Transient turbulence modeling by Jozsef Nagy

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Revision as of 05:19, 8 January 2020 by Jozsef Nagy (talk | contribs)
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Go back to Day 7.

Transient turbulence modeling (RAS,LES)

transient velocity distribution

Most of the real life problems you would like to tackle include some sort of turbulence. These videos

will give you a detailed explanation on transient turbulence modelling in OpenFOAM. Often you cannot avoid to explicitly depict the transient phenomena in a turbulent flow. For that you have to be able to choose the correct model. Additionally you have to understand the difference between RAS and LES models. In this tutorial you will learn about

  • transient turbulence modelling
  • URANS models
  • Large Eddy Simulations
  • case setup
  • boundary and initial conditions
  • post processing

You can download the blockMeshDict here.

For older versions of OpenFOAM the blockMeshDict file is located in constant/polyMesh, for newer versions the file is located in system.
In newer versions of OpenFOAM the RASProperties dictionary is replaced by turbulenceProperties, however the important entries remain the same.
In newer versions of OpenFOAM the commands yPlus, yPlusLES and/or yPlusRAS are not used. Instead AFTER your simulation run the command pisoFoam -postProcess -func yPlus
In newer versions of OpenFOAM nuSgs was replaced by nut in order to have a consistent syntax. Just rename nuSgs into nut.
In newer versions of OpenFOAM the LES oneEqEddy model was renamed, try kEqn instead.