About velocity angle when plotting a contours
Hi,folks! I gotta a kind of stupid easy question that has been confusing me for a while, could anyone help me out?
:confused:Question: What's the physical meaning of "velocity angle" when you want to plot a contours about it on a certain surface?(Please see attched sketch map)
In my own opinion, it is the angle between velocity magnitude and the surface that you have chosen to plot a contours, am I right?
:confused:Plus: the value of the velocity angle is displayed in the unit of radian instead of degree?
Thank you so much for your time and consideration!
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