Understanding the phenomenon of separation and subsequent reattachment of a boundary layer, separation bubble, is of great interest. Indeed, the separation of the boundary layer is one the constraint to increase the efficiency of several aerodynamic devices as an aerofoil or a turbine blade.
In spite of many studies on separated flows, the structure of the separated zone, inside the separation bubble, is not fully understood. Besides, in most of these studies, the surface curvature, for example the aerofoil profile, have an important impact on the separation and reattachment of the flow in addition to the effect of the adverse pressure gradient.
Thus, to isolate the effect of the pressure gradient in the separation of the flow, it would be necessary to be able to simulate a separation bubble induced by an adverse pressure gradient only. For this purpose, we chose to study a separation bubble induced by an adverse pressure gradient on a flat plate.
The main objective of this was to develop an incompressible and irrotational boundary condition that is compatible with the code Incompact3d and the simulation of a turbulent separation bubble.
To achieve this goal, we used an approximation, obtained with the potential flow theory, to develop our boundary condition. Then we did a validation of this boundary condition and a brief study of the resulting separation bubble. In general, good agreement has been obtained between our results and the result of a direct numerical simulation made by Na & Moin (1998).
| Date | 6 Sept 2017 |
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| Original language | French |
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| Awarding Institution | - École de technologie supérieure
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| Supervisor | Louis Dufresne (Supervisor) & Julien Weiss (Co-supervisor) |
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Baudy, K. (Author),
Dufresne (Supervisor) & Weiss (Co-supervisor),
6 Sept 2017Student thesis: Master's thesis › Master in Engineering: Engineering