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Viscoelastic Fluid Flows using OpenFOAM The solver viscoelasticFluidFoam

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Old   July 22, 2013, 03:33
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  #261
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Sita Drost
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Thanks, that seems to help!
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Old   July 22, 2013, 03:51
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Quote:
Originally Posted by Raymond.Leoi View Post
In terms of an example of Verbeeten's data as shown in the attached snapshot, how to get the viscoelastic models' parameters such as etaS, etaP etc.?
Dear Raymond,

etaP = G*lambda = given in the table
etaS = solvent viscosity, you don't need that for a melt (the data in the table is for an LDPE melt). If you still need some value, you could try zero or some very small value.
Everything else you need is given in the table, it seems.

Good luck,
Sita
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Old   July 22, 2013, 07:34
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I see, Sita. Many thanks.
Quote:
Originally Posted by sita View Post
Dear Raymond,

etaP = G*lambda = given in the table
etaS = solvent viscosity, you don't need that for a melt (the data in the table is for an LDPE melt). If you still need some value, you could try zero or some very small value.
Everything else you need is given in the table, it seems.

Good luck,
Sita
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Old   July 23, 2013, 16:48
Default viscoelasticInterFoam
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Hi Jovani
I'm master student and for my thesis I need viscoelasticInterFoam solver, If you can help me I'm so glad,
mohammadreza
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Old   July 23, 2013, 21:18
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Hi, Sita:
The parameters which can get like you say are important to me, too. Thank you for your explain in details.


salame

Quote:
Originally Posted by sita View Post
Dear Raymond,

etaP = G*lambda = given in the table
etaS = solvent viscosity, you don't need that for a melt (the data in the table is for an LDPE melt). If you still need some value, you could try zero or some very small value.
Everything else you need is given in the table, it seems.

Good luck,
Sita
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Old   July 24, 2013, 19:39
Unhappy About the N1
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i am interested in the viscoelasticFluid. But i feel uncerain about the N1, PSD and so on. ( N1=σ11-σ22) .
Like: If the N1 is greater , is that means the elastic characteristic of the poly melt powerfuler? Can someone help me clearly know the question? Or recommand any books or journals about these issues.
Best regards!
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Old   July 28, 2013, 15:36
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Hi friend,
can anyone help me to find viscoelasticInterFoam solver to simulate free surface problem?
thanks alot,
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Old   July 29, 2013, 01:52
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Quote:
Originally Posted by mohamadreza89 View Post
Hi friend,
can anyone help me to find viscoelasticInterFoam solver to simulate free surface problem?
thanks alot,
Dear Mohamad,

I think the viscoelasticInterFoam solver is not available for everyone yet. Last thing I heard was that Jovani was still working on it. Maybe you could contact him personally?

Best,
Sita
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Old   July 29, 2013, 11:06
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There are four modes for the default PTT-Exponential. If only one mode is concerned, how to disable the rest higher modes?
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Old   August 13, 2013, 14:46
Exclamation icofoam nu , viscoelasticfluidfoam rho
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ali jafari
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hi
I solved a problem for Newtonian and decided to compared it with viscoelastic
so I need similar properties such as viscosity and density. in other hand B.Cs for P are cyclic.

is nu(newtonian.icoFoam)=(etaS+etaP)/rho(visco.) ? I think , these are not equal !!!

whats your idea ?
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Old   August 13, 2013, 15:52
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Quote:
Originally Posted by ali jafari View Post
hi
I solved a problem for Newtonian and decided to compared it with viscoelastic
so I need similar properties such as viscosity and density. in other hand B.Cs for P are cyclic.

is nu(newtonian.icoFoam)=(etaS+etaP)/rho(visco.) ? I think , these are not equal !!!

whats your idea ?
Hi dear ali
In viscoelastic fluid, the summation of solvent and polymer viscisity is total viscosity that should be concider to calculate Re Number.
in netonian case, lambda should be near to zero. I suggest to set 10e-08 for this .
Best
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Old   August 14, 2013, 06:20
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Quote:
Originally Posted by desert_1250 View Post
Hi dear ali
In viscoelastic fluid, the summation of solvent and polymer viscisity is total viscosity that should be concider to calculate Re Number.
in netonian case, lambda should be near to zero. I suggest to set 10e-08 for this .
Best
thanks for useful and quick reply.
I want to know too , what should be I do for modeling a fluid properties that applied in icoFoam by viscoelasticfluidfoam .(specially about density nu(newtonian.icoFoam)=(etaS+etaP)/rho(visco.) !!!)
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Old   August 14, 2013, 06:51
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Quote:
Originally Posted by ali jafari View Post
thanks for useful and quick reply.
I want to know too , what should be I do for modeling a fluid properties that applied in icoFoam by viscoelasticfluidfoam .(specially about density nu(newtonian.icoFoam)=(etaS+etaP)/rho(visco.) !!!)


Hi again
i hopethat get your mean correctly, ENSHA ALLA
nu is kinematic viscosity, divided solvent viscosity to density.
Note! polymer viscosity should be considered zero in Newtonian case.

Best
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Old   August 14, 2013, 08:32
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Quote:
Originally Posted by desert_1250 View Post
Hi again
i hopethat get your mean correctly, ENSHA ALLA
nu is kinematic viscosity, divided solvent viscosity to density.
Note! polymer viscosity should be considered zero in Newtonian case.

Best
your explain come back to viscoelastic solver I understood it. my problem is about icoFoam. please help me , I have 4 questions :
1) icoFoam results and viscoelasticfluidfoam are different at a unique fluid. and do the difference refer to density role?( I vanished polymer effect in my case by decreasing lambda and other viscoelastic properties)
2) and how do I fix it?
3) I need nu for icofoam and eta , rho for viscoelastic solver (eta/rho = nu *true/false*?) .
4) (if #3 is false) is there a utilities that can present density of a case solved by icoFoam ?
thanks again and good luck.
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Old   August 20, 2013, 05:04
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Quote:
Originally Posted by sandipd View Post
Hi Foamers,
I followed this procedure and it is working fine nw -

1) The ported version of the viscoelasticFluidFoam solver downloaded from - http://sourceforge.net/projects/vffof21x/. And then extracted to /user/home/ folder. It had 3 directories and 1 file inside, which needs to put into the right place of openfoam dir. Mainly, the 'src' directory need to be in the right place because the compilation of the solver search for this inside src/transportModels, i.e. -

a) Copied 'src/transportModels/viscoelastic/' directory to 'opt/openfoam201/src/transportModel' directory.
b) Copied 'applications/solvers/viscoelastic/viscoelasticFluidFoam/' directory to 'opt/openfoam201/solver' directory.
c) Copied 'tutorials/viscoelastic' directory to 'opt/openfoam201/tutorials' directory.
d) Copied the file 'wmakeViscoelasticFluidFoam' to 'opt/openfoam201/wmake' directory.

2) The source with system files and compilation done with -

a) The source file linking to the solver directory can be generated by -
'cd opt/openfoam201/src/transport models/viscoelastic/&& wmake libso && cd -'

b) The solver directory need to be compile, and it can be done by -
'cd opt/openfoam201/applications/solvers/viscoelastic/viscoelasticFluidFoam/ && wmake && cd -'

c) The recompilation of Openfoam directory was needed, and it is done by -
'cd opt/openfoam201$ ./Allwmake

Note : It will recompile whole openfoam directory (including viscoelasticFluidFoam) and end up
with - '/opt/openfoam201/platforms/linux64GccDPOpt/bin/viscoelasticFluidFoam' is up to date.

hence, it is done..!!!
hi amin144
how did you solve your question about step 2. now i face it and I need your help ! thangks a lot
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Old   August 20, 2013, 05:14
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Quote:
Originally Posted by jovani View Post
Hello Foamers,

My name is Jovani and I want announce that will soon be available a solver for treatment of viscoelastic fluid in OpenFOAM. I was working in the development of a viscoelasticFluidFoam solver (with the great orientation of the Dr. Hrvoje Jasak, thank you very much Hrvoje!!) to simulate viscoelastic flows.

The follow models are implemented: Maxwell, Oldroyd-B, Giesekus, PTT linear and exponential,
FENE-P, FENE-CR and DCPP. There are others models already implemented but not tested (Pom-Pom, SXPP, DXPP, WM ...).

The metodology used to obtain solutions in high We numbers was the DEVSS. The test geometry was mainly the 4:1 planar contraction. The solver are able to simulate multimode cases with n modes.

For the interested: A presentation that will soon be available on line to give more informations.

Jovani
hi jovani:
now i have installed the openfoam 2.1.1 succeed, of course i download your new viscoelasticFluidFoam files. but i do not kown how to add it in the openfoam. I think you can help me. Thanks a lot .
Have a nice day
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Old   August 20, 2013, 05:57
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Quote:
Originally Posted by sita View Post
Thanks, that seems to help!
Hi sita
now i have installed the openfoam 2.1.1 succeed, of course i download your new viscoelasticFluidFoam files. but i do not kown how to add it in the openfoam. I think you can help me. Thanks a lot .
Have a nice day
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Old   August 20, 2013, 07:57
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Quote:
Originally Posted by hcx552362 View Post
Hi sita
now i have installed the openfoam 2.1.1 succeed, of course i download your new viscoelasticFluidFoam files. but i do not kown how to add it in the openfoam. I think you can help me. Thanks a lot .
Have a nice day
just extract it in $WM_PROJECT_DIR and make sure that the wmakeViscoelasticFluidFoam file is exist in this directory.
then:
Code:
./wmakeViscoelasticFluidFoam
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Old   August 21, 2013, 04:12
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Quote:
Originally Posted by adambarfi View Post
just extract it in $WM_PROJECT_DIR and make sure that the wmakeViscoelasticFluidFoam file is exist in this directory.
then:
Code:
./wmakeViscoelasticFluidFoam


Hi, adambarfi;
Thanks for your reply, i follow your advise, but it does not work. can you give me more information, Thanks a lot
Have a nice day!
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Old   August 21, 2013, 04:44
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Quote:
Originally Posted by hcx552362 View Post
Hi, adambarfi;
Thanks for your reply, i follow your advise, but it does not work. can you give me more information, Thanks a lot
Have a nice day!
what do you mean of 'it doesn't work'?
any error?
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