[Destouches]

Hi Foamers,

I have a small quizz for ya. Considering that I can do:
- a multiphase heat transfer using chtMultiRegionFoam (ie: liquid/liquid exchanger)
- a boiling simulation with reactingTwoPhaseEulerFoam
Is there a way to do BOTH at the same time ?

Put clearly, can OpenFOAM simulate hot pressurised water in a copper tube that will evaporate unpressurized water around it ?


Good evening everyone

[Tobi]

Hi,

that is not a quiz. Yes you will be able to do that with foam but not with the standard libraries and solvers. You have to program it yourself. Good luck for that topic.

[Destouches]

Hi Tobias,

Thank you for your answer, and for your overall contribution, it's somehow because of you that I'm fond of OF today.

I'll dig the question. The handtaylored solver for boiling simulation I found so far (here: https://www.youtube.com/watch?v=trZIxYIH7-0) seems to imply out of date code. Well, it's never easy.

Originally Posted by Tobi

that is not a quiz.

You're right, so I have another question
Is a fluid model plasma modelling also possible on OpenFOAM ?

Does it imply to manually write maxwell and transport equations in a custom solver ?
If so, is there a course somewhere that describe this kind of process ?


Cheers

[Tobi]

Hi,

actually I am doing the same development in my programming screen casts (with respect to the source given in the video » Chalmers). See 5.6 on my website (https://holzmann-cfd.de/training/ope...nd-programming). Actually the only difference is the adding of a passive transport equation for the temperature and add a temperature depended saturation pressure, e.g. a formulation given here https://en.wikipedia.org/wiki/Vapour_pressure_of_water.

However, some remarks to the video:

• Nice one however the run time is very small - maybe instability
• There are actually no real vapor cell because alpha is always > 0.7
• 2D in such a case is always a complex topic based on the pressure distribution

Well, but the simulation seems to work. I am just wondering if it would work if the temperature is higher and one will get real vapor. In my experience, the solver was very instable (but during that time I was a beginner in FOAM - with the development I made last year, I never did big tests). Well, thats another story.


To your other question. Plasma modeling is possible sure. One colleague in the chair I am working at is doing that (ANSYS). However, there should not be a problem to do the same stuff with FOAM. In addition another colleague is duing MHD. However, I cannot give you any advice which equations have to be modeled and taken into account for plasmas. If I remember correctly my colleague calculates free iones in the air and other things - complex modeling but the results look exciting <3.


If you need all the Maxwell equations, I don't know. Depend what your want to model. One thing to your first post. I would write a new solver that solves a CHT problem with 1 solid, 1 singlephase and 1 multiphase domain.


Good luck
Tobi

PS: Thanks for your words. I feel honored if you get used to FOAM based on my work. Actually, we should thank Bruno who is keeping the forum clear and also do a lot of work here as well as Bernhard for the wiki. Of course there are a lot of other guys who should be acknowledged. I took my time and did it now: Thanks to the people who are making this forum successful