[sita]

Originally Posted by ron_OFuser

Thank you Sita for the same.

Do you know how would I implement the drag coefficient equation for these fluids in OpenFOAM?

You mean you want OpenFOAM to calculate the drag coefficient, as part of a simulation? You can use functionObjects for things like that, for example forceCoeffs might be a good one to start out with. You can find tutorials on how to use functionObjects on the internet, for example, this is one where they compute lift and drag coefficients on an airfoil.

It might be not completely straightforward to implement function objects for viscoelasticFluidFoam, though, as many of these function objects assume your case contains a transportProperties file, values of phi in each time directory, etc., which viscoelasticFluidFoam doesn't. Fixing this might require quite some work, I don't know, never tried.

Good luck,
Sita

[ftmh]

Hi everyone
I try to model a tank with water in but in solution part it has the below error.
can you help me?


"Water Liquid contains invalid property data.
These problems are:
Elasticity is required, but is currently undefined.

Please switch to Engineering Data and correct the invalid property data"

[Raymond.Leoi]

Hi all,

When the PCG solver is used for p, it took very long time to get converged for a viscoelastic flow. Any idea for speeding up the convergence?

Cheers.
Raymond

[makaveli_lcf]

Hi Raymond. did you try GAMG solver?

Cheers,
Alexander

[Raymond.Leoi]

Thanks, Alexander. I did try it as well as smoothSolver and none of them works.

Originally Posted by makaveli_lcf

Hi Raymond. did you try GAMG solver?

Cheers,
Alexander

[AlexaB]

hi everybody!

I'm stuck in a quite basic problem and I kindly would like to ask your help...

I'm very new at Ubuntu and openfoam. I'm trying to discover how to install the solver viscoelasticFluidFoam in OpenFOAM 2.1.1 but I don't know what to do with the .tgz file.

Can someone please help me and describe me what steps should I take to install it?

I would be very grateful for your attention!!

[AlexaB]

Anybody, please?

[ali jafari]

hi

I try to solve some problems by gisekus and oldroyd-b with negligible and zero solvent viscosity. viscoelasticfluidfoam can not do it. when I increase solvent viscosity it converges.
do I modify code (transport model) ? any suggestion?

Best regards

[NickolasPl]

Hi Ali,

I had the same problem with these models as with all the rest that had solvent viscosity. A general practise in numerics would be to avoid giving zero values in general, especially when the code is a black box. So better place values as 0.000000001 or something which means zero. I'am not sure if the solvent viscosity in the equations OF solves is in the denominator and by zero goes to infinity and this might be a reason it does not converge.

Nickolas

[sita]

Hi Alexa,

The .tgz file you have is a compressed archive, you can unpack it by opening a terminal and typing:

tar -zxfv file.tgz

(file.tgz is a dummy name here, you should use the name of your file). tar is a program that can do packing/unpacking in Linux, -z means uncompress, x = extract, f means that tar should use the specified file name, and v stands for verbose, meaning that the program will inform you about its progress.

Further instructions for the installation of OpenFOAM can be found on the OpenFOAM-Wiki: http://openfoamwiki.net/index.php/Installation

Also Google can be extremely useful to find information on both (Ubuntu) Linux and OpenFOAM.

Good luck,
Sita

Originally Posted by AlexaB

Anybody, please?

[sita]

Hi Ali,

If you want to solve problems with zero solvent viscosity (i.e. modelling a polymer melt), you'd better use a model that is specifically meant for that. The melt equivalent of Oldroyd-B is the Upper Convected Maxwell model. Other, more sophisticated melt models in viscoelasticFluidFoam are the Pom-Pom-type models, like DCPP.

Good luck,
Sita

Originally Posted by ali jafari

hi

I try to solve some problems by gisekus and oldroyd-b with negligible and zero solvent viscosity. viscoelasticfluidfoam can not do it. when I increase solvent viscosity it converges.
do I modify code (transport model) ? any suggestion?

Best regards

[Annier]

Hi all,
I am using OpenFOAM 2.3.x in Ubuntu 14.04. I installed it as per the steps described in http://www.tfd.chalmers.se/~hani/kur...OwnLaptop.html.
Is viscoelasticFluidFoam a solver that is similar like other solvers such as nonNewtonianIcoFoam? Where is this viscoelasticFluidFoam library located inside the OpenFOAM?
In simple, i would request you to clarify the morphology(structure) of viscoelasticFluidFoam and its location.
For an example:
the location of nonNewtonianIcoFoam solver is
OpenFOAM/OpenFOAM2.3.x/applications/solvers/incompressible/
What would this be in context of viscoelasticFluidFoam?



Thanking you.

Yours
Anil Kunwar

[ron_OFuser]

ANIL: Why don't you google it ? All the answers are available in many posts/books/files etc. . It is advisable to do thorough search on topic before posting your query.

[adambarfi]

Originally Posted by Annier

Hi all,
I am using OpenFOAM 2.3.x in Ubuntu 14.04. I installed it as per the steps described in http://www.tfd.chalmers.se/~hani/kurser/OS_CFD/OpenFOAMonYourOwnLaptop.html.
Is viscoelasticFluidFoam a solver that is similar like other solvers such as nonNewtonianIcoFoam? Where is this viscoelasticFluidFoam library located inside the OpenFOAM?
In simple, i would request you to clarify the morphology(structure) of viscoelasticFluidFoam and its location.
For an example:
the location of nonNewtonianIcoFoam solver is
OpenFOAM/OpenFOAM2.3.x/applications/solvers/incompressible/
What would this be in context of viscoelasticFluidFoam?



Thanking you.

Yours
Anil Kunwar

see this post: http://www.cfd-online.com/Forums/ope...tml#post360185

Regards,
Mostafa

[Hiroshiman]

Hi every one,
I'm working on multiphasic flows of viscoelastic fluids. I used the interDyMFoam and viscoelasticFluidFoam from of OE 3.1 to create a interViscoDyMFoam, using the work here.
However, the viscosity from the constant/transportProperties is still used by the twoPhaseMixture operation :

    
     nuModel1_
     (
    viscosityModel::New
         (
             "nu1",
             subDict(phase1Name_),
             U,
             phi
         )
     ),
     nuModel2_
     ( 
        viscosityModel::New
         ( 
            "nu2",
             subDict(phase2Name_),
             U,
             phi
         )
     ),

How can I replace these values read in a dictionnary by values computed from the flow field ? Or maybe there is a simpler approach..


edit:
actually I'd only need to read the viscoelascticProperties from the twoPhaseMixture files. However, the definitions are quite different from reading from the transportProperties files as usual. How could I, for example, read etap1 from constant/viscoelascticProperties in twoPhaseMixture.C ?


Best regards,
Florian

[arash.heidarian]

Hello fomers:
Does anyone have the viscoelasticThermalFoam solver? or any information about it.
thank you.

[cliff]

Hi Foamers. how long does it take to recompile?

[Hiroshiman]

Originally Posted by cliff

Hi Foamers. how long does it take to recompile?

About 3h on my K6 166. Depending on the presence of solar winds or not of course.

[cliff]

Hi Foamers. i've got a question sandip. How long does it take to recompile?

[cliff]

Sorry i posted the same question. as i wanted to run one of viscoelastic tutorial, i came up with this error
/*---------------------------------------------------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 2.3.1 |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
Build : 2.3.1-bcfaaa7b8660
Exec : blockMesh
Date : Jan 28 2015
Time : 20:14:15
Host : "sepinood-Inspiron-N5010"
PID : 27458
Case : /opt/openfoam231/tutorials/viscoelastic/viscoelasticFluidFoam/DCPP/constant/polyMesh
nProcs : 1
sigFpe : Enabling floating point exception trapping (FOAM_SIGFPE).
fileModificationChecking : Monitoring run-time modified files using timeStampMaster
allowSystemOperations : Allowing user-supplied system call operations

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Create time



--> FOAM FATAL IO ERROR:
cannot find file

file: /opt/openfoam231/tutorials/viscoelastic/viscoelasticFluidFoam/DCPP/constant/polyMesh/system/controlDict at line 0.

From function regIOobject::readStream()
in file db/regIOobject/regIOobjectRead.C at line 73.

FOAM exiting
i would appreciate your help. thanks