CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > Siemens

Wall Shear force - any suggestions on turbulence modelling

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

LinkBack Thread Tools Search this Thread Display Modes
Old   February 22, 2000, 08:00
Default Wall Shear force - any suggestions on turbulence modelling
Bo Jensen
Posts: n/a
Hallo everybody

In my work i am currently calculating on a valve with a rather complex flow pattern. Highly turbulent. I am specially interested in simulating the wall shear forces as correct as possible. For this I have a couple of questions for the Forum:

1) any suggestions to the choice of turbulence model and not least the choise of wall threatment (should I use a two-layer model or just a regular low-reynolds number k-e model)?

2) For the verification of the simulations I have the possibility to make velocity measurements in the main flow of the valve. Now, if the verification of the CFD calculations looks alright for the main flow, then it would not be totally wrong to presume that the CFD-simulations also give a result for the wall shear stress that approximates the once excisting in the valve??

Yours Sincerly

  Reply With Quote

Old   February 22, 2000, 12:12
Default Re: Wall Shear force - any suggestions on turbulence modelling
John C. Chien
Posts: n/a
(1). Try a two-layer model first. (2). The wall shear stress is very hard to predict accurately. In the complicated flow field, the main flow is more or less controlled by the continuity equation (mass conservation), while the wall shear stress is controlled by the momentum equations. you will have to match both the velocity field and the pressure field everywhere in order to get the correct wall shear stress.
  Reply With Quote


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
suggestions for turbulence model Li CFX 5 November 21, 2008 03:44
wall shear force with VOF J├╝rgen FLUENT 0 July 27, 2007 06:28
shear force and flow direction ingear Siemens 0 March 3, 2006 14:13
UDF for shear force kiran FLUENT 0 July 15, 2003 17:45
Wall Shear Force Bo B. B. Jensen Main CFD Forum 3 January 28, 2000 17:48

All times are GMT -4. The time now is 06:42.