mshaADD A NEW RELATION TO kepsilon MODEL

msha · December 30, 2007, 10:31

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, 02:21

help pls

gschaider · January 1, 2008, 14:34

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, 08:06

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, 10:31	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, 02:21	help pls	#2
msha Member Mojtaba Shahmohammadian Join Date: Mar 2009 Posts: 73 Rep Power: 17	help pls

January 1, 2008, 14:34	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, 08:06	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

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