on the approximate envelope method of linear stability theory, and uses a transport equation describing the evolution of the envelope amplification factor for streamwise instabilities. The amplification factor transport equation is coupled with an intermittency model for robust treatment of the laminar and turbulent regimes. These are coupled with a widely used, one-equation eddy-viscosity model, yielding a three-equation transition/turbulence closure strategy for the Reynolds-averaged Navier-Stokes equations. The model is applied to a variety of test cases, including a flat plate, natural-laminar-flow airfoils, and three-dimensional geometries. Several grid convergence and free-stream sensitivity studies are included to demonstrate the model’s robustness. In comparisons with experimental data, the transittion model was found to significantly improve over fully turbulent predictions both for integrated and distributed loads. The model does, however, lack a deliberate treatment of crossflow instability mechanisms, which is the subject of ongoing research.
AB - A laminar-turbulent transition modeling framework is presented that is fully compatible with modern computational fluid dynamics solvers. The model is based on the approximate envelope method of linear stability theory, and uses a transport equation describing the evolution of the envelope amplification factor for streamwise instabilities. The amplification factor transport equation is coupled with an intermittency model for robust treatment of the laminar and turbulent regimes. These are coupled with a widely used, one-equation eddy-viscosity model, yielding a three-equation transition/turbulence closure strategy for the Reynolds-averaged Navier-Stokes equations. The model is applied to a variety of test cases, including a flat plate, natural-laminar-flow airfoils, and three-dimensional geometries. Several grid convergence and free-stream sensitivity studies are included to demonstrate the model’s robustness. In comparisons with experimental data, the transittion model was found to significantly improve over fully turbulent predictions both for integrated and distributed loads. The model does, however, lack a deliberate treatment of crossflow instability mechanisms, which is the subject of ongoing research.
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U2 - 10.2514/6.2019-0039
DO - 10.2514/6.2019-0039
M3 - Conference contribution
AN - SCOPUS:85083943615
SN - 9781624105784
T3 - AIAA Scitech 2019 Forum
BT - AIAA Scitech 2019 Forum
PB - American Institute of Aeronautics and Astronautics Inc, AIAA
T2 - AIAA Scitech Forum, 2019
Y2 - 7 January 2019 through 11 January 2019
ER -