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Old   October 16, 2001, 05:17
Default air conditioning in cars
  #1
Tadiwos
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Hello CFX Friends,

I want to model air conditioning inside a small BMW car. I have two questions:

1) How much detail should I make the geometry using CFX Build? It is difficult for me to represent everything inside the car i.e, the seats, wheel drive, brakes.....

2) Is it two dimensional or three dimensional flow should I use?, I would like to get good validation results interms of temperature.

3) Is there any one who is working on such kind of research. if there is please post your address and I will try to contact you.

Thank you very much for your help.

CFX researcher

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Old   October 16, 2001, 07:14
Default Re: air conditioning in cars
  #2
Herve
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Why don't you get a CAD file from your client? You can import nice CAD surfaces into Build and therefore easily include dashboard, seats windows etc...
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Old   October 16, 2001, 07:26
Default Re: air conditioning in cars
  #3
Tadiwos
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Herve, thanks for your suggestion, but what do you mean by client? Do you mean the BMW manufacturer?

Tadiwos
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Old   October 16, 2001, 08:18
Default Re: air conditioning in cars
  #4
Herve
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I meant if you have been asked to carry out such work on a specific car, the person requiring the work might have the CAD file from which you can start (do an import in Build).

If not,and you are carrying the job for yourself you can implement a general shape for the cockpit and the seats in the cockpit directly in Build, bearing in mind what is important for your model (e.g. you won't need all the intricate shapes of the seat to be included) or look for any CAD file on the net from companies such as www.rhino3d.com for example.
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Old   October 16, 2001, 15:25
Default Re: air conditioning in cars
  #5
John C. Chien
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(1). I would suggest that you start with a simple 3-D model,with a 2-D cross-section first. (using the car symmetry plane cross-sectional shape) (2). If you can't do simple 3-D, then it is hopeless.
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Old   October 17, 2001, 03:48
Default Re: air conditioning in cars
  #6
Fabian
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Herwig,H.; Klemp,K.; Schmücker,A.; Currle,J.: "Ventilation of passenger car cabins: Comparison of experimental and numerical data" Forschung im Ingenieurwesen - Engineering Research, Bd. 62, 161-167, 1996
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Old   October 17, 2001, 04:08
Default Re: air conditioning in cars
  #7
Tadiwos
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Thanks guys

Fabian, can you please tell me where I can find the reference that you pointed out?

Tanks
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Old   October 17, 2001, 04:32
Default Re: air conditioning in cars
  #8
Fabian
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http://link.springer.de/link/service...0010/index.htm
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Old   October 17, 2001, 04:44
Default Re: air conditioning in cars
  #9
Joern Beilke
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To get some impression you could look at

http://www.adapco-online.com/

under Examples --> Passenger Compartment

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Old   October 18, 2001, 05:11
Default Re: air conditioning in cars
  #10
Jon
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Then again, you could look at the comments made under 'compare CFX5 and Star-CD' and realise that you'd be better off sticking with CFX5.
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Old   October 18, 2001, 08:43
Default Re: air conditioning in cars
  #11
Joern Beilke
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good joke

but ist not important which tool you use but how you use it. So even that example might help to get an impression whats usually done in this area of cfd.

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Old   October 18, 2001, 09:31
Default Re: air conditioning in cars
  #12
Jon
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Who's joking?

3
:0-

3

So why didn't you pass them on to the cfx website, as this is the cfx forum?

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Old   October 18, 2001, 11:26
Default Re: air conditioning in cars
  #13
Joern Beilke
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I'd love to switch to CFX if it would be that superior but it is simply not powerful enough.

If you look at the examples on my home-page you will know why. It is some very simple moving mesh stuff -- nothing special and several years old.

Once CFX can handle this kind of problems we can go on talking.

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Old   October 18, 2001, 11:52
Default Re: air conditioning in cars
  #14
Jon
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It can, I believe.
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Old   October 18, 2001, 13:04
Default Re: air conditioning in cars
  #15
Joern Beilke
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Science is not a good place to "believe" something. Either you know it or not.
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Old   October 18, 2001, 13:14
Default Re: air conditioning in cars
  #16
John C. Chien
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(1). I am getting the message that many people in CFD are very confused that they tend to think that computer codes are their gods. (2). I think, I like your message, because you are not the one who is confused.
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