CFD Online Discussion Forums (https://www.cfd-online.com/Forums/)
-   OpenFOAM Running, Solving & CFD (https://www.cfd-online.com/Forums/openfoam-solving/)
-   -   Convective multi-region HT (MRconjugateHeatFoam) (https://www.cfd-online.com/Forums/openfoam-solving/116132-convective-multi-region-ht-mrconjugateheatfoam.html)

 Cameron April 13, 2013 15:32

Convective multi-region HT (MRconjugateHeatFoam)

Hey Foamers,

I am interested in a multi-region, heat transfer solver that works with forced convection (chtMultiRegionFoam, features fluid-solid interaction but only simulates natural convection).

Penn State's Dr. Craven and Dr. Campbell gave a really interesting talk at the 6th OF workshop titled "Multi-region Heat / Mass Transfer". In their presentation, they use and describe the solver MRconjugateHeatFoam.
http://www.personal.psu.edu/dab143/O...ven_slides.pdf

I booted up the 6th OF Workshop's distribution from the iso file, but I had no luck finding the solver. Does anyone have a recommendation on where to find it?

Other ideas for modelling the coupled HT of a fluid channel and the solid geometry encasing it would also be welcome!

-Cameron

 startingWithCFD April 15, 2013 04:59

Why do you claim/state/suppose that chtMultiRegionFoam deals only with natural convection?

 Cameron April 15, 2013 12:03

My assumption about chtMultiRegionFoam was based on different reports, tutorials, presentations, and forum posts I looked through last week. If it is incorrect, then please let me know!

In other news, I have found the conjugateHeatFoam solver (part of OpenFoam-1.6-ext), and I believe that it will suit my needs well.

 startingWithCFD April 15, 2013 12:31

So what is the difference in the equations between a forced convection and a natural convection solver? Is it not just the g-term? This can be deactivated in chtMultiRegionFoam.

If I am not mistaken, the difference between chtMultiRegionFoam and conjugateHeatFoam lies on other characteristics (in-/compressible, coupled/segregated and so on).

 fredo490 April 16, 2013 12:13

Nature convection is not easy to achieve ! Theoretically yes, you just put a term with g and you should get your result. However, I've never encounter any case that is going smoothly with this.

It is so problematic sometimes that OF has some dedicated solver for Nature Convection.

 startingWithCFD April 16, 2013 15:04

It is nice to know that Fredo, I have never been involved with natural convection. But here I meant that a natural convection solver could probably be easily converted to a forced convection solver, not the other way around. Also, this is just my hypothesis, I would not call myself an expert :-)

Quote:
 Originally Posted by Cameron (Post 420324) Hey Foamers, I am interested in a multi-region, heat transfer solver that works with forced convection (chtMultiRegionFoam, features fluid-solid interaction but only simulates natural convection). Penn State's Dr. Craven and Dr. Campbell gave a really interesting talk at the 6th OF workshop titled "Multi-region Heat / Mass Transfer". In their presentation, they use and describe the solver MRconjugateHeatFoam. http://www.personal.psu.edu/dab143/O...ven_slides.pdf I booted up the 6th OF Workshop's distribution from the iso file, but I had no luck finding the solver. Does anyone have a recommendation on where to find it? Other ideas for modelling the coupled HT of a fluid channel and the solid geometry encasing it would also be welcome! -Cameron

Hey Cameron,

In any case, to answer your original question, if you still need those files, the original link is this:

http://www.personal.psu.edu/dab143/OFW6/training.htm

Hopefully they will keep the link up for some time.

Regards,

 Cameron April 18, 2013 14:12

 Tobi November 28, 2013 07:47

Quote:
 Originally Posted by Cameron (Post 420324) Hey Foamers, I am interested in a multi-region, heat transfer solver that works with forced convection (chtMultiRegionFoam, features fluid-solid interaction but only simulates natural convection). Penn State's Dr. Craven and Dr. Campbell gave a really interesting talk at the 6th OF workshop titled "Multi-region Heat / Mass Transfer". In their presentation, they use and describe the solver MRconjugateHeatFoam. http://www.personal.psu.edu/dab143/O...ven_slides.pdf I booted up the 6th OF Workshop's distribution from the iso file, but I had no luck finding the solver. Does anyone have a recommendation on where to find it? Other ideas for modelling the coupled HT of a fluid channel and the solid geometry encasing it would also be welcome! -Cameron

Hi,

chtMultiRegion*Foam should be able to calculate forced convection - why should this solver not be able to do that?

In my opinion the natural convection compared with forced convection is very small so you "could" set g to (0 0 0) but that does not make sence in my opinion.

If you get forced convection you always can enable natural convection. It has no big influence but I think your calculating time would not be blow up if you use natrual convection too.

I have solved forced convection 4 years ago in my Bachelor Thesis with the chtMultiRegionSimpleFoam with very good Quality and quantity results (incompressible).

In your title you wrote: (MRconjugateHeatFoam) - so I am asking myself what is the difference:

chtMultiRegion = conjugated heat Transfer of Multi region
(MRconjugateHeatFoam) = Multi Region conjugate heat Transfer

:D

I have no idea which differences are made in that solver - compared to the Standard cht solver in openfoam.
Maybe it could solve compressible fluids too ... ? Do not know.

Maybe you have a better prediction of wall Treatments or stuff like that.
Hence you should compare the solvers but first I would use the official cht solver, make my Simulation and compare it with Literature or measurment data.

Regards Tobi

 Kumudu December 5, 2013 02:41

MRconjugateHeatFoam and chtMultiRegionFoam

[QUOTE=Tobi;463887]Hi,

In your title you wrote: (MRconjugateHeatFoam) - so I am asking myself what is the difference:

chtMultiRegion = conjugated heat Transfer of Multi region
(MRconjugateHeatFoam) = Multi Region conjugate heat Transfer

*****************************************
Hi,

I want to use MRconjugateHeatFoam. I think, it solves only the advection diffusion equation for fluid and diffusion equation for solid. Also, all the flid and solid properties are constant unlike the chtMultiRegionFoam.

The problem is it has defined only for two region, one for fluid and one for solid. However, chtMultiRegionFoam has the capability of using any number of regions. If you have used the MRconjugateHeatFoam to solve for more than two regions, please let me know how you change the code to add these new regions.

Thanks,
Kumudu:)

 All times are GMT -4. The time now is 13:02.