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

Surface normal velocity BC with zero gradient tangential, cylinder

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

LinkBack Thread Tools Display Modes
Old   May 25, 2013, 07:22
Default Surface normal velocity BC with zero gradient tangential, cylinder
New Member
Join Date: Jul 2012
Posts: 22
Rep Power: 5
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:
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


cylinder, cylindrical, surface normal, velocity bc

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
ActuatorDiskExplicitForce in OF2.1. Help be_inspired OpenFOAM Programming & Development 8 July 3, 2014 10:54
Surface normal gradient on unstructured mesh fumiya OpenFOAM 1 September 30, 2011 04:34
Surface tangential gradient nzy102 OpenFOAM Post-Processing 1 October 15, 2008 02:22
NACA0012 geometry/design software needed Franny Main CFD Forum 13 July 7, 2007 15:57
velocity normal to the surface srinivas CD-adapco 1 May 30, 2007 02:03

All times are GMT -4. The time now is 01:16.