Navier-Stokes-equation

idrama · December 6, 2010, 13:28

Hallo folks!

Does anybody know, if the Navier-Stokes equation also contains the represents turbulent flow?

julien.decharentenay · December 6, 2010, 19:23

Hi,
I believe they do, provided you have the proper mesh and time-step resolution (i.e. DNS).
For engineering problems, these resolutions can usually not be achieved hence the use of turbulence models...
Julien

akOOma · December 7, 2010, 02:23

As long as they are not averaged and no turbulence model is being used, they represent turbulent flow as well. However, like julien said, your mesh has to be fine enough to resolve all turbulent structures (referred to as Direct Numerical Simulation)

December 6, 2010, 13:28	Navier-Stokes-equation	#1
idrama Senior Member Claus Meister Join Date: Aug 2009 Location: Wiesbaden, Germany Posts: 241 Rep Power: 18	Hallo folks! Does anybody know, if the Navier-Stokes equation also contains the represents turbulent flow?

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December 6, 2010, 19:23		#2
julien.decharentenay Senior Member Julien de Charentenay Join Date: Jun 2009 Location: Australia Posts: 231 Rep Power: 18	Hi, I believe they do, provided you have the proper mesh and time-step resolution (i.e. DNS). For engineering problems, these resolutions can usually not be achieved hence the use of turbulence models... Julien

December 7, 2010, 02:23		#3
akOOma New Member Michael Woopen Join Date: Nov 2010 Location: Aachen, Germany Posts: 12 Rep Power: 15	As long as they are not averaged and no turbulence model is being used, they represent turbulent flow as well. However, like julien said, your mesh has to be fine enough to resolve all turbulent structures (referred to as Direct Numerical Simulation)