1. The problem statement, all variables and given/known data Using Kelvin’s circulation theorem, find the qualitative and quantitative relation between the circulation around an airfoil and the circulation of the starting vortex. 2. Relevant equations Kelvin's circulation theorem: DΓ/Dt=0 3. The attempt at a solution I don't really know where to begin because I'm not given any information to work with. I don't even know what kind of airfoil or any flow conditions.