- #1
member 428835
Hi PF!
I read that streamlines around a body change according to one's frame of reference. If we consider a sphere that is moving in a flow (low Re) would the streamlines change shape as we change our reference frame from being on the ball verses sitting aside and watching the ball move past us?
I think the two would look basically the same: the streamlines from the ball's frame of reference would look steady and wrap around the ball in an orderly fashion, where the streamlines from a sitting observer's perspective would appear to "move backwards" so as to constantly wrap around the ball.
Any ideas?
Edit: I just found these two images from a paper here: http://webspace.clarkson.edu/projects/crcd/me537/downloads/02_Pastsphere.pdf
The top images are in a moving frame of reference and the bottom two are in a stationary frame (I assume stationary implies as seen from the sphere). Can someone explain these? Perhaps @boneh3ad or @Chestermiller
I read that streamlines around a body change according to one's frame of reference. If we consider a sphere that is moving in a flow (low Re) would the streamlines change shape as we change our reference frame from being on the ball verses sitting aside and watching the ball move past us?
I think the two would look basically the same: the streamlines from the ball's frame of reference would look steady and wrap around the ball in an orderly fashion, where the streamlines from a sitting observer's perspective would appear to "move backwards" so as to constantly wrap around the ball.
Any ideas?
Edit: I just found these two images from a paper here: http://webspace.clarkson.edu/projects/crcd/me537/downloads/02_Pastsphere.pdf
The top images are in a moving frame of reference and the bottom two are in a stationary frame (I assume stationary implies as seen from the sphere). Can someone explain these? Perhaps @boneh3ad or @Chestermiller
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