non uniform boundary condition

imani · February 19, 2014, 09:00

hi
i am a new user in openFoam
i want to simulate a problem with non-uniform boundary condition (pressure,temperature,,,,)
i dont know any thing about

type
value Expression
gradientExpression
fractionExpression
value

and what i should type in front of them
please help me
thanks

Bernhard · February 19, 2014, 09:24

Please update your question so that I understand what you are actually trying? Are you actually asking "How can I implement a Robin-type boundary condition using groovyBC"?

imani · February 19, 2014, 09:55

tx for your attention
yea
i dont know about groovyBC

imani · February 19, 2014, 10:05

real i dont know how to employ a non-uniform boundary condition for example i want simulate a room with two windows and an inlet valve with different temprature in windows and zero gradient boundary condition in valve
how can i do it?

ajnewman · February 19, 2014, 13:57

Have a look at

http://www.cfd-online.com/Forums/ope...onditions.html

and

http://blog.sina.com.cn/s/blog_781cd1290101b8gp.html

imani · February 19, 2014, 15:13

can you help me about my second comment?

February 19, 2014, 09:00	non uniform boundary condition	#1
imani Member zohreh imani nejad Join Date: Feb 2014 Location: gonabad Posts: 55 Rep Power: 12	hi i am a new user in openFoam i want to simulate a problem with non-uniform boundary condition (pressure,temperature,,,,) i dont know any thing about type value Expression gradientExpression fractionExpression value and what i should type in front of them please help me thanks

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February 19, 2014, 09:24		#2
Bernhard Senior Member Bernhard Join Date: Sep 2009 Location: Delft Posts: 790 Rep Power: 21	Please update your question so that I understand what you are actually trying? Are you actually asking "How can I implement a Robin-type boundary condition using groovyBC"?

February 19, 2014, 09:55		#3
imani Member zohreh imani nejad Join Date: Feb 2014 Location: gonabad Posts: 55 Rep Power: 12	tx for your attention yea i dont know about groovyBC

February 19, 2014, 10:05		#4
imani Member zohreh imani nejad Join Date: Feb 2014 Location: gonabad Posts: 55 Rep Power: 12	real i dont know how to employ a non-uniform boundary condition for example i want simulate a room with two windows and an inlet valve with different temprature in windows and zero gradient boundary condition in valve how can i do it?

February 19, 2014, 13:57		#5
ajnewman New Member Join Date: Feb 2014 Posts: 12 Rep Power: 12	Have a look at http://www.cfd-online.com/Forums/ope...onditions.html and http://blog.sina.com.cn/s/blog_781cd1290101b8gp.html

February 19, 2014, 15:13		#6
imani Member zohreh imani nejad Join Date: Feb 2014 Location: gonabad Posts: 55 Rep Power: 12	can you help me about my second comment?