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Conformal Mapping (unit circle => ellipse)

  1. Feb 26, 2008 #1
    I'd like to map the open unit circle to the open ellipse x/A^2 + y/B^2 = 1. How would I go about doing this? I really have no idea how to go about doing these mappings.

    I'm working with the text Complex Var. and Applications by Ward and Churchill which has a table of mappings in the back. The best I can do is to compose different mappings (not sure if this is how these problems are generally attacked).

    From what I can see (and I am probably way off base) I can either map a closed rectangle along and above the x-axis to a half-ellipse, or map a half-annulus (centered at the origin) to a half-ellipse. I'm not sure how I could map the unit circle into either of those two, the box or annulus.

    Thanks in advance, any help is appreciated.

    PS if this is in the wrong section please move it.
  2. jcsd
  3. Jun 30, 2008 #2
    The mapping:
    f(z) = (1/2)(A+B)z + (1/2)(A-B)(1/z)
    will do the trick. This is known as the Joukowsky transformation.
    http://en.wikipedia.org/wiki/Joukowski_transformation" [Broken]
    Last edited by a moderator: May 3, 2017
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