[BabakArash]

Hi everybody,

Actually, I am doing my research in Environmental engineering but in my research, I am using COMSOL to model heat/mass transfer and air flow around a cylindrical object. Unfortunately, my advisor does not have any experience in CFD modeling at all. That is why I am here and hopefully I can get valuable advice on my questions.

Right now, I am trying to see if I can use use the predictive equations, which have been reviewed in a famous paper of 1978 Reynolds " The prediction of turbulent prandtl and Schmidt number" to determine turbulent Schmidt number as a function of Reynolds number.

it seems that it is scientifically reasonable to use predictive equations of this paper from which I have found a few possible relations to use for my simulations. However, I am not 100 sure whether or not what I am planning to do is correct.


Any thought or advice on that?



PS- Air flow in my simulation is turbulent. I am planning to increase the velocity, which will increase the turbulence intensity subsequently, that will I think result in a different Schmidt number for a new increased velocity.

[FMDenaro]

Just an advice. If your advisor has not experience on the topic, try to be independent and keen to know your research. Look in the relevant research journals and books, there a lot of researches after the 1978...

[BabakArash]

Originally Posted by FMDenaro

Just an advice. If your advisor has not experience on the topic, try to be independent and keen to know your research. Look in the relevant research journals and books, there a lot of researches after the 1978...

Thanks Filippo,

I totally agree with you on this and I have been doing my research independently since I noticed that my advisor could not provide me with the advice any graduate student needs.

Regarding my questions, I have been doing a comprehensive literature review and I have noticed the paper that I mentioned in my previous post, is like a cornerstone regarding turbulent Sc and Pr number. I can use a few of the existing relations regarding that BUT my advisor needs someone else's approval on accuracy of using such relations. He needs me show him CFD people think that this kind of application can have a scientific basis.

[FMDenaro]

Originally Posted by BabakArash

Thanks Filippo,

I totally agree with you on this and I have been doing my research independently since I noticed that my advisor could not provide me with the advice any graduate student needs.

Regarding my questions, I have been doing a comprehensive literature review and I have noticed the paper that I mentioned in my previous post, is like a cornerstone regarding turbulent Sc and Pr number. I can use a few of the existing relations regarding that BUT my advisor needs someone else's approval on accuracy of using such relations. He needs me show him CFD people think that this kind of application can have a scientific basis.

The concept of turbulent Pr and Sc numbers is not strictly a CFD topic but has more to do with the fundamental of turbulence. Hystorically they are introduced in the framework of Reynolds averaging apporach to the equations (see https://mitpress.mit.edu/books/first-course-turbulence).
Then, the RANS equations had large application in CFD and you can find the use of Pr_t and Sc_t in several codes (for example http://www.afs.enea.it/project/neptu...th/node128.htm).
I suggest also to check for similar question in this forum