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Analytic equation of elliptic-like figure

  1. Nov 26, 2009 #1
    I have to implement the following figure in a programme I am writing but I actually don’t know if there exists an analytical equation describing it. Before I had my problem propagation like a rectangular box, but this might give a better approximation. For your information I am writing a programme to describe fracture propagations in oil reservoirs at work. Do some of you guys know if it can be obtained and if yes - what it is? If no, why not? Generally assume that radius R1, R2, R3 and R4 are all different from each other. I was thinking about separating it into four sub problems and use the fact that I am looking for a function that has to be perpendicular to each radius, but I don’t want to spend a lot of time on this if there is a generally known formula.

    Thx,
    Peter.

    PS: Note that the outer elliptical line is wrong but just there to illustrate the problem!
     

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  2. jcsd
  3. Nov 27, 2009 #2

    LCKurtz

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    You could use piecewise sections of ellipses. That would at least satisfy your perpendicularity condition. Here's an example:
    nonoval.jpg
     
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