stressComponents utility in LES calculations

vkrastev · February 25, 2010, 12:25

Hi everybody,
I'm working on a 2d LES simulation on a channel flow. The model I use is the oneEqEddy, with the same settings of the pitzDaily LES pisoFoam tutorial. So, the matter I wish to investigate is about the meaning of the stressComponents utility output in a case such this: are these components referred to the Smagorinski stress tensor (TAUsgs)? If they not, what actually do they represent in a LES simulation?

Thank you in advance

vkrastev · February 25, 2010, 12:44

Any replies?

vkrastev · February 26, 2010, 04:19

??????????

longamon · April 12, 2011, 12:57

In its source code, stressComponents is defined as:

laminarTransport.nu()*2*dev(symm(fvc::grad(U)))

I think it's not related to sgs stresses, its the deviatoric stress components.
(1 year late :^P)

February 25, 2010, 12:25	stressComponents utility in LES calculations	#1
vkrastev Senior Member Vesselin Krastev Join Date: Jan 2010 Location: University of Tor Vergata, Rome Posts: 368 Rep Power: 20	Hi everybody, I'm working on a 2d LES simulation on a channel flow. The model I use is the oneEqEddy, with the same settings of the pitzDaily LES pisoFoam tutorial. So, the matter I wish to investigate is about the meaning of the stressComponents utility output in a case such this: are these components referred to the Smagorinski stress tensor (TAUsgs)? If they not, what actually do they represent in a LES simulation? Thank you in advance

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February 25, 2010, 12:44		#2
vkrastev Senior Member Vesselin Krastev Join Date: Jan 2010 Location: University of Tor Vergata, Rome Posts: 368 Rep Power: 20	Any replies?

February 26, 2010, 04:19		#3
vkrastev Senior Member Vesselin Krastev Join Date: Jan 2010 Location: University of Tor Vergata, Rome Posts: 368 Rep Power: 20	??????????

April 12, 2011, 12:57		#4
longamon Member David Aljure Join Date: Mar 2011 Location: CTTC Universidad Politécnica de Catalunya. Spain Posts: 38 Rep Power: 15	In its source code, stressComponents is defined as: laminarTransport.nu()2dev(symm(fvc::grad(U))) I think it's not related to sgs stresses, its the deviatoric stress components. (1 year late :^P)