standard and enhanced ?

Moataz · July 1, 2012, 11:06

Hello all,

I want to know what is the difference bet. standard wall functions and enhanced wall treatment.
Also for standard wall functions y+ if the minimum is less than 30 is that wrong? and how could i adjust its value , i use the adaption but the min always less than 30 ?

thanks in advance.

Far · July 1, 2012, 11:30

http://www.cfd-online.com/Forums/cfx/99023-wall-function.htm

Enhanced wall treatment in Fluent is equivalent to automatic wall treatment in CFX (roughly speaking)

Moataz · July 1, 2012, 11:45

thanks Far,

i understand now the difference,
but i still don`t know how to adjust the value of y+

Far · July 1, 2012, 11:59

use the yplus calculator available online and is based on flat plate formulae. It is a good starting point, later on you can fine tune yplus once you have simulation results (you should get idea within 25-40 iterations). http://geolab.larc.nasa.gov/APPS/YPlus/

Moataz · July 1, 2012, 12:10

thanks Far , i will try.

Moataz · July 1, 2012, 12:16

iam making a simulation of VAWT, will the calculator be useful ???

July 1, 2012, 11:06	standard and enhanced ?	#1
Moataz New Member Moataz Join Date: Jul 2012 Posts: 5 Rep Power: 13	Hello all, I want to know what is the difference bet. standard wall functions and enhanced wall treatment. Also for standard wall functions y+ if the minimum is less than 30 is that wrong? and how could i adjust its value , i use the adaption but the min always less than 30 ? thanks in advance.

July 1, 2012, 11:59		#4
Far Super Moderator Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,553 Blog Entries: 6 Rep Power: 54	use the yplus calculator available online and is based on flat plate formulae. It is a good starting point, later on you can fine tune yplus once you have simulation results (you should get idea within 25-40 iterations). http://geolab.larc.nasa.gov/APPS/YPlus/ Moataz likes this.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
wall roughness in enhanced wall treatment	lobstar	FLUENT	7	June 29, 2012 04:43
Enhanced Wall Treat...	Kostas Pan	FLUENT	1	November 8, 2008 09:08
y+ value too low for use in standard wall function	Allan Cross	FLUENT	3	August 26, 2005 03:11
Is Y plus =3 ok for standard wall function???	Thomas	FLUENT	4	May 12, 2005 13:08
Enhanced wall treatment?	bylin	FLUENT	3	November 21, 2003 12:33

July 1, 2012, 11:30		#2
Far Super Moderator Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,553 Blog Entries: 6 Rep Power: 54	http://www.cfd-online.com/Forums/cfx/99023-wall-function.htm Enhanced wall treatment in Fluent is equivalent to automatic wall treatment in CFX (roughly speaking)

July 1, 2012, 11:45		#3
Moataz New Member Moataz Join Date: Jul 2012 Posts: 5 Rep Power: 13	thanks Far, i understand now the difference, but i still don`t know how to adjust the value of y+

July 1, 2012, 12:10		#5
Moataz New Member Moataz Join Date: Jul 2012 Posts: 5 Rep Power: 13	thanks Far , i will try.

July 1, 2012, 12:16		#6
Moataz New Member Moataz Join Date: Jul 2012 Posts: 5 Rep Power: 13	iam making a simulation of VAWT, will the calculator be useful ???