CFD Online Logo CFD Online URL
Home > Forums > OpenFOAM Running, Solving & CFD

Odd behaviour of pressure/velocity at the wall of a moving tube

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

LinkBack Thread Tools Display Modes
Old   May 30, 2013, 08:20
Default Odd behaviour of pressure/velocity at the wall of a moving tube
New Member
Join Date: May 2013
Posts: 1
Rep Power: 0
t.m is on a distinguished road

I am quite new to OpenFOAM and am currently working on the simulation of a tube oscillating at a high frequency (see picture).

I've tried both an open tube with a constant internal flow and a closed one without any internal flow at all. The case is solved using pimpleDyMFoam with angular oscillating displacement. The boundary conditions of the walls are set as movingWallVelocity (0 0 0) for U, respectively as zeroGradient for p (the case with inflow uses different conditions for the inlet and outlet).
The simulation itself appears to converge just fine, the final velocity and pressure fields, however, keep showing strange results at the walls (the errors in the middle are likely created due to the grid transition in the corners of the central square; see picture).



Has anyone experienced similar problems? Are maybe even the boundary conditions (especially the one for the pressure) wrong, as there actually should be some gradient due to inertia?

Thank you in advance,
t.m is offline   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
Water subcooled boiling Attesz CFX 7 January 5, 2013 04:32
[ICEM] Export ICEM mesh to Gambit / Fluent romekr ANSYS Meshing & Geometry 1 November 26, 2011 13:11
How to make boundary layer mesh moving with wall wayne FLUENT 3 June 11, 2008 23:23
moving wall settings Nikolaos FLUENT 0 September 20, 2006 06:18
moving wall BC problem Sourabh Main CFD Forum 1 August 8, 2006 07:47

All times are GMT -4. The time now is 23:47.