[sita]

Thanks, that seems to help!

[sita]

Originally Posted by Raymond.Leoi

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

[Raymond.Leoi]

I see, Sita. Many thanks.

Originally Posted by sita

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

[mohamadreza89]

Hi Jovani
I'm master student and for my thesis I need viscoelasticInterFoam solver, If you can help me I'm so glad,
mohammadreza

[salame]

Hi, Sita:
The parameters which can get like you say are important to me, too. Thank you for your explain in details.


salame

Originally Posted by sita

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

[skykzhang]

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!

[mohamadreza89]

Hi friend,
can anyone help me to find viscoelasticInterFoam solver to simulate free surface problem?
thanks alot,

[sita]

Originally Posted by mohamadreza89

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

[Raymond.Leoi]

There are four modes for the default PTT-Exponential. If only one mode is concerned, how to disable the rest higher modes?

[ali jafari]

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 ?

[desert_1250]

Originally Posted by ali jafari

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

[ali jafari]

Originally Posted by desert_1250

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.) !!!)

[desert_1250]

Originally Posted by ali jafari

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

[ali jafari]

Originally Posted by desert_1250

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.

[hcx552362]

Originally Posted by sandipd

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

[hcx552362]

Originally Posted by jovani

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

[hcx552362]

Originally Posted by sita

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

[adambarfi]

Originally Posted by hcx552362

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:

./wmakeViscoelasticFluidFoam

[hcx552362]

Originally Posted by adambarfi

just extract it in $WM_PROJECT_DIR and make sure that the wmakeViscoelasticFluidFoam file is exist in this directory.
then:

./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!

[adambarfi]

Originally Posted by hcx552362

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?