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LeFerret
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Homework Statement
Determine the Strain Rate for a Material Fiber in the direction of the surface normal.
The Velocity Field is
V=((4y-3x)i+(5x+3y)j) ft/s
http://puu.sh/9hQ7Q/2bda80620f.jpg is the picture
which describes a steady, planar flow
where i and j are unit vectors.
Homework Equations
n * (n * ∇) V
where n is the unit normal, and * are dot products.
The Attempt at a Solution
I know that the solution to this itself is very simple, it is just math, my biggest issue though is how do I find the unit normal vector? I have no idea where to begin, any hints would be greatly appreciated!
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