[hcx552362]

Originally Posted by adambarfi

what do you mean of 'it doesn't work'?
any error?

Hi, Thanks a lot.
I have solved my question. I am so glad with your help.
Thanks again! but now another question is appear.
When I calculating the example of viscoelasticFluidFoam, I run this program,
code:
viscoelasticFluidFoam > log &
the results show that:
FOAM FATAL TO ARROR:
Unkown asymmetric matrix solver BICGSTAB
Valid asymmeyric matrix solvers are:
.........


what is wrong?
Have a nice day!

[adambarfi]

Originally Posted by hcx552362

Hi, Thanks a lot.
I have solved my question. I am so glad with your help.
Thanks again! but now another question is appear.
When I calculating the example of viscoelasticFluidFoam, I run this program,
code:
viscoelasticFluidFoam > log &
the results show that:
FOAM FATAL TO ARROR:
Unkown asymmetric matrix solver BICGSTAB
Valid asymmeyric matrix solvers are:
.........


what is wrong?
Have a nice day!

hi
I didn't hear before about BICGSTAB matrix solver. go to solutionDict and look for which equation you used BICGSTAB solver. change it to a asymmetric matrix solver.
it had guid you and had awared you about valid solvers in the last error.

[hcx552362]

Originally Posted by adambarfi

hi
I didn't hear before about BICGSTAB matrix solver. go to solutionDict and look for which equation you used BICGSTAB solver. change it to a asymmetric matrix solver.
it had guid you and had awared you about valid solvers in the last error.

Hi, I have sloved this question. My program is run already. Thanks a lot

Have a nice day!

[skykzhang]

Originally Posted by 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!

Hi, viscoelasticFormers, there is another question,
How can i get the parameters of the Giesekus Model about one melt through rheological experiments, like etaS, etaP, alfar, lambda. I want to fit the parameters through the polymat module.

[EricKl.]

Hello everyone,

I'm working with viscoelastic fluids in my thesis and i need compile viscoelasticInterFoam

Jovani sent me the files. They were: Case (the turorial); Solver (Tutorial - Make folder with; viscoelasticTwoPhaseModels - folder with make, and viscoelasticLaws viscoelasticModel).
I tried to install them as the tutorial viscoelasticFluidFoam (http://lists.cfd-online.com/pipermai...er/029862.html).
So I can not. Is generating a lot of mistakes.

Anyone have any tutorial or way to install it?


I put the folders as viscoelasticFluidFoam, but when I do the command
Wmake libso && && cd -

Generates this error

root @ admin-desktop: ~ / OpenFOAM/OpenFOAM-1.6-ext/src/transportModels/viscoelastic viscoelasticTwoPhaseModels # cd / && wmake libso && cd -
wmakeLnInclude: linking include files to. / lnInclude
make: *** No rule to make target `viscoelasticLaws / DCPP / DCPP.dep ', needed by` Make/linux64GccDPOpt/dependencies'. Stop.

Thanks in advance!
Erick

[sita]

Originally Posted by Raymond.Leoi

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

Dear Raymond,

In constant/viscoelasticProperties, you just need to remove the "type multiMode" part and only define one mode. It's all rather straightforward, and I think you can even check the viscoelasticProperties-files in the tutorials; there are both single- and multi-mode tutorials.
Furthermore, you need to substitute the taufirst, tausecond, etc. files under 0/ with a single tau file.

Good luck,
Sita

[sita]

Originally Posted by skykzhang

Hi, viscoelasticFormers, there is another question,
How can i get the parameters of the Giesekus Model about one melt through rheological experiments, like etaS, etaP, alfar, lambda. I want to fit the parameters through the polymat module.

Hi,

I think you should start with a basic rheology textbook. Some good ones are: Dynamics of Polymeric Liquids (Part I and II), by Bird, Armstrong and Hassager, Rheology: Principles, Measurements and Applications, by Macosko, and An Introduction to Rheology, by Barnes, Hutton and Walters. Also very instructive: Constitutive Equations for Polymer Melts and Solutions, by Larson.


Good luck,
Sita

[Raymond.Leoi]

Originally Posted by sita

Dear Raymond,

In constant/viscoelasticProperties, you just need to remove the "type multiMode" part and only define one mode. It's all rather straightforward, and I think you can even check the viscoelasticProperties-files in the tutorials; there are both single- and multi-mode tutorials.
Furthermore, you need to substitute the taufirst, tausecond, etc. files under 0/ with a single tau file.

Good luck,
Sita

Got it, Sita. Cheers.

[Raymond.Leoi]

I ran a case w/ cylinder using Oldroyd-B model and specified the fully-developed velocity profile for the inlet and zeroGradient for outlet. The velocity magnitude and streamline was shown in the attache snapshot. It's quite weird to see two circulation zones near the inlet. Any idea for this problem?

[salame]

Originally Posted by sita

Hi,

I think you should start with a basic rheology textbook. Some good ones are: Dynamics of Polymeric Liquids (Part I and II), by Bird, Armstrong and Hassager, Rheology: Principles, Measurements and Applications, by Macosko, and An Introduction to Rheology, by Barnes, Hutton and Walters. Also very instructive: Constitutive Equations for Polymer Melts and Solutions, by Larson.


Good luck,
Sita

Hi, sita:
Thanks!
These days, i read some books you recommanded. If take the single-modle, I think just the alfar should be fitted. is that right?

Great regards!
salame

[hcx552362]

Hello, everyone!
Did anyone who used the S-MDCPP model in the OpenFoam. When I using this Model, the result is not good! maybe it is not converage!
What is wrong ?
Thanks!

[hcx552362]

Hi ,
Did you use the S-MDCPP model in the OpenFoam. When I using this model , the result is poor!
Thanks

[Raymond.Leoi]

Originally Posted by hcx552362

Hello, everyone!
Did anyone who used the S-MDCPP model in the OpenFoam. When I using this Model, the result is not good! maybe it is not converage!
What is wrong ?
Thanks!

No clue about your problem. It would be helpful to give more details.

[hcx552362]

Hi, Thanks for youe reply!
When I employing the S-MDCPP model to do this case, and I transfer the result file to Tecplot360, the result is serious. For example, U P and Tau. I think the pattern is not steady!
Thanks a lot!

[adambarfi]

Originally Posted by hcx552362

Hi, Thanks for youe reply!
When I employing the S-MDCPP model to do this case, and I transfer the result file to Tecplot360, the result is serious. For example, U P and Tau. I think the pattern is not steady!
Thanks a lot!

how about the residuals and convergence?

[hcx552362]

Hi
I used the default file. for p is 1*10-7, and for tau and U is 1*10-6. The controlDict file is also default.
Thanks

[hcx552362]

Originally Posted by adambarfi

how about the residuals and convergence?

Hi
I used the default file. for p is 1*10-7, and for tau and U is 1*10-6. The controlDict file is also default.
Thanks

[adambarfi]

Originally Posted by hcx552362

Hi
I used the default file. for p is 1*10-7, and for tau and U is 1*10-6. The controlDict file is also default.
Thanks

I mean your residuals during your solution.
could you attach the log file?

[hcx552362]

Originally Posted by adambarfi

I mean your residuals during your solution.
could you attach the log file?

Hi, The log file contains a lot of something, Maybe the constitutive equation and parameter has some problems!
Thanks

[hcx552362]

Hi, everyone
When I using the S-MDCPP model by the default to solve my question, The results of U, P and tau is serious. the pattern is riots. What is wrong with this problem? Maybe you can run it, and check the result. Can anyone help me with this question?
Thanks a lot
best wishes
Have a nice day