The Boundary Layer

The reason for the separated flow at the higher Reynolds numbers is the existence of a thin boundary layer of slow moving fluid, close to the body surface, within which viscous forces predominates. Outside this layer the flow behaves almost inviscidly. The drag on the body caused directly by viscosity is quite small but the effect on the flow pattern is profound.

The drag on an aerofoil can be attributed both to pressure and viscous sources and the drag coefficient varies significantly with both angle of attack and Reynolds number.

Renewable Energy 101

Renewable Energy 101

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.

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