A velocity field in polar coordinates is given with the radial velocity as \(V_{r}=-A / r\) and the tangential velocity as \(V_{\theta}=A / r\), where \(r\) is in meters and \(A=10 \mathrm{~m}^{2}\). Plot the streamlines passing through the location \(\theta=0\) for \(r=1 \mathrm{~m}, 2 \mathrm{~m}\), and \(3 \mathrm{~m}\). What does the flow field model?