(Solved) Turbulence model and Y+ value
Hello expert,
I am new to CFD and i have some questions about turbulence model and Y+ value.
- There is a lot of turbulence model provided in AcuSolve: Spallart Allmaras, K-epsilon, K-omega,...
- So which model should be used for some specified case?
- The value Y+ is used to determined the 'first cell height' while meshing.
- what is the value of Y+ should i used to calculate 'first cell height'?
- Does it depend on type of flow (internal/ external) or chosen turbulence model?
the following picture was taken in HyperMesh > Utility browser.
Thank in advance!
Best regard!
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Altair EmployeeYou'll achieve better accuracy with lower Y+ values - at the cost of more mesh and longer simulation runtime. For example, you'll typically get a more accurate solution with Y+ = 20 than you would with Y+ = 100. However, maybe the level of accuracy at Y+ = 100 is enough for your purposes. That's where it becomes 'engineering' instead of just running a simulation. You can run a mesh sensitivity study to see how the solution of interest changes as you modify the meshing parameters.
Hi,
The y+ value depends upon the accuracy of solution required in the near wall region for your simulation and also the turbulence model chosen. Spalart-Allmaras, the standard acusolve wall function, can handle y+ values below 300.