non uniform boundary condition
 

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

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"?

tx for your attention
yea
i dont know about groovyBC

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?

Have a look at

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

and

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

can you help me about my second comment?