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-   -   steam release to atmosphere (http://www.cfd-online.com/Forums/openfoam-solving/110665-steam-release-atmosphere.html)

racime December 17, 2012 15:00

steam release to atmosphere
 
Hi,

I'm new in openfoam just installed it on my machine for a calculation on a thesis i am writing.

Looking through the several questions on the internet and this forum shows no light on my problem.

I want to model the release of steam into the atmosphere (calculate temperature gradient and distance). I was thinking to create a simplification of the reality by creating a nozzle blowing steam into a "room" the "room" is te outer atmosphere so about 50x30x30m (LxWxH).
Is this an approach that is correct to get some trustworthy results and what solver is adviced for this in openfoam?

racime December 19, 2012 01:09

Any tips on this issue? If the question is unclear i can try to elaborate this.:)

That's a pitty, no one having any idea to get me on the right track?

racime January 1, 2013 11:07

It's a new year so i try again :)

still not having found a solution to this problem and not having a clue how to use open foam for this issue.

Anyone that can lend a helping hand?

I want to model the release of steam into the atmosphere (calculate temperature gradient and distance). I was thinking to create a simplification of the reality by creating a nozzle blowing steam into a "room" the "room" is te outer atmosphere so about 50x30x30m (LxWxH).
Is this an approach that is correct to get some trustworthy results and what solver is adviced for this in openfoam?

Traib January 1, 2013 11:48

Quote:

Originally Posted by racime (Post 397983)
I want to model the release of steam into the atmosphere (calculate temperature gradient and distance). I was thinking to create a simplification of the reality by creating a nozzle blowing steam into a "room"

Hi racime,

I am not very clear about your case yet but I think your approach is definitely correct though you might want to be sure about the size of the room depending on your case, speed, nozzle diameter, etc. I am guessing your calculations are going to be steady state??? In that case you can try rhoSimpleFoam solver. If I am wrong about steady state solution then rhoCentralFoam should be a good start, however if shock waves are involved use sonicFoam.

I suggest you check the OpenFOAM User Guide for necessary information about how to use OpenFOAM, and for source codes you can go here: http://www.openfoam.org/docs/cpp/ .

Regards,
Traib

racime January 2, 2013 10:36

Thank you for your reply. I will check the link you presented and follow your tip on the module to use. Sure i will be back for more problems however
;)

mlubej January 2, 2013 15:20

Hello racime,

If I understand correctly, you want to simulate a steam/water distribution at the contact of steam with the atmosphere. I would recommend the buoyantPimpleFoam solver as a starter, since it already takes gravity/buoyancy into account. The contribution of velocity due to lower density of hot steam is surely not to neglect in this case.

There is another contribution of heat that is not considered in the stock solver. That is the energy released due to condensation of steam. For you to consider this, you will have to upgrade the buoyantPimpleFoam solver with the heat release at the exact temperature (condensation of steam, cca. 100 degC). I have been working on this upgrade for a while now, but in a different aspect - boiling heat exchanger.

I will let you know if i succeed with the upgrade of buoyantPimpleFoam solver with heat source at exact temperature.

Regards

racime January 3, 2013 14:32

Thank you for your explanation.
You would advice "buoyantPimpleFoam" solver for this case.
Upgrading it with the release rates (my steam is superheated 500 deg C and 70 Bar). but i calculated and found some values earlier.

I am now looking into some tutorial for OpenFoam to get an idea on how to use the data and implement it in the solver. First i will need to find a way to create a correct model of my situatuation this in Open Foam.:cool:

I would love to hear from you on your progress.

racime January 7, 2013 14:57

1 Attachment(s)
So and now on how to proceed. I made a simulation with the standard "hotroom" model in OpenFoam i implemented my own values in the model. But how to proceed on simulation a flow from a pipe? I have an STL model that i want to use, but i have no idea on how to implement this into the model.

How do i input a model like attached.
I see how to input the cube but how to attach the nozzle and how to indicate the blow from this nozzle? PErhaps a stupid question but i find the manual a bit unclear on this subject.

fahrudin February 20, 2013 19:28

Hi racime,
I hope you get the answer of above question.
and would you please share to me the result.
but sorry i not have the CFD software, I just want to know the basis of calculation.
I have same as your question in my plant. now we consider how much the steam would be rain-out and how about temperature and distance of rain-out (liquid droplet). this are consider the access route nearby the silencer.

I would love to waiting from your kind sharing.

Fahrudin

racime February 21, 2013 01:51

As for now i have problems setting up the model for this in OpenFoam. I never worked with the program before and find i hard to get started with a model.

I asked for some tips on the modeling because i am not sure on how to create a working model in open foam without getting an error. Unfortunately i did not receive tips. :(


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