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# fluid dynamics pathlines help watch

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1. i really don't understand how to find path lines!
for the flow:

u = (y-t)i +(x +t)j

evaluate at t=1 that was x=1, y=1, t=0

thank you!!
2. (Original post by DreamsComeTrue.)
i really don't understand how to find path lines!
for the flow:

u = (y-t)i +(x +t)j

evaluate at t=1 that was x=1, y=1, t=0

thank you!!
The position r of a fluid particle satisfies

or

This is just saying that the particle's velocity is given by u.

You also have the initial condition: x=1 and y=1 at t=0.

Go. Solve. Be merry.

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Updated: March 20, 2011
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