All fluids are viscous. The viscosity is however not essential to all
kinds of flows. In the following pages, we will study viscous flows.
Close to a solid wall a boundary layer will form. This is due to the
no slip boundary condition. The thickness of the boundary layer will
be dependent on the Reynolds number and of local flow properties.
 Learn more about
boundary layers.
The boundary layer will cause the flow across an obstacle to be
unstable, and the flow will be unsymmetrical. Vortexes will be created
and we have vortex shedding.
Learn more about
vortex shedding.
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