CFD Online Logo CFD Online URL
Home > Forums > FLUENT

2D Reynold Equations

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

LinkBack Thread Tools Display Modes
Old   February 9, 2005, 12:44
Default 2D Reynold Equations
Alok Kumar
Posts: n/a
Dear Friends If we analyse the flow field for turbulent flow in 2D duct using 2D version of fluent.What form of Reynolds equation we solved? can we say that W,w' and z derivative becomes zero? Because the turbulence is a 3d phenomenon. I will be grateful if any body clear my doubts.
  Reply With Quote

Old   February 9, 2005, 18:00
Default Re: 2D Reynold Equations
Posts: n/a
I coud be long to explain, the third eq is not considered, for many cases is a good aproximation even if it is not the right way, you must stablish some hypothesis to make you 2D simulation a valid one, but if you really wanna learn try some books,

Wilcox D.C. Turbulence modeling for CFD (1994) Versteeg H.K., Malalasekera W. Introduction to computational fluid dynamics. The finite volume method (Longman, 1995)


good luck

  Reply With Quote

Old   February 10, 2005, 05:06
Default Re: 2D Reynold Equations
Posts: n/a
Since ur considering 2-D and there is no point of other direction i mean in Z dir, obivosuly all the term in N-S equation containing z derivative will be zero and which reduces 2-D with 2 eqations, and since u r case is turbulent and if u consider RANS concept u have to average everything. So while averaging u have to consider mean and fluctuating part and apply in NS Eq u will get averaged equation with Reynolds stresses.
  Reply With Quote

Old   February 10, 2005, 13:19
Default Re: 2D Reynold Equations
Posts: n/a

I look for commercial program (based on finite element method or final difference method) that can solve elastic problem and fluid-flow problems. I am working on an Elasto-Hydro-Dynamic problem, i.e. solving simultaneously Reynolds equation (possibly Stokes/Navier-Stokes equations) with CAVITATION effect and equation of elastic deformation (same as problem of flow over elastic plate). If you deal with the same program, answer me please.

Thank you
  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
Guide: Writing Equations in LaTeX on the CFD Online Forums pete Site Help, Feedback & Discussions 20 June 16, 2015 13:52
CFD governing equations m.gos Main CFD Forum 0 April 30, 2011 14:21
solving only turbulence equations afroz_javed OpenFOAM 1 January 20, 2011 06:25
Maths problem when deriving conservation of energy equations. Demonwolf Main CFD Forum 1 June 15, 2009 14:21
Euler equations? Jan Ramboer Main CFD Forum 2 August 19, 1999 01:58

All times are GMT -4. The time now is 01:43.