COMSOL 4: "Reradiating Surface"

Topics: 4.0, Heat Transfer, 4.0a, 4.1

Thread index  |  Previous thread  |  Next thread  |  Start a new discussion

RSS FeedRSS feed   |   Email notificationsTurn on email notifications   |   3 Replies   Last post: December 8, 2010 12:28pm UTC
Kai Herbrig

Kai Herbrig

December 7, 2010 11:07am UTC

COMSOL 4: "Reradiating Surface"

Hi there,

I'm interested about new features of COMSOL 4.

Especially I would like to know what the "Reradiating Surface" boundary condition is, which is avaivible in the heat Transfer Module. Is it a diffusive reflector?

I'm using 3.5a and there is no such feature.

kind regards

Reply  |  Reply with Quote  |  Send private message  |  Report Abuse

Ivar Kjelberg

Ivar Kjelberg

December 7, 2010 3:43pm UTC in response to Kai Herbrig

Re: COMSOL 4: "Reradiating Surface"

Hi

if you take the HT user guide V4.1 on p89 you will read

The Reradiating Surface feature is a variant of the surface-to-surface radiation feature
with e = 0. Reradiation surfaces are common as an approximation of a surface that is
well insulated on one side and for which convection effects can be neglected on the
opposite (radiating) side.
It resembles a mirror that absorbs all irradiation and then
radiates it back in all directions: J = G. The feature adds the radiosity dependent
variable to its selection and uses it as surface radiosity.

Heat flux on surface-to-surface boundary is zero:

.....

--
Good luck
Ivar

Reply  |  Reply with Quote  |  Send private message  |  Report Abuse

Kai Herbrig

Kai Herbrig

December 8, 2010 10:09am UTC in response to Ivar Kjelberg

Re: COMSOL 4: "Reradiating Surface"

Hi Ivar,

if I had Comsol 4.1, then I would take the HT user guide and then I would read on page 89 " .... " but ... I haven't ;)

So thanks (again). I expected that this boundray condition would work like this.


Best regards

Reply  |  Reply with Quote  |  Send private message  |  Report Abuse

Ivar Kjelberg

Ivar Kjelberg

December 8, 2010 12:28pm UTC in response to Kai Herbrig

Re: COMSOL 4: "Reradiating Surface"

Hi

well then you have part of the page on my previous post. You should get in contact with your local rep or xou COMSOl administrator to get access to latest 4.1 as ist much better documented and more stable than the first 4.0a even.

Another way is to search on the web ...

--
Good luck
Ivar

Reply  |  Reply with Quote  |  Send private message  |  Report Abuse


Rules and guidelines