What's the meaning of 'INERT'?

lsl

unread,

Sep 11, 2010, 9:20:22 PM9/11/10

to FDS and Smokeview Discussions

Hi,
By default,the outer boundary of the domain is 'INERT' wich
maintained at ambient temperature.But,how fds compute heat transfer
at outer boundary,that is,what are thermal properties of 'INERT'?

dr_jfloyd

unread,

Sep 12, 2010, 10:02:12 AM9/12/10

to FDS and Smokeview Discussions

INERT = ambient temperature. There are no properties to the
material. It is a fixed temperature boundary.

Fredrik (Wuz)

unread,

Nov 8, 2010, 4:49:10 AM11/8/10

to FDS and Smokeview Discussions

To my understanding:

An INERT surface remains fixed at the ambient temperature. Heat
transfer does occur from gases to INERT surfaces.

But, does not the INERT surface need to have some kind of thermal
conductivity, density and heat capacity in order for FDS to calculate
the heat flux from gases to the INERT surface?

// Fredrik

dr_jfloyd

unread,

Nov 8, 2010, 7:21:41 AM11/8/10

to FDS and Smokeview Discussions

Why would it need a conductivity and density? The temperature is
fixed to ambient.

q_wall = q_conv+q_rad = h (T_gas - T_wall) + q_rad,in - emissivity
sigma T_wall^4

Fredrik (Wuz)

unread,

Nov 8, 2010, 8:26:28 AM11/8/10

to FDS and Smokeview Discussions

Naturally, I was too focused on the heating part of the wall. But,
that is of course irrelevant from this point of view... Thanks for
your reply...

Reply all

Reply to author

Forward