CFD Online Logo CFD Online URL
Home > Forums > Main CFD Forum

two point averaging

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

LinkBack Thread Tools Display Modes
Old   September 2, 1998, 09:12
Default two point averaging
Posts: n/a
What advantageous if any are gained for a turbulence model based on a 2 point averaging techniques.


  Reply With Quote

Old   September 2, 1998, 09:36
Default Re: two point averaging
Posts: n/a

Could you please elaborate on the concept of 2 point averaging and its relationship to turbulence modelling.
  Reply With Quote

Old   September 2, 1998, 11:23
Default Re: two point averaging
Posts: n/a
The correlation's for the majority of turbulence models are derived via one-point fluctuations. In order to derive the RANS equations the properties at one point in the flow can be expressed as the sum of the mean + fluc. Components. However two point averaging is based on two points in the flow (i.e. at X and X+deltaX).

Models such as Rotta, (Zeiermann et al) and Anderson used two point averaging to obtain there first order closure models. Just heard of these T modelsI and I am not really familiar with such models.

All I want to know is what advantages are gained from two-point closure models, if any and why aren't they more available in Commercial CFD packages.

Thanks in Advance


  Reply With Quote

Old   September 3, 1998, 04:37
Default Re: two point averaging
Stephane Baralon
Posts: n/a
Hi oliver,

I am not a specialist in the k-kl or k-t models, but from a physical point of view, a two-points correlation approach would be suitable for turbulence related process which are not local but, on the contrary , result from the contribution of several physical locations. A good example of that is the pressure-strain term that arises in the second-Order closure models.

Therefore, I would advise you to look at reviews of Speziale, one of the gurus in EARSM model.


  Reply With Quote


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
Starting field averaging using libFunctionObject after certain time eelcovv OpenFOAM Programming & Development 25 December 7, 2015 23:28
block-structured mesh for t-junction Robert@cfd ANSYS Meshing & Geometry 20 November 11, 2011 05:59
Problem with UDF compiling for kTkLW model Wantami FLUENT 0 July 18, 2011 05:11
Gmsh and samplesurface touf Open Source Meshers: Gmsh, Netgen, CGNS, ... 2 December 10, 2007 03:27
CFX4.3 -build analysis form Chie Min CFX 5 July 12, 2001 23:19

All times are GMT -4. The time now is 17:19.