# free stream boundary condition

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

 June 26, 2001, 02:46 free stream boundary condition #1 L. Tao Guest   Posts: n/a What are the proper words for explaining physically the free stream boundary condition?

 June 26, 2001, 04:40 Re: free stream boundary condition #2 Kike Guest   Posts: n/a Dear Tao I haven't an exact way to explain it physically. As you should allways have to fix BC in your formulations, it is very usefull (from analytical point of view) to use infinity as a "point" to fix a BC. There, according to the equations you have, you can easily (+/-) fix a behavior for the magnitudes you are calculating. Nevertheless, from a numerical point of view, the infinity could be practically unaccesible. So, you need to use a kind of BC that allows the system behaves driven by the present physical mechanisms and that is why you impose a free stream BC (or open BC); because you HAVEN'T A WAY (PHYSICALLY SUSTAINED) TO FIX A BEHAVIOR FOR YOUR VARIABLES AT THAT COORDINATES. In this case FREE means 'I let the system do whatever it want'. Therefore, I think the physical interpretation of your imposed "free stream BC" comes from the evolution of your system at those points and the adaptability of your numerical BC to match the physical mechanisms you have to deal with at those points. Regards Kike

 Thread Tools Display Modes Linear Mode

 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 OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post peob OpenFOAM Running, Solving & CFD 2 August 14, 2014 09:07 emanuele FLUENT 0 March 19, 2007 11:45 Leentje FLUENT 2 October 11, 2006 08:48 mike NUMECA 3 June 8, 2006 06:23 Mark CFX 6 November 15, 2004 16:55

All times are GMT -4. The time now is 12:25.