what equation does fluent solve if the viscous model is laminar?

wxf1037 · November 23, 2013, 09:57

If the viscous model is laminar, what equation does fluent solve?

Thank you!

flotus1 · November 23, 2013, 11:43

The Navier-Stokes equations discretized by the finite volume method...

wxf1037 · November 23, 2013, 13:15

Thank you flotus1!

But I don't know can I trust the result ?

What is the difference between laminar model and turbulence model? Do you have some document about it ? If you have some, can you tell me ?

flotus1 · November 23, 2013, 16:50

There is no turbulence model involved when the viscous "model" is set to laminar.

wxf1037 · November 24, 2013, 07:39

Quote:

Originally Posted by flotus1

There is no turbulence model involved when the viscous "model" is set to laminar.

Thank you .
I got clear about it . Does it like a DNS simulation? But because of the mesh size , it can't get the turbulence.

flotus1 · November 24, 2013, 09:30

With the viscous model set to laminar in Fluent, you are performing a DNS.
But as you already noticed, the results are affected by the discretization so you have to be very careful when trying to simulate turbulent flows.

I wonder if anyone has ever successfully conducted a DNS of a 3-dimensional turbulent flow with Fluent.

November 23, 2013, 09:57	what equation does fluent solve if the viscous model is laminar?	#1
wxf1037 New Member wang Join Date: Oct 2013 Posts: 5 Rep Power: 12	If the viscous model is laminar, what equation does fluent solve? Thank you!

November 24, 2013, 09:30		#6
flotus1 Super Moderator Alex Join Date: Jun 2012 Location: Germany Posts: 3,399 Rep Power: 46	With the viscous model set to laminar in Fluent, you are performing a DNS. But as you already noticed, the results are affected by the discretization so you have to be very careful when trying to simulate turbulent flows. I wonder if anyone has ever successfully conducted a DNS of a 3-dimensional turbulent flow with Fluent. rajasekar0007 and BlnPhoenix like this.

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November 23, 2013, 11:43		#2
flotus1 Super Moderator Alex Join Date: Jun 2012 Location: Germany Posts: 3,399 Rep Power: 46	The Navier-Stokes equations discretized by the finite volume method...

November 23, 2013, 13:15		#3
wxf1037 New Member wang Join Date: Oct 2013 Posts: 5 Rep Power: 12	Thank you flotus1! But I don't know can I trust the result ? What is the difference between laminar model and turbulence model? Do you have some document about it ? If you have some, can you tell me ?

November 23, 2013, 16:50		#4
flotus1 Super Moderator Alex Join Date: Jun 2012 Location: Germany Posts: 3,399 Rep Power: 46	There is no turbulence model involved when the viscous "model" is set to laminar.