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# Turbulence modeling

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1.
edited July 2012

Hi Staffan,

with respect to possible future development of the page:

I think the most effective would be to have just a general description of the main approaches and their differences (i.e. DNS, LES, RANS). I don't think it's worth the effort to go into too many details of e.g. RANS its different turbulence models (there are many) or e.g. DES. If people are really interested in this, they can read the referenced literature. I think the general scientist/engineer doesn't need such a detailed knowledge for understanding some background of CFD for appreciating climate models.

If you agree with such a point of view, I could assist in writing the page.

Comment Source:Hi Staffan, with respect to possible future development of the page: I think the most effective would be to have just a general description of the main approaches and their differences (i.e. DNS, LES, RANS). I don't think it's worth the effort to go into too many details of e.g. RANS its different turbulence models (there are many) or e.g. DES. If people are really interested in this, they can read the referenced literature. I think the general scientist/engineer doesn't need such a detailed knowledge for understanding some background of CFD for appreciating climate models. If you agree with such a point of view, I could assist in writing the page.
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2.
edited July 2012

That was my intention for adding the page. So i just wanted to keep track of common initiatives and have an survey table at the beginning of their properties and how they differ. See for example talk from NASA at one of the verification and validation workshops.

So tracking the joint effort initiated by NASA and supported by the fluid dynamics WG of AIAA (American Institute of Aeronautics and Astronautics) and others.

Comment Source:That was my intention for adding the page. So i just wanted to keep track of common initiatives and have an survey table at the beginning of their properties and how they differ. See for example talk from NASA at one of the [verification and validation workshops](http://turbmodels.larc.nasa.gov/TurbWG/Chicago-TurbTalk2.pdf). So tracking the joint effort initiated by NASA and supported by the fluid dynamics WG of AIAA (American Institute of Aeronautics and Astronautics) and others.
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3.

Hi Staffan,

thanks for replying. The NASA talk about verification and validation is interesting, but personally I would say it's far too technical (all those different RANS models) for the 'general engineer/scientist' -- though it may be good to include the main messages of the talk, ie that the same models on different codes don't always agree, and how people look on the future of RANS.

FYI: I'm working with LES -- as a tool, I don't study its differences wrt RANS as such, but I've read some background about the different approaches.

Comment Source:Hi Staffan, thanks for replying. The NASA talk about verification and validation is interesting, but personally I would say it's far too technical (all those different RANS models) for the 'general engineer/scientist' -- though it may be good to include the main messages of the talk, ie that the same models on different codes don't always agree, and how people look on the future of RANS. FYI: I'm working with LES -- as a tool, I don't study its differences wrt RANS as such, but I've read some background about the different approaches.
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4.
edited July 2012

Maybe to start the page one of you can answer these questions in a nontechnical way:

What the hell is RANS?

What the hell is LES?

Comment Source:Maybe to start the page one of you can answer these questions in a nontechnical way: What the hell is RANS? What the hell is LES? <img src = "http://math.ucr.edu/home/baez/emoticons/rolleyes.gif" alt = ""/>
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5.

Well, Tim van Beek has already written Large eddy simulation and Reynolds-averaged Navier-Stokes equations...

Comment Source:Well, Tim van Beek has already written [[Large eddy simulation]] and [[Reynolds-averaged Navier-Stokes equations]]...
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6.
edited July 2012

Okay, great. I'm too much of a dilettante to remember the acronyms in all the subjects I dabble in.

Comment Source:Okay, great. I'm too much of a dilettante to remember the acronyms in all the subjects I dabble in.
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7.

As I am retired due to neurological disease I am not allowed to do any more time than 1/8 of a full time (full time is 40 hours in Sweden). So Ill monitor Azimuth forum's as I am still so frustrated that absolutely nothing is done and Azimuth is always a good place to channel the feelings :-).

Comment Source:As I am retired due to neurological disease I am not allowed to do any more time than 1/8 of a full time (full time is 40 hours in Sweden). So Ill monitor Azimuth forum's as I am still so frustrated that absolutely nothing is done and Azimuth is always a good place to channel the feelings :-).