CFD Online Logo CFD Online URL
Home > Forums > Main CFD Forum

why this type of bc are there?

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

LinkBack Thread Tools Display Modes
Old   January 26, 2007, 10:33
Default why this type of bc are there?
Posts: n/a
I have query that, why for comp flow we are using mass flow at inlet and for external flow we can use velo at inlet? pls reply Thanks

  Reply With Quote

Old   January 26, 2007, 14:12
Default Re: why this type of bc are there?
Posts: n/a
Maybe because in a steady flow computation you eventually want to have mass in = mass out for the internal case, and for an external flow case we don't have that as a hard and fast restriction (i.e. mass can leave along multiple parts of the farfield boundary), and the flow at the boundary can adjust to account for global conservation.
  Reply With Quote

Old   January 26, 2007, 14:51
Default Re: why this type of bc are there?
Posts: n/a
Also note that typically these are among the easiest and most natural quantities to define at those particular boundaries from a problem definition perspective.
  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
boundary conditions for simpleFoam calculation foam_noob OpenFOAM Running, Solving & CFD 8 July 1, 2015 08:07
second order schemes marine OpenFOAM 66 October 26, 2014 12:10
Need help with boundary conditions: open to atmosphere Wolle OpenFOAM 2 April 11, 2011 07:32
Pressure instability with rhoSimpleFoam daniel_mills OpenFOAM Running, Solving & CFD 44 February 17, 2011 18:08
Problem with compile the setParabolicInlet ivanyao OpenFOAM Running, Solving & CFD 6 September 5, 2008 20:50

All times are GMT -4. The time now is 16:25.