mshaADD A NEW RELATION TO kepsilon MODEL

msha · December 30, 2007, 09:31

HI

I want to use the following relation

R_=(2*k_/3)*I + ((k_*(1-Clrr2))/(Clrr1+Glrr/epsilon_-1))*(Plrr/epsilon_ - (2*Glrr/(3*epsilon_))*I)

[where

Plrr = -twoSymm(Rlrr_ & fvc::grad(U_))

Glrr =0.5*tr(Plrr)

and Clrr1,Clrr2 are constants.]

in k-epsilon model insted of bossinesque relation:

{(2.0/3.0)*I*k_ - nut_*2*symm(fvc::grad(U_))}

for reynolds stress tensor.

HOW I CAN DO THIS?

ANY COMMENT IS APPRECIATED DEEPLY.

THANKS IN ADVANCE.

MSHA

msha · December 31, 2007, 01:21

help pls

gschaider · January 1, 2008, 13:34

I guess you'll have to implement a new turbulence model. For instance have a look at:
http://openfoamwiki.net/index.php/Sig_Turbomachinery_/_Tutorials#How_to_implemen t_a_new_turbulence_model_.28OF-1.4.1.29

msha · January 6, 2008, 07:06

HI Bernhard Gschaider

AND thank you

but I know much more than that the page you have addressed .my probles is an error you can see in previous my message

THANKS ANY WAY

December 30, 2007, 09:31	HI I want to use the follow	#1
msha Member Mojtaba Shahmohammadian Join Date: Mar 2009 Posts: 73 Rep Power: 17	HI I want to use the following relation R_=(2k_/3)I + ((k_(1-Clrr2))/(Clrr1+Glrr/epsilon_-1))(Plrr/epsilon_ - (2Glrr/(3epsilon_))I) [where Plrr = -twoSymm(Rlrr_ & fvc::grad(U_)) Glrr =0.5tr(Plrr) and Clrr1,Clrr2 are constants.] in k-epsilon model insted of bossinesque relation: {(2.0/3.0)Ik_ - nut_2symm(fvc::grad(U_))} for reynolds stress tensor. HOW I CAN DO THIS? ANY COMMENT IS APPRECIATED DEEPLY. THANKS IN ADVANCE. MSHA

December 31, 2007, 01:21	help pls	#2
msha Member Mojtaba Shahmohammadian Join Date: Mar 2009 Posts: 73 Rep Power: 17	help pls

January 1, 2008, 13:34	I guess you'll have to impleme	#3
gschaider Assistant Moderator Bernhard Gschaider Join Date: Mar 2009 Posts: 4,225 Rep Power: 51	I guess you'll have to implement a new turbulence model. For instance have a look at: http://openfoamwiki.net/index.php/Sig_Turbomachinery_/_Tutorials#How_to_implemen t_a_new_turbulence_model_.28OF-1.4.1.29 __________________ Note: I don't use "Friend"-feature on this forum out of principle. Ah. And by the way: I'm not on Facebook either. So don't be offended if I don't accept your invitation/friend request

January 6, 2008, 07:06	HI Bernhard Gschaider AND	#4
msha Member Mojtaba Shahmohammadian Join Date: Mar 2009 Posts: 73 Rep Power: 17	HI Bernhard Gschaider AND thank you but I know much more than that the page you have addressed .my probles is an error you can see in previous my message THANKS ANY WAY

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Modify kEpsilon model	harly	OpenFOAM	5	December 3, 2008 17:43
About kEpsilon turbulence model	osimonsimon	OpenFOAM Running, Solving & CFD	10	April 24, 2008 02:52
NACA0012 Study kepsilon Model	pda	OpenFOAM Running, Solving & CFD	1	March 11, 2008 03:12
msha ADD A NEW RELATION TO kepsilon MODEL	msha	OpenFOAM	0	December 30, 2007 09:30
Adjusting kepsilon model	braennstroem	OpenFOAM Running, Solving & CFD	2	April 12, 2005 09:52