CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > General Forums > Main CFD Forum

Wall resolved epsilon

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   June 14, 2021, 11:59
Default Wall resolved epsilon
  #1
New Member
 
Lorenzo
Join Date: Apr 2021
Posts: 9
Rep Power: 3
lollo15 is on a distinguished road
Hello to all
I am trying to complete a solved simulation on the wall and I set all parameters related to turbulence, k (1e-8), Epsilon(1e-10), nut(1e-10), alphat(1e-10). But I noticed that it creates a peak near the relative wall of epsilon.
Considering that I still get a value of Y+ close to 1 to what might be related problem ?

Thanks a lot for the reply
Attached Images
File Type: jpg epsilon.jpg (35.3 KB, 6 views)
lollo15 is offline   Reply With Quote

Old   June 14, 2021, 12:53
Default
  #2
Super Moderator
 
flotus1's Avatar
 
Alex
Join Date: Jun 2012
Location: Germany
Posts: 3,168
Rep Power: 43
flotus1 has a spectacular aura aboutflotus1 has a spectacular aura about
What does the computational domain look like?
Which boundary conditions are you using?
Where did you evaluate the results shown in the chart?
What's a relative wall?
flotus1 is offline   Reply With Quote

Old   June 14, 2021, 13:49
Default
  #3
New Member
 
Lorenzo
Join Date: Apr 2021
Posts: 9
Rep Power: 3
lollo15 is on a distinguished road
Hi
My 2D domain includes two coaxial injectors from which methane and oxygen come out, in all the walls I used the condition of viscosity and velocity zero, while the values of k, nut, alphat are fixed with fixedValue. The epsilon graph is reported from the axis to the upper wall, so the x axis is the spatial coordiante and the y axis is the value of epsilon, but this condition occurs on all walls and only on the epsilon.

thanks for the reply
Attached Images
File Type: jpg domain .jpg (22.4 KB, 7 views)
File Type: jpg epsilon.jpg (35.3 KB, 8 views)
lollo15 is offline   Reply With Quote

Old   June 14, 2021, 14:35
Default
  #4
Super Moderator
 
flotus1's Avatar
 
Alex
Join Date: Jun 2012
Location: Germany
Posts: 3,168
Rep Power: 43
flotus1 has a spectacular aura aboutflotus1 has a spectacular aura about
Could you elaborate what the problem is? It is to be expected that the value of epsilon has a maximum close to the wall.
flotus1 is offline   Reply With Quote

Reply

Tags
openfoam, reactingfoam, wall resolved

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Divergence in AMG solver! marina FLUENT 20 August 1, 2020 12:30
Blowing up epsilon using wall BC interfoam josee OpenFOAM Running, Solving & CFD 3 May 15, 2017 01:39
Grid difference between wall modeled LES and wall resolved LES hityangsir Main CFD Forum 9 April 17, 2015 12:59
Radiation interface hinca CFX 15 January 26, 2014 18:11
Errors running allwmake in OpenFOAM141dev with WM_COMPILE_OPTION%3ddebug unoder OpenFOAM Installation 11 January 30, 2008 21:30


All times are GMT -4. The time now is 11:55.