Implicit Large Eddy Simulation of Transitional Flows Over Airfoils and Wings
The present work aims at predicting the formation of laminar separation bubbles (LSB) and the related transition to turbulence by means of Implicit Large Eddy Simulations with a high-order Discontinuous Galerkin (DG) method. We focus on the ow around an SD7003 rectangular wing section at an ang...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
| Published: |
American Institute of Aeronautics and Astronautics
2010
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| Online Access: | http://hdl.handle.net/1721.1/59429 https://orcid.org/0000-0002-3912-1753 https://orcid.org/0000-0002-8556-685X |
| Summary: | The present work aims at predicting the formation of laminar separation bubbles (LSB)
and the related transition to turbulence by means of Implicit Large Eddy Simulations with a
high-order Discontinuous Galerkin (DG) method. We focus on the
ow around an SD7003
rectangular wing section at an angle of attack of 4o degrees and consider two diffierent
Reynolds numbers of 10,000 and 60,000 in order to gain insight into the characteristics of
the laminar and turbulent regimes. At Reynolds number 10,000 the
ow remains laminar
and essentially two dimensional over the wing surface, and only the wake appears to exhibit
a turbulent behavior. For the case at Reynolds 60,000, the
ow is unsteady over the upper
wing surface and the time averaged streamlines show a separation bubble which starts at
about 24% of the chord. A close to 51% of the chord, the
ow is fully turbulent. These
findings appear to be in agreement with previously published results despite the relatively
coarse meshes employed, which suggest that the DG method used is particularly suited
to simulate these
flows. Finally, transition is found to be caused by unstable Tollmien-
Schlichting (TS) waves, as revealed by the growth of the stream-wise amplification factor. |
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