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Complex potential

  • Thread starter dopey9
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  • #1
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Homework Statement


Iv been given the complex potential equation ..iv been trying to split it into real and imaginary parts so i can find the streamfunction and potential for it...however the ln is making it difficult




Homework Equations





The Attempt at a Solution



iv tried taking out a factor of two from 2i +4 and raising it to the ln part....so i get ln (x+iy)^2...i expanded that but i still got imaginary parts inside

so i was wondering if anyone knows any other ways to split the equation into imaginary parts and real parts

Homework Statement





Homework Equations





The Attempt at a Solution

 

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Answers and Replies

  • #2
Dick
Science Advisor
Homework Helper
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You'll want to express x+iy in the form r*exp(i*theta) and then think about evaluating the log.
 
  • #3
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You'll want to express x+iy in the form r*exp(i*theta) and then think about evaluating the log.
Thanks that makes sense..i got it in my notes but just dont when to apply it
 
  • #4
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streamline question

i was wondering if my u is right, as my problem deals with two dimensional inviscid steady potential flow and there are are various ways to find u = u(r,theta)er + v(r,theta)etheta

u= (-2/r)*er +(2/r)*etheta

and if so i was wondering how to sketch streamlines...using the previous question posted above i found that the speed of the particle was
u= (-2/r)*er +(2/r)*etheta
 
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