Turbulent Intensity boundary condition

egge24 · February 4, 2015, 09:26

Hi everybody,

Does anyone know how I can precribe a turbulent intensity boundary condition at an inlet velocity boundary? I´m trying to model a 3d rectangular channel with a constant flow and constant turbulent intensity of 10% at the inlet.

Thank you.

Regards,

egge24

marauder · February 4, 2015, 10:53

Select a turbulence model then go to inlet boundary condition, at the bottom in first tab select Intensity & Hydraulic diameter and the give the values.
Intensity & viscosity ratio can also be selected if you can calculate them.

egge24 · February 4, 2015, 11:23

Marauder,

Thank you for your fast response.

I did that, but once I run my model in steady state the surface contour of the inlet shows values of Turbulence below 10%, see figure. I want the lowest value of turbulence intensity at the inlet to be 10%.

Any ideas?

Thank you

February 4, 2015, 09:26	Turbulent Intensity boundary condition	#1
egge24 Member Join Date: Jan 2011 Posts: 45 Rep Power: 15	Hi everybody, Does anyone know how I can precribe a turbulent intensity boundary condition at an inlet velocity boundary? I´m trying to model a 3d rectangular channel with a constant flow and constant turbulent intensity of 10% at the inlet. Thank you. Regards, egge24

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Problem with divergence	TDK	FLUENT	13	December 14, 2018 06:00
turbulent boundary condition for inlet half sphere shape	asal	FLUENT	0	January 7, 2014 11:09
Error finding variable "THERMX"	sunilpatil	CFX	8	April 26, 2013 07:00
Turbulent intensity for pressure Outlet Boundary condition	Mohsin	FLUENT	1	April 30, 2010 10:36
setting value of turbulent intensity and turbulent viscosity ratio in wind tunnel	nuimlabib	Main CFD Forum	0	August 4, 2009 00:05

February 4, 2015, 10:53		#2
marauder Member Anonymous Join Date: Mar 2014 Posts: 84 Rep Power: 12	Select a turbulence model then go to inlet boundary condition, at the bottom in first tab select Intensity & Hydraulic diameter and the give the values. Intensity & viscosity ratio can also be selected if you can calculate them.

February 4, 2015, 11:23		#3
egge24 Member Join Date: Jan 2011 Posts: 45 Rep Power: 15	Marauder, Thank you for your fast response. I did that, but once I run my model in steady state the surface contour of the inlet shows values of Turbulence below 10%, see figure. I want the lowest value of turbulence intensity at the inlet to be 10%. Any ideas? Thank you