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

mesh independence

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

Like Tree1Likes
  • 1 Post By bigphil

Reply
 
LinkBack Thread Tools Display Modes
Old   February 6, 2018, 19:20
Default mesh independence
  #1
Senior Member
 
Ahmed Khattab's Avatar
 
ahmed
Join Date: Feb 2010
Posts: 177
Blog Entries: 1
Rep Power: 10
Ahmed Khattab is on a distinguished road
Hi Foamers,

in order to perform a mesh independence study, it is mandatory to use two meshes at least with different spacing, then compare one field or more through the different grids.

my questions is how to get the values of a specific field at a specific point in the two grids specially if the grids are not halved/doubled (ex: h2/h1 =1.5).

thanks,
Ahmed Khattab is offline   Reply With Quote

Old   February 11, 2018, 08:49
Default
  #2
Senior Member
 
bigphil's Avatar
 
Philip Cardiff
Join Date: Mar 2009
Location: Dublin, Ireland
Posts: 666
Rep Power: 24
bigphil will become famous soon enoughbigphil will become famous soon enough
Quote:
Originally Posted by Ahmed Khattab View Post
Hi Foamers,

in order to perform a mesh independence study, it is mandatory to use two meshes at least with different spacing, then compare one field or more through the different grids.

my questions is how to get the values of a specific field at a specific point in the two grids specially if the grids are not halved/doubled (ex: h2/h1 =1.5).

thanks,
The following publication has a useful discussion:
Roache, P, QUANTIFICATION OF UNCERTAINTY IN COMPUTATIONAL FLUID DYNAMICS, Annual Review of Fluid Mechanics, Vol. 29:123-160, 1997, https://doi.org/10.1146/annurev.fluid.29.1.123

You would have to interpolate your field using a method that has at least the same order of accuracy as your solution method (and, I guess, a similar absolute accuracy).
Ahmed Khattab likes this.
bigphil is offline   Reply With Quote

Reply

Thread Tools
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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Transient mode simulation (VoF model) mesh independence study problem yulu FLUENT 4 September 20, 2016 17:30
No layers in a small gap bobburnquist OpenFOAM Native Meshers: snappyHexMesh and Others 6 August 26, 2015 09:38
Layers:problem with curvature giulio.topazio OpenFOAM Native Meshers: snappyHexMesh and Others 10 August 22, 2012 09:03
external flow with snappyHexMesh chelvistero OpenFOAM 11 January 15, 2010 20:43
Mesh Independence - Valid Strategy? Ianto Main CFD Forum 2 August 31, 2009 04:36


All times are GMT -4. The time now is 11:45.