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

nutUSpaldingWallFunсtion gets wrong pressure component of force

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   June 17, 2014, 08:49
Default nutUSpaldingWallFunсtion gets wrong pressure component of force
  #1
New Member
 
Alexander
Join Date: Dec 2009
Location: Saint-Petersburg
Posts: 29
Rep Power: 16
Svensson is on a distinguished road
Send a message via Skype™ to Svensson
Hello to all.
I have some problems with evaluation of forces in LES calculation (Smagorinsky model) using nutUSpaldingWallFunction. I use pimpleDyMFoam as a solver in staticFvMesh mode.

Firstly I would like to describe my problem: I calculate flows over ellipsoid (diameter/length 1:6) and when I have small attack angles (from 0 to 10) I get forces very similar to forces calculated with RANS mathod of the same case. But above 20 degrees - I get forces very different to boundary conditions and type of simulation.

If I use nutUSpaldingWallFunction, the range of forces is about:
forces(pressure,viscous)
(37.50837233 -0.3207277896 92.56263734),(19.32228817 7.494549963e-06 -0.6408733014)
moment(pressure,viscous)
(-0.06406177929 67.70941945 -0.1111197376),(3.2437242e-05 0.3007978313 0.0001052868578)

But if I set zeroGradient I get forces:
forces(pressure,viscous)
(133.3884806 2.771016793 270.0308506),(58.4344816 0.05374480749 -5.308788023)
moment(pressure,viscous)
(0.3386124596 51.09489828 0.5863830054),(0.002957706558 2.333681177 0.005048023672)

And finally if I simulate my problem in laminar mode I get forces:
forces(pressure,viscous)
(86.36685283 -2.51870395 186.002309),(4.126058039 0.0002311758685 -0.9988433552)
moment(pressure,viscous)
(-0.46235493 53.11159684 -0.8013332792),(0.0001077252326 0.0819613383 -1.885974301e-05)
Svensson is offline   Reply With Quote

Reply

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
Pressure force calculation in incompressible solvers philippose OpenFOAM Running, Solving & CFD 10 December 7, 2019 05:51
Pressure Outlet Guage pressure Mohsin FLUENT 36 April 29, 2016 18:16
Get friction force and pressure force Kiffer Main CFD Forum 0 September 7, 2012 22:54
Pressure BC for combustion chamber Giuki FLUENT 1 July 19, 2011 12:35
decreaing pressure force in 2phase model michaelzhang FLUENT 0 February 26, 2010 09:27


All times are GMT -4. The time now is 07:32.