k-epsilon model: which criteria do I have to meet for the near wall mesh?

- April 30, 2020 at 12:14 pm
  
  Walburga Kerschbaumer
  Subscriber
  
  Hello,
  
  which criteria for the near wall mesh do I have to meet when using the k-epsilon model? I set up a simulation of an exhaust manifold (hot gas flow).
- April 30, 2020 at 12:24 pm
  
  DrAmine
  Ansys Employee
  
  Do not use Epsilon based turbulence model. Use the industry standard SST model which has an insensitive wall treatment. Ideally (that is the ideal) you require 10-15 inflation layers and yplus around 1. However this also depends on the Pr number: for high Pr numbers the yplus requirement scales as the root of Pr.
- April 30, 2020 at 12:28 pm
  
  Walburga Kerschbaumer
  Subscriber
  
  Hello,
  
  which criteria for the near wall mesh do I have to meet when using the k-epsilon model? I set up a simulation of an exhaust manifold (hot gas flow).
- April 30, 2020 at 12:30 pm
  
  Walburga Kerschbaumer
  Subscriber
  
  Ok. Thank you very much for the information and answering so fast.
- May 12, 2020 at 10:34 pm
  
  mutlaq404
  Subscriber
  
  Do not use Epsilon based turbulence model. Use the industry standard SST model which has an insensitive wall treatment. Ideally (that is the ideal) you require 10-15 inflation layers and yplus around 1. However this also depends on the Pr number: for high Pr numbers the yplus requirement scales as the root of Pr.
  
  Hello,
  
  can you answer me, please?
  
  the value of y+ appears in the fluent very very small like 0.41 or 0.174 Do not exceed 10 how i can fixed this?