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

Farfield BCs for wing in free flow

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   February 9, 2021, 07:41
Post Farfield BCs for wing in free flow
  #1
New Member
 
Jamie MacLeod
Join Date: May 2020
Posts: 9
Rep Power: 6
jammy4536 is on a distinguished road
I have a simulation of an M6 wing, that is having trouble with the farfield boundary. The farfield is hemispherical, with a symmetry plane.

At the inlet side of the hemisphere, the pressure is significantly lower than it should, but velocity is more or less what it should be. However after the lower pressure, the velocity surrounding the wing is lower than it should be. Currently the BCs are freestreamVelocity (Vinf = 39.93) and freestreamPressure (Pinf = 101353).

In various 2D sims I've done around aerofoils, these BCs have worked perfectly well, so I'm really confused why they aren't giving a good BC for this 3D sim. My best guess is something about it interacting with the symmetry plane, but that still doesn't help me fix the issue.

Any help is much appreciated!
Attached Images
File Type: jpg U_Far.jpg (25.1 KB, 4 views)
File Type: jpg p_far.jpg (25.0 KB, 4 views)
jammy4536 is offline   Reply With Quote

Old   February 11, 2021, 12:02
Default
  #2
New Member
 
Jamie MacLeod
Join Date: May 2020
Posts: 9
Rep Power: 6
jammy4536 is on a distinguished road
So this was simply a very trivial mistake...
I put the vertical velocity component in the y-direction, not the z-direction. This made it seem like it was coming out of the symmetry plane, and caused the anomaly. Works perfectly fine when in the correct axis.
jammy4536 is offline   Reply With Quote

Reply

Tags
boundary condition error, buoyanboussinesqsimple, simplefoam

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
3D Fan:Calculation of induced flow rate by fan rotation at free delivery Catthan FLUENT 3 November 6, 2013 06:19
Multi phase flow VS Free surface flow Kiffer Main CFD Forum 0 November 17, 2012 01:17
Mass flow BCs and Pressure differential BC CFDLife CFX 5 January 26, 2009 08:14
Multiphase flow. Dispersed and free surface model Luis CFX 8 May 29, 2007 19:13
BCs of Free convection flow Polly CFX 0 February 4, 2003 05:25


All times are GMT -4. The time now is 13:53.