Recent content by jhuleea

  1. J

    What type of flow is represented by these equations?

    Hi, I'm unsure as to what type of flow this is: Stream Function: psi = -ln(r) + theta Potential Function: phi = theta + ln(r) For some reason, I don't think I'm plotting the flow correctly. Suggestions/advice? Thanks!
  2. J

    Fluid Flow: Principal Rates of Deformation/Principal Axes

    Hi all, I've been stumped on this problem for over a month. Any guidance would alleviate my overwhelming frustration. Here is the original problem statement: Find the principal rates of deformation and principal axes for the flow given by: u = (x,y) and v = 0, satisfying the...
  3. J

    Moving Infinite Plate at a Constant Velocity

    AlephZero, THANK YOU! Your explanantion with the example was amazing! I truly appreciate your patience with me, as I realize that my math is a little rusty (since I just started school again recently). Once again, many thanks!
  4. J

    Is This a Modified Laplace's Equation?

    Not really Laplace's Equation?? Hi all! I've been out of school for awhile and so, some of my engineering math is still rusty. While working out a fluids problem, I got stuck on the following PDE: Y''(y)}Z(z)+Y(y)Z''(z)=-1 \frac{Y''(y)}{Y(y)}+\frac{Z''(z)}{Z(z)}=-\frac{1}{Y(y)Z(z)} I know...
  5. J

    Moving Infinite Plate at a Constant Velocity

    I'm sorry, but I'm not familiar with your notation. For the expression for \frac{\partial}{\partial y}, you used \frac{\partial}{\partial \eta}. What function are you taking the partial (with respect to eta)?? Also, for your expression of \frac{\partial^2}{\partial y^2}, are you just...
  6. J

    Moving Infinite Plate at a Constant Velocity

    Why of course! Chain Rule, so elementary yet I didn't even consider it. Thanks! This brings up one more question: For (del^2 eta/del y^2), why is it that the answer is the square of the first derivative of eta instead of the second derivative of eta? That is, (del eta/del y) =...
  7. J

    Moving Infinite Plate at a Constant Velocity

    Hi all! I am required to find the velocity distribution of the flow around an infinite plate that suddenly starts moving with a constant speed U_o. The solution has already been worked out, but I still do not understand all of it. The part that is perplexing to me is where they use the...
  8. J

    Derivation of Continuity Equation in Cylindrical Coordinates

    da_willem, Thank you thank you thank you! After picking over my work for about a week now, I can't believe I oversaw this rudimentary step! Your help is greatly appreciated! =)
  9. J

    Derivation of Continuity Equation in Cylindrical Coordinates

    Help! I am stuck on the following derivation: Use the conservation of mass to derive the corresponding continuity equation in cylindrical coordinates. Please take a look at my work in the following attachments. Thanks! =)
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