CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > CFX

Unsteady Flow Initial Conditions

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

Reply
 
LinkBack Thread Tools Display Modes
Old   March 16, 2011, 15:40
Default Unsteady Flow Initial Conditions
  #1
New Member
 
Brady
Join Date: Jan 2011
Location: Calgary, Alberta, Canada
Posts: 12
Rep Power: 6
recon9 is on a distinguished road
I am curious as to what the initial conditions within the setup initialization refers to. I have a domain with fluid flowing in at 29m/s in +U direction. If I set the initial condition to 29m/s does that mean the fluid entering the domain is traveling at that speed or does it mean the domain is traveling at that speed?

I want the domain to remain stationary, that is why I ask. I have been entering 0 for U, V, W and it takes a while for the solution to converge but it also looks like the solution is starting with the fluid flow at 0 then speeding up to 29.

Thanks for your insight.

Brady
recon9 is offline   Reply With Quote

Old   March 16, 2011, 19:37
Default
  #2
Senior Member
 
Joshua Counsil
Join Date: Jul 2009
Location: Halifax, Nova Scotia, Canada
Posts: 366
Rep Power: 9
Josh is on a distinguished road
Initialization refers to the entire domain. So if your initial velocity is 29 m/s, the entire domain will experience this simultaneously. It your initial velocity is 0 and the inlet velocity is 29 m/s, the simulation will take longer since the flow will have to first travel from the inlet to your region of interest.
Josh is offline   Reply With Quote

Reply

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
Darcy-Forchheimer law for specifying Porous Zones Ger_US OpenFOAM Running, Solving & CFD 23 July 30, 2015 13:00
Problem running buoyantFoam anke OpenFOAM 4 August 28, 2013 04:43
ForcesCoeffs ronaldo OpenFOAM 4 September 14, 2009 07:11
Unknown error sivakumar OpenFOAM Pre-Processing 9 September 9, 2008 12:53
Initial Conditions in unsteady turbulent flow Z. Zeng Main CFD Forum 5 April 28, 1999 17:38


All times are GMT -4. The time now is 12:00.