1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Radial and tangential velocities for Inviscid flow (fluid mechanics)

  1. Apr 14, 2014 #1
    After I have an expression for the stream-function in a problem, I can differentiate to get the tangential and radial velocities because I need those to solve the problem. But I don't understand when the tangential velocity will be 0 and when the radial is 0. Can some on explain?
  2. jcsd
  3. Apr 14, 2014 #2
    Is this for flow past a cylinder or past a sphere?

  4. Apr 15, 2014 #3
    I didn't realize there was a difference but cylinders for this question.
  5. Apr 15, 2014 #4
    If you're referring to the radial and tangential velocity components at the surface of the cylinder, then the radial component has to be zero, since you can't have flow through the solid surface of the cylinder. For inviscid flow, the tangential component of the velocity does not have to be zero at a solid surface. The leading edge and the trailing edge of the cylinder are both stagnation points, so both components of velocity are zero at these points.

  6. Apr 15, 2014 #5
    Thanks for clearing this up.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook