The paper presents the flow over an airfoil with different cavity shapes placed on the suction surface of a symmetric airfoil. Unsteady simulations of flow over the airfoil with and without cavities were performed by Reynolds averaged Navier-Stokes (RANS) solver. Lift and drag were checked and the separation point identified at different Reynolds numbers and different angles of attack. The airfoil with cavity produced more drag and less lift as compared to the airfoil without cavity. The cavity with both sharp edges showed better results in terms of lift and drag as compared to other shapes of the cavity.

Abdus Samad

Department of Ocean Engineering

Aswin Vuddagiri

ANGLES OF ATTACK

Cavity

LIFT AND DRAG

Reynolds-Averaged Navier-Stokes

SEPARATION POINTS

Suction surfaces

TRAPPED VORTEX

Unsteady simulations

Angle of attack

Drag

Navier Stokes equations

Reynolds number

Vortex flow

Airfoils

Computer simulation

IDENTIFICATION METHOD

Navier-Stokes equations

Unsteady flow

Vorticity

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IIT Madras

Vortex Trapping by Different Cavities on an Airfoil

Wind Engineering

The paper presents the fluid flow analysis of a symmetric airfoil having circular cavities on its suction surface at three different chordwise locations from leading to trailing edges. The leading edge cavity shapes were distorted using Bezier polynomial so that vortex trapping pattern in the cavities can be captured. Structured meshing scheme via a multi-block strategy was employed. Unsteady simulations were performed by a Reynolds averaged Navier-Stokes (RANS) solver. Lift, drag, pressure and skin friction coefficients were monitored at Reynolds number (Re) = 15 × 104 and 6 × 105 and different angles of attack. Cavity placed at the trailing edge produced better lift to drag ratio as compared to that of the other cavities. The distorted cavities performed badly in terms of lift and drag coefficients. The elliptical cavity shape showed better results at the angles of attack up to 10°. Copyright © 2016 Inderscience Enterprises Ltd.

Progress in Computational Fluid Dynamics

Flow analysis of airfoil having different cavities on its suction surface

Vortex trapping by different cavities on an Airfoil

Advanced Materials Research

Two-Dimensional Large-Eddy Simulation of Flow past a Wind Turbine Airfoil in Deep Fall

Journal	Wind Engineering
Open Access	No