Laminar vs. turbulence model

nico.frisone · January 24, 2019, 08:33

Guys i have a stupid question, usually in fluent when we have a high Reynolds number we use a turbulence model like k-epsilon, k-omega ecc.. and the equations that we are solving are the RANS.So, when we don't use the turbulence model the governing equations are still the Reynolds averaged NS, or the method is different? If not what are we solving, just a discretization of NS? thank you in advance.

LuckyTran · January 24, 2019, 10:15

The governing equation is the same. Laminar is just RANS without any eddy viscosity.

nico.frisone · January 24, 2019, 10:41

Thank you so much

January 24, 2019, 08:33	Laminar vs. turbulence model	#1
nico.frisone New Member Nicolo' Frisone Join Date: Jan 2019 Posts: 3 Rep Power: 7	Guys i have a stupid question, usually in fluent when we have a high Reynolds number we use a turbulence model like k-epsilon, k-omega ecc.. and the equations that we are solving are the RANS.So, when we don't use the turbulence model the governing equations are still the Reynolds averaged NS, or the method is different? If not what are we solving, just a discretization of NS? thank you in advance.

January 24, 2019, 10:15		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,754 Rep Power: 66	The governing equation is the same. Laminar is just RANS without any eddy viscosity. nico.frisone likes this.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Only two turbulence options available in CFX Pre	Jack001	CFX	5	March 30, 2016 03:47
Turbulence model choice	dave13	CFX	3	December 22, 2015 08:12
turbulence model for Refrigerator	cicatrix	Main CFD Forum	0	October 3, 2012 02:47
What model of turbulence choose to study an external aerodynamics case	raffale	OpenFOAM	0	August 23, 2012 06:45
Turbulence and Laminar model for empty narrow chan	KKLAU	FLUENT	5	October 18, 2004 18:36

January 24, 2019, 10:41		#3
nico.frisone New Member Nicolo' Frisone Join Date: Jan 2019 Posts: 3 Rep Power: 7	Thank you so much