Difference between revisions of "Transient turbulence modeling by Jozsef Nagy"

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[[category:turbulence]]
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[[category:RAS]]
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[[category:LES]]
 
* '''contributor''': Jozsef Nagy
 
* '''contributor''': Jozsef Nagy
* '''affiliation''': Institute of Polymer Injection Molding and Process Automation, Johannes Kepler University Linz, Austria
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* '''affiliation''': eulerian-solutions e.U., Linz, Austria
* '''contact''': jozsef.nagy@jku.at
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* '''contact''': <mail address='jnmlujnmlu@gmail.com' description='author'>click here for email address</mail>
* '''OpenFOAM version''': 2.3.0
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* '''OpenFOAM version''': v2006
 
* '''Published under''': CC BY-NC-SA license ([https://creativecommons.org/licenses creative commons licenses])
 
* '''Published under''': CC BY-NC-SA license ([https://creativecommons.org/licenses creative commons licenses])
  
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* post processing
 
* post processing
  
You can download the blockMeshDict [https:// github.com/jnmlujnmlu/OpenFOAMTeaching/tree/master/JozsefNagy here].
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You can download the blockMeshDict [https://github.com/jnmlujnmlu/OpenFOAMTeaching/tree/master/JozsefNagy here].
  
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For older versions of OpenFOAM the blockMeshDict file is located in constant/polyMesh, for newer versions the file is located in system.
  
----
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In newer versions of OpenFOAM the RASProperties dictionary is replaced by turbulenceProperties, however the important entries remain the same.
----
 
  
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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''
  
* '''contributor''': Bahram Haddadi, Jozsef Nagy and Christian Jordan
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In newer versions of OpenFOAM nuSgs was replaced by nut in order to have a consistent syntax. Just rename nuSgs into nut.
* '''affiliation''': Forschungsgruppe Thermische Verfahrenstechnik & Fluiddynamische Simulation am Institut für Verfahrenstechnik der Technischen Universität Wien, Austria
 
* '''contact''': <mail address='bahram.haddadi.sisakht@tuwien.ac.at' description='author'>click here for email address</mail>
 
* '''OpenFOAM version''': 2.3.0
 
* '''Published under''': CC BY-NC-SA license ([https://creativecommons.org/licenses creative commons licenses])
 
* '''additional acknowledgements''': Clemens Gößnitzer, Vikram Natarajan, Sylvia Zibuschka, Michael Harasek
 
 
 
=[http:// www.cfd.at/downloads/2014_OFoam_Tut_Example%20Seven.pdf Transient turbulence modeling (RAS,LES)]=
 
  
In this [http:// www.cfd.at/downloads/2014_OFoam_Tut_Example%20Seven.pdf pdf] you will find a written step-by-step walkthrough of the tutorial above.
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In newer versions of OpenFOAM the LES ''oneEqEddy'' model was renamed, try ''kEqn'' instead.

Revision as of 04:56, 28 July 2020

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.