Laminar separation bubbles formed on airfoils were expressed numerically using a simple eddy-viscosity turbulence model. The eddy viscosity constant, ε
t, was set to a uniform value inside the turbulent part of the bubble. Overall characteristics of numerical results agreed closely with experimental results. The relation between ε
t and velocity distributions was analyzed by the momentum balance inside the bubble. It was shown that the pressure recovery inside the bubble is proportional to ε
t. Finally, the semi-empirical parameter which determines ε
t was proposed.
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