LRR turbulence model - initial condition set up

Davide_sd · September 19, 2013, 15:46

Hi all,
i'm looking for informations / tutorials / guidelines in order to setup a simulation with LRR turbulence model.
The paper i'm following provides me the turbulence profiles: $\overline{u'u'}$ , $\overline{v'v'}$ and $-\overline{u'v'}$

I've seen its possible to define the R tensor with constant values. Is it possible to use profiles instead?

cfdonline2mohsen · September 20, 2013, 04:37

Dear Davide

About your last question:
Yes. it is possible. there are a lot of posts here in cfd-online regarding this matter.
search the forums for timeVaryingMappedFixedValue or swak4Foam.

Davide_sd · September 20, 2013, 04:54

i Know about the timeVarying...
my question is more specific...
if I want to use a profile for velocity, I create a file U for the velocity values in caseDir/constants/boundary data/inletPatch

what file should I create in order to declare turbulence stresses profiles?

cfdonline2mohsen · September 20, 2013, 07:43

There is a tutorial in OpenFOAM which uses timeVaryingMappedFixedValue for inlet: pitzDailyExptInlet

your boundaryData must be something like this: boundaryData

you must add your R inlet Values to this folder: 0

And then in your 0 folder, specify

Code:

{
        type            timeVaryingMappedFixedValue;
        setAverage      off;
    }

for R at inlet.

Davide_sd · September 20, 2013, 08:14

how am i supposed to separate the the three turbulence stresses profiles?

cfdonline2mohsen · September 20, 2013, 13:57

R is a symmetric tensor that requires 6 components (not 3). have a look at the U in 0
write R according to it but with 6 components not 3.

September 19, 2013, 15:46	LRR turbulence model - initial condition set up	#1
Davide_sd Member Davide Join Date: Dec 2012 Posts: 33 Rep Power: 13	Hi all, i'm looking for informations / tutorials / guidelines in order to setup a simulation with LRR turbulence model. The paper i'm following provides me the turbulence profiles: $\overline{u'u'}$ , $\overline{v'v'}$ and $-\overline{u'v'}$ I've seen its possible to define the R tensor with constant values. Is it possible to use profiles instead?

September 20, 2013, 04:37		#2
cfdonline2mohsen Senior Member Mohsen KiaMansouri Join Date: Jan 2010 Location: CFD Lab Posts: 118 Rep Power: 16	Dear Davide About your last question: Yes. it is possible. there are a lot of posts here in cfd-online regarding this matter. search the forums for timeVaryingMappedFixedValue or swak4Foam. __________________ “If you have an apple and I have an apple and we exchange these apples then you and I will still each have one apple. But if you have an idea and I have an idea and we exchange these ideas, then each of us will have two ideas.”

September 20, 2013, 07:43		#4
cfdonline2mohsen Senior Member Mohsen KiaMansouri Join Date: Jan 2010 Location: CFD Lab Posts: 118 Rep Power: 16	There is a tutorial in OpenFOAM which uses timeVaryingMappedFixedValue for inlet: pitzDailyExptInlet your boundaryData must be something like this: boundaryData you must add your R inlet Values to this folder: 0 And then in your 0 folder, specify Code: { type timeVaryingMappedFixedValue; setAverage off; } for R at inlet. __________________ “If you have an apple and I have an apple and we exchange these apples then you and I will still each have one apple. But if you have an idea and I have an idea and we exchange these ideas, then each of us will have two ideas.”

September 20, 2013, 13:57		#6
cfdonline2mohsen Senior Member Mohsen KiaMansouri Join Date: Jan 2010 Location: CFD Lab Posts: 118 Rep Power: 16	R is a symmetric tensor that requires 6 components (not 3). have a look at the U in 0 write R according to it but with 6 components not 3. lpz456 likes this. __________________ “If you have an apple and I have an apple and we exchange these apples then you and I will still each have one apple. But if you have an idea and I have an idea and we exchange these ideas, then each of us will have two ideas.”

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Superlinear speedup in OpenFOAM 13	msrinath80	OpenFOAM Running, Solving & CFD	18	March 3, 2015 06:36
Moving mesh	Niklas Wikstrom (Wikstrom)	OpenFOAM Running, Solving & CFD	122	June 15, 2014 07:20
pimpleFoam: turbulence->correct(); is not executed when using residualControl	hfs	OpenFOAM Running, Solving & CFD	3	October 29, 2013 09:35
Extremely slow simulation with interDyMFoam	jrrygg	OpenFOAM Running, Solving & CFD	9	April 23, 2013 11:14
calculation stops after few time steps	sivakumar	OpenFOAM Running, Solving & CFD	7	March 17, 2013 07:37

September 20, 2013, 04:54		#3
Davide_sd Member Davide Join Date: Dec 2012 Posts: 33 Rep Power: 13	i Know about the timeVarying... my question is more specific... if I want to use a profile for velocity, I create a file U for the velocity values in caseDir/constants/boundary data/inletPatch what file should I create in order to declare turbulence stresses profiles?

September 20, 2013, 08:14		#5
Davide_sd Member Davide Join Date: Dec 2012 Posts: 33 Rep Power: 13	how am i supposed to separate the the three turbulence stresses profiles?