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#1 |
New Member
wind
Join Date: Feb 2012
Posts: 16
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Hi, I would like to model upper room uvc system. I found out that most of the work done is using fluent DO radiation model. It is possible to model it using cfx monte carlo model ? Anyone know how to set the radiation model using cfx? Thanks
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#2 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
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I have no idea what an "upper room uvc" system is.
CFX has several radiation models, including a Monte Carlo model. Have a look in the documentation and tutorials for how to use it.
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#3 |
New Member
wind
Join Date: Feb 2012
Posts: 16
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Hi,ghorrocks thank you for your reply. Upper room uvgi, the the uv light device mounted above the head level in the room for disinfection. From the literature, I have saw that people are using the fluent DO radiation model but cfx doesn’t have the DO radiation model and there is lacking of documents for UV modeling using CFX. May I know anyone have experience model uv using cfx?
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#4 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
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The Discrete Ordinates radiation model in Fluent looks like the Discrete Transfer model in CFX. Have a look to see if that does what you want.
UV light is just a band of the electromagnetic spectrum. The radiation models in CFX are designed to handle the entire electromagnetic spectrum. So the models in CFX should be able to handle it, and experience in modelling any other part of the EM spectrum will be useful as you model in the UV part of the spectrum.
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#5 | |
New Member
wind
Join Date: Feb 2012
Posts: 16
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Quote:
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#6 |
Senior Member
Gert-Jan
Join Date: Oct 2012
Location: Europe
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If you find a decent and validated way to calculate the UV intensity in 3D using the Discrete Transfer method, I would also be interested. I never managed to obtain reliable results.
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#7 |
New Member
wind
Join Date: Feb 2012
Posts: 16
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Hi, Gert-Jan, yes it happened to me also. I just found that CFX Discrete Transfer method can not model directional radiation flux.
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#8 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
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I thought the entire point of the discrete transfer model was to model directional radiation flux. I do not use radiation modelling much, but every time I did was with the discrete transfer model and I did a validation and it gave me good results.
Don't forget it is a tunable model, like mesh size, convergence tolerance and time step size. You need to adjust it to get it accurate enough but not too big as to make the simulation too big. The main parameter to tune was the number of rays to trace or something like that (it has been a while).
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#9 | |
Senior Member
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Quote:
The directional Flux feature is for collimated beams, not for isotropic lamps.
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#10 |
Senior Member
Gert-Jan
Join Date: Oct 2012
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My customer has quartz tubes with a plasma inside. So no laser. Probably a diffuse lamp. For the geometry of interest, they provide an intensity in x,y,z-table format that I import. Works pretty well.
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Tags |
uvc |
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