[farzadpolytechnic]

hi foamers
for my MSc thesis i work with openFOAM . i want to simulate air bubble flow with driftFluxFoam and mixture approache. but as i know this solver use non-Newtonian fluid for second phase in transport properties, and we know that the air bubble's are Newtonian.
when i use Newtonian method instead of binghamPlastic(default of driftFluxFoam in openFoam 4.0) i recive this error:
PIMPLE: Operating solver in PISO mode

Reading field p_rgh

Reading field U

Reading/calculating face flux field phi

Reading incompressibleTwoPhaseInteractingMixture

Selecting incompressible transport model transportModel


--> FOAM FATAL ERROR:
Unknown mixtureViscosityModel type transportModel

Valid mixtureViscosityModels are :

3
(
BinghamPlastic
plastic
slurry
)


From function static Foam::autoPtr<Foam::mixtureViscosityModel> Foam::mixtureViscosityModel::New(const Foam::word&, const Foam::dictionary&, const volVectorField&, const surfaceScalarField&)
in file mixtureViscosityModel/mixtureViscosityModelNew.C at line 49.

FOAM exiting



so please help me how can i solve this problem?
is there any way for use both phase as Newtonian?

[decah]

Hi Farzad

I think interFoam or twoPhaseEulerFoam would be more appropriate solvers for your problem. The drift flux model equations are solved for a two-phase mixture where the two phases are considered to be interpenetrating, i.e. the continuous and dispersed phases are both defined at every point.

If you still want to use driftFluxFoam, I would say select the default Bingham viscosity model and then in transportProperties:

BinghamCoeff  0; //sets the yield stress to 0
...
muMax  1.8e-6; //viscosity of air at 20 deg

This should make the mixture viscosity quasi-Newtonian

[farzadpolytechnic]

hi dear declan
thank you for your quick answer
my modeling is in two-phase mixture approach, so i have to work with this solver
i change the binghamCoeff and mu Max as you said, but it still don't get correct answer
do you know about the other coefficient in transport properties file? do you have some text our any source that explain about this coefficient?
best regard
farzad

[cfdsolver1]

I think you can do that by adding new transport model to solver and compiling it. As an alternative, I think it might be possible to add the needed model into your controlDict file. Both examples are available in the forum as I remember.

[decah]

Hi Farzad

The other coefficients are for calculating the plastic yield stress (which would be zero for a Newtonian fluid) and the plastic viscosity (which you want to be a linear function of strain rate for a Newtonian fluid). You could try the Chalmers report by Naser Hamedi for some more info.

The twoPhaseEulerFoam solver also employs a mixture approach and will allow you to select Newtonian viscosity more easily. driftFluxFoam assumes one phase moves relative to the other at a constant slip velocity like solid particles settling out of water under gravity.

[farzadpolytechnic]

thank you cfdsolver1
do you remember the title of the topic or do you have its link?

[cfdsolver1]

Originally Posted by farzadpolytechnic

thank you cfdsolver1
do you remember the title of the topic or do you have its link?

I think you can compile new model as in this thread: How creating new thermo physical model

and adding it to controlDict file should be similar like this: How to add a new Equation of State

[farzadpolytechnic]

dear declan
it is really helpful for me.thank you a lot
twoPhaseEulerFoam solve problem in Eulerian-Eulerian method which both phase are Newtonian fluid. i use this solver before.know i want to compare the result with mixture method.
my case is bubble plume and i want to simulate air bubble flow. free surface and bubble coalescence and break up doesn't care for my case

[Bashar]

Hi, Farzad

I am also interested in using driftFlux for two Newtonian fluid. Did you have any information about these kind of applications.

[Mousa.h]

Originally Posted by Bashar

Hi, Farzad

I am also interested in using driftFlux for two Newtonian fluid. Did you have any information about these kind of applications.

Hi Bashar

Has your problem resolved with the driftFluxFoam?

[drissjbira]

please i want to understand everething about this Solver(DriftFluxFoam)
if anyone have an idea or a book
please help me
thanks

[rsamstag]

Originally Posted by drissjbira

please i want to understand everething about this Solver(DriftFluxFoam)
if anyone have an idea or a book
please help me
thanks

There aren't any good tutorials for driftFluxFoam to my knowledge besides Brennan's thesis: powerlab.fsb.hr/ped/kturbo/OpenFOAM/docs/DanielBrennanPhD.pdf. Cheers, Randal

[nepomnyi]

Originally Posted by rsamstag

There aren't any good tutorials for driftFluxFoam to my knowledge besides Brennan's thesis: powerlab.fsb.hr/ped/kturbo/OpenFOAM/docs/DanielBrennanPhD.pdf. Cheers, Randal

Hello Randal, thank you for the suggestion because it is frustrating not been able to find a manual for the drift flux model.
The link you provided is broken. It appears to be difficult to manually find the dissertation on the Internet with the information you gave.
I'm wondering if you can be so kind to give more information on the thesis. Such as (but not limited to), the name of the dissertation, university where Danial Brennan studied and the d.o.i of the publication.

Thank you in advance.
Ivan

[nepomnyi]

Originally Posted by nepomnyi

Hello Randal, thank you for the suggestion because it is frustrating not been able to find a manual for the drift flux model.
The link you provided is broken. It appears to be difficult to manually find the dissertation on the Internet with the information you gave.
I'm wondering if you can be so kind to give more information on the thesis. Such as (but not limited to), the name of the dissertation, university where Danial Brennan studied and the d.o.i of the publication.

Thank you in advance.
Ivan

I guess, I've found it.

Here's one link, here's another one to Google books.
I can't seem to find d.o.i. Here is the full name of the dissertation. Daniel Brennan, The numerical simulation of two-phase flows in settling tanks, January 2001. Thesis submitted for the degree of Doctor of Philosophy of the University of London. Imperial college of science, technology of medicine, department of mechanical engineering, Exhibition road, London, SW7 2BX.


The dissertation is from 2001. I doubt it provides all the details of the OpenFOAM implementation of the drift-flux model.


Ivan