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boundry conditons
Posted 9 mars 2012, 11:00 UTC−5 Version 3.5a 0 Replies
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Please guide me.As I am new in COMSOL and have some confusions regarding boundry conditions.
1.I am using a chamber of dia 260mm x 150 mm (hight) inside the cavity I have a cylinder of dia 80mm x76mm (hight) at constant isothermal temprature.
2. I have considered 2-D axisymtric case.
3.I have big confusion on the top boundry of the chamber which is infact open boundry.
4.I am using general Heat transfer module with navier stokes
Questions:
1.What should be the boundry condition for the heat transfer module on the opening of the cavity
1. Temprature = ambient temprature?
2. heat flux ?
3.Convective flux?
(I have given the heat flux but bit confused about characteristic length mean its an open cavity if i considered heat flux its mean there is some solid wall or some wall boundry bit confused)
For navier stoke at the opening i Have given the open boundry , boundry condtion,
My model works well but velocity of the air is very very low mean in the range of e-20.
So please guide me whether is it alrite?? or I needed to change somthing.
I will be really thankful to you.
Tassawar
Hello Tassawar Hussain
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