Turbulence model

- January 18, 2024 at 11:04 am
  
  Federico Cavalli
  Subscriber
  
  hello,
  I am fairly new to fluent, so I was simulating the aerodynamics of a car to find out the drag coefficient. I cannot figure out which is the best turbulence model. I have a mesh that has 50% of y+ values below 30, and the other half above, for the car walls. I thought about using k-w SST, but it should be used for values of y+ around 1, I think. Can someone enlighten me?
- January 19, 2024 at 4:19 pm
  
  Sunil Lilhare
  Ansys Employee
  
  Hello, for most of the practical applications the default K-Omega SST gives optimum results. For K-Omega SST viscous model the Y plus value should be close to 1 for better accuracy. This can be achieved by reducing the first layer cell height during mesh generation.
  Please have a look at the section of Ansys Fluent User Guide to know more about how to model Turbulence using different viscous models.
  Chapter 14: Modeling Turbulence (ansys.com)