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About velocity angle when plotting a contours

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Old   July 24, 2010, 23:24
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Hi,folks! I gotta a kind of stupid easy question that has been confusing me for a while, could anyone help me out?

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?

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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File Type: bmp Sketch map of velocity angle in author's opinion.bmp (32.6 KB, 9 views)
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contours, degree, physical meaning, radian, velocity angle

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