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

Surface normal velocity BC with zero gradient tangential, cylinder

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   May 25, 2013, 08:22
Default Surface normal velocity BC with zero gradient tangential, cylinder
  #1
Member
 
Cameron
Join Date: Jul 2012
Posts: 33
Rep Power: 14
c_dowd is on a distinguished road
Hi all.
I have a cylindrical flow in which I am specifying the velocity at the cylinder surface (flowing inwards) and having the top of the cylinder as a fixed pressure outlet. I would like
to create a boundary condition where only the surface normal velocity (ie; radial component) is specified, and there is a zero gradient condition in the tangential directions.

Currently I'm using the cylindricalvelocityinlet condition from the following thread:
http://www.cfd-online.com/Forums/ope...-openfoam.html
which works perfectly except for the shear it applies to the flow as it moves tangentially against the boundary. Basically I want a flow where no vorticity is generated (except along the bottom boundary), which is not what I am currently getting. Below I've attached a plot of the vorticity in the out of page direction, showing the effect of the shear on the flow.



I don't have a good enough understanding of the BC codes to create my own, and I'm not sure how I would create such a condition in groovyBC. Any help?
c_dowd is offline   Reply With Quote

Reply

Tags
cylinder, cylindrical, surface normal, velocity bc


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
Surface tangential gradient nzy102 OpenFOAM Post-Processing 2 December 5, 2018 10:50
ActuatorDiskExplicitForce in OF2.1. Help be_inspired OpenFOAM Programming & Development 10 September 14, 2018 12:12
Surface normal gradient on unstructured mesh fumiya OpenFOAM 1 September 30, 2011 05:34
NACA0012 geometry/design software needed Franny Main CFD Forum 13 July 7, 2007 16:57
velocity normal to the surface srinivas Siemens 1 May 30, 2007 03:03


All times are GMT -4. The time now is 11:22.