[duderino]

Hi!

Is in OpenFOAM a solver for multiphase flow with more than 2 phases (with phasechange/cavitation)?

Best regards duderino

[henry]

Not yet.

[duderino]

Hi Henry

What does this mean? Are there any plans to do this?

Best regards duderino

[henry]

There are current plans to implement incompressible multiphase flow with interface capturing/VOF. We are seeking sponsorship for compressible multiphase flow which is a prerequisite for multiphase flow with cavitation.

Hello,

Is in OpenFOAM a solver for compressible multiphase (water/air) flows?

Regards,
Nicoleta

[billy]

multiphaseInterFoam. Release 1.4

[hsieh]

Hi,

Based on my understanding, the two-phase solver (interFoam, air/water) is incompressible.

MultiPhaseInterFoam handles air + more than two liquids (i.e., air/water/oil).

Pei

[mplongjr]

Hi all,
I've been trying to get a 3-species model running in multiphaseInterFoam (air+liquid1+liquid2) and it is behaving strangely. I have all of the alphas set up correctly (they show up in paraFoam correctly anyway). The model is simple with an inlet port for each liquid and a fixed pressure outlet at the far end of the fluid domain. The entire fluid domain is initially air and I am setting a fixed velocity for each fluid phase entering the domain. The case begins to run and I can see each phase beginning to move through the domain, but it crashes after a short time.

When I look at the results in paraFoam, the pressure (pd) is small throughout the domain accept in the inlet for the first liquid phase, where it is much higher. I've tried changing the transport properties for all three phases and it still wants the pressure in the first liquid phase to be very high, even when I switch the properties with the second phase.

Is there any way to verify that the transport properties for each phase are being used in the solution?

[hsieh]

Hi,

If you have all air in the domain, then, based on my past experience, run might crash. What I usually do is extend the inlet outwards, and then, initialize the extended portion with liquid. This seems to stabilize the run.

Pei

[mplongjr]

Hi Pei.. thanks for the suggestion. I tried to initialize both of the liquid inlets and it seemed to help things along but it would still sigFpe after a short while. I spent a couple of days trying out different settings and looking through posts for interFoam. I settled on using the original PCG solver from the interFoam tutorials (for pressure) as well as using upwind for the alpha terms and it is acting much more stable. The results look strange to me though, especially the way that the liquid phase entering one of the inlet ports seems to be deformed significantly by the gas phase, while the other liquid phase is not.



The transport properties that I'm using are:

Gas Phase (red)
nu [0 2 -1 0 0 0 0] 1.8e-05;
rho [1 -3 0 0 0 0 0] 1.22;

Liquid Phase 1 (blue)
nu [0 2 -1 0 0 0 0] 1.6e-06;
rho [1 -3 0 0 0 0 0] 800.0;

Liquid Phase 2 (green)
nu [0 2 -1 0 0 0 0] 2.5e-07;
rho [1 -3 0 0 0 0 0] 1140.0;

I realize that the second liquid phase is significantly more dense than the first but would not expect it to interact so much with a fluid that is 650 times less dense.

Any ideas?

Mike

[hsieh]

Hi, Mike,

multiPhaseFoam does not have MULES implemented. Standard interFOAM has MULES which ensures boundness.

If you can email me the case, then, I might take a look at it when I have the chance. I only have some experience with multiPhaseFoam and this is quite a while ago.

Pei

[mplongjr]

hmmm.. I just tried to run the damBreak4phaseFine case and it crashes when I run it in parallel, but runs fine on a single processor. I'm going to try to run my case with the original settings on one processor (it's going to take a few days!).

Have you run that tutorial in parallel successfully?

[hsieh]

Hi, Mike,

You were correct. Parallel run failed after few time steps. You should report this as a bug.

Pei

[hsieh]

Hi, Mike,

Just curious, which OpenFOAM version are you using?

Even the serial run, damBreak4PhaseFine in OF-1.4.1 tutorial failed on me, while, OF-1.4 has no problem.

Pei

[mplongjr]

You are also correct... with 1.4 (compiled with gcc 4.2.0) the damBreak4PhaseFine tutorial runs OK. It only seems to be broken in 1.4.1 (compiled with gcc 4.2.1).

I'm going to have to play around with it some more...

[msrinath80]

Hi there,

The bug report was filed and Henry has promptly explained what's happening and how to overcome the problem. Please check the following link:

http://www.cfd-online.com/OpenFOAM_D...tml?1189975304

[mplongjr]

Any update on Henry's proposed improvements to multiphaseInterFoam?.. i.e.. MULES

also..

I've been using lesInterFoam with some success designing a simple liquid/liquid mixer ejecting into air, but I'd like to do the same with two different density streams... of course that would mean something like lesMultiphaseInterFoam.. did I name that right?.. ;)

Mike

[virginie_e]

Hello,

I am a new user of OpenFOAM and I would like to use the solver multiphaseInterFoam to simulate a three-phase surface free flow.

Could you please give me some references (if there are any) on the algorithm used in the solver in OpenFOAM 1.5?

Thank you!

Virginie

[virginie_e]

Hello,

I am a new user of OpenFOAM and I would like to use the solver multiphaseInterFoam to simulate a three-phase surface free flow.

Could you please give me some references (if there are any) on the algorithm used in the solver in OpenFOAM 1.5?

Thank you!

Virginie

[chiven]

Dear Henry and other experts of multi-phase flow, would you please give a comment on my problem shown in
http://www.cfd-online.com/Forums/ope...lculation.html
I think the issue is interesting, but a little difficult.
Thank you very much.
Best regards,
Chiven