Aerodynamics: Find Expressions for u and v

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SUMMARY

The discussion focuses on deriving expressions for the velocity components u and v in a given velocity field defined by the absolute velocity |V|=sqrt(x^2+2xy+2y^2) and the streamline equation y^2+2xy = C. The relationship dy/dx = v/u and the equation |v| = sqrt(u^2+v^2) are crucial for solving the problem. Participants emphasize the importance of consistency in applying the square root function for u and the need to maintain the relationship between u and v during differentiation.

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Homework Statement


The absolute value of the velocity and the equation of the streamlines in a velocity field are given, respectively,

|V|=sqrt(x^2+2xy+2y^2) and y^2+2xy = C

Find expressions for u and v.

Homework Equations


dy/dx = v/u
|v| = sqrt(u^2+v^2)

The Attempt at a Solution


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Most of your steps look good. Remember that
##u^2 = f(x,y) ##
implies
##u = \pm \sqrt{f(x,y)}.##
This is important because you need to be consistent and keep ##\frac vu = -1##.
 
Thanks, my only major concern is that when I take the partial derivative, how do I know which term to take derivatives in respect to y or x. Do I have to make assumptions?
 

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