parallel processing for Monte Carlo radiation possible ?

Malorie · June 10, 2009, 11:24

Hi everybody,

Does CFX allow parallel processing for a Monte Carlo radiation model ? I'm not sure.

Perhaps I have to do a simulation of natural ventilation of a very large atrium (roughly 60 000 m3, 35m height) with strange, complex, without symetry shape and lots of glazing with solar radiation.

Thanks

ckleanth · June 10, 2009, 12:34

couldn't you try to do a parallel model run using monte carlo and perhaps the rest of the physics you intend to use but using a small mesh?

ghorrocks · June 10, 2009, 20:23

Hi,

Do you need the Monte Carlo method? Would Discrete transfer be enough? It is much faster computationally.

Glenn Horrocks

Malorie · June 11, 2009, 03:23

Yes, I need Monte Carlo method because the medium is air and I have directed radiation (sun) to model.
But can I use Discrete transfer ? I've never used it for simulations in air.

And, just in theory, can I use Monte carlo in parallel processing ? It seems to me I read somewhere that it is not possible but I don't refind the paper.

ghorrocks · June 11, 2009, 07:55

Hi,

You might be able to do this with the Discrete Transfer model. Not sure if you can set a directional radiation BC you will need for the sun or whether that needs Monte Carlo. But definitely check the Discrete transfer model out as it is much faster than MC.

Not sure if MC works in parallel. Read the documentation.

Glenn Horrocks

June 10, 2009, 11:24	parallel processing for Monte Carlo radiation possible ?	#1
Malorie New Member Malorie Join Date: Jun 2009 Location: France Posts: 2 Rep Power: 0	Hi everybody, Does CFX allow parallel processing for a Monte Carlo radiation model ? I'm not sure. Perhaps I have to do a simulation of natural ventilation of a very large atrium (roughly 60 000 m3, 35m height) with strange, complex, without symetry shape and lots of glazing with solar radiation. Thanks

June 10, 2009, 12:34		#2
ckleanth Senior Member George Join Date: Mar 2009 Location: Birmingham, UK Posts: 257 Rep Power: 18	couldn't you try to do a parallel model run using monte carlo and perhaps the rest of the physics you intend to use but using a small mesh? __________________ Top 4 tips 1. Knowledge is everything and Ignorance is dangerous. 2. Understand your limitations and try to eliminate them. 3. Get yerself a bike and hoon the chuffer. You will soon learn why dogs like to hang their heads out the car window. 4. Please before asking any questions on how to run simulations in CFX, go though all the tutorials

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June 10, 2009, 20:23		#3
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,854 Rep Power: 144	Hi, Do you need the Monte Carlo method? Would Discrete transfer be enough? It is much faster computationally. Glenn Horrocks

June 11, 2009, 03:23		#4
Malorie New Member Malorie Join Date: Jun 2009 Location: France Posts: 2 Rep Power: 0	Yes, I need Monte Carlo method because the medium is air and I have directed radiation (sun) to model. But can I use Discrete transfer ? I've never used it for simulations in air. And, just in theory, can I use Monte carlo in parallel processing ? It seems to me I read somewhere that it is not possible but I don't refind the paper.

June 11, 2009, 07:55		#5
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,854 Rep Power: 144	Hi, You might be able to do this with the Discrete Transfer model. Not sure if you can set a directional radiation BC you will need for the sun or whether that needs Monte Carlo. But definitely check the Discrete transfer model out as it is much faster than MC. Not sure if MC works in parallel. Read the documentation. Glenn Horrocks