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CFD turbulent fluid, discussion about pressure gradient

  1. Feb 20, 2017 #1
    I simulated an incompressible turbulent flow across a tube. I managed to solve it using OpenFoam and the results seem to be right. However, I noted some vaccum pressure after the sudden expansion but can't figure out why the pressure decreases and then increases again. According to Bernoulli's equation, the pressure should increase as the velocity decrease. Could someone explain me why? Below are some details.

    inlet velocity = 10 m/s
    inlet pressure = 0 (gauge)
    turbulent model used k-epsilon
    kinematic viscosity = 1*10^-5 m2/s
    Here are pressure field and velocity field respectively:

    WhatsApp Image 2017-02-20 at 9.49.26 PM (1).jpeg WhatsApp Image 2017-02-20 at 9.49.26 PM.jpeg
     
  2. jcsd
  3. Feb 26, 2017 #2
    Thanks for the thread! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post? The more details the better.
     
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