CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Running, Solving & CFD

Accuracy of LRR and SSG in turbulent channel flow

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   August 16, 2016, 14:25
Default Accuracy of LRR and SSG in turbulent channel flow
  #1
Member
 
Darko Radenkovic
Join Date: Oct 2015
Posts: 38
Rep Power: 10
dradenkovic is on a distinguished road
Hello.

I am simulating steady, incompressible flow in channel. Dimensions of channel are:
length 6 m, width 350 mm, and height 35 mm.

I did simulations with two RSMs - LRR and SSG. When I compare results of simulations with experimental and DNS data, I see that accuracy of simulations can be improved. Measuring section is at 5.8 m from the inlet.

Figures are on the following links (from some reason, I couldn't attach pictures on this page)

LRR comparison


Here is comparison for SSG simulation:
SSG comparison



I don't have exact DNS data for this case, but I used data for channel flow where Re number is around 40 000 so I believe it can be used for verification, when data are nondimensionalised.

Information about setup are here:

CheckMesh

fvSchemes

fvSolution

Any suggestion to improve accuracy of these simulations?

Best regards,
Darko
dradenkovic is offline   Reply With Quote

Old   August 23, 2016, 13:03
Default
  #2
Member
 
Darko Radenkovic
Join Date: Oct 2015
Posts: 38
Rep Power: 10
dradenkovic is on a distinguished road
Here are velocity profiles that I have as a result of a several simulations.

https://www.dropbox.com/s/eyd4tk3rid...Phase.eps?dl=0

I have error around 5% in velocity profile. What can I do to reduce it? I did simulations on various meshes, but the result is the same.

I have trouble to verify RMS values (from above post). Maybe that difference in RMS values (which is causing me troubles) is due to difference in velocity profiles. That is why I need to correct velocity profile.

Here is complete case of steady, incompressible, turbulent channel flow, k - epsilon model.

https://www.dropbox.com/s/z1w7bu9mv1...imple.zip?dl=0

Any suggestion is appreciated.

Best regards,
Darko
dradenkovic is offline   Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On



All times are GMT -4. The time now is 04:17.