Forum: OpenFOAM Running, Solving & CFD
January 13, 2023, 05:54
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Replies: 475
Views: 94,890
Hi Hari,
As I wrote earlier, I haven't used...
Hi Hari,
As I wrote earlier, I haven't used viscoelasticFluidFoam in a while (since 2015!), so I wouldn't know. Have you tried an online search? I just did, and the first hit I got is:...
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Forum: OpenFOAM Running, Solving & CFD
January 13, 2023, 01:28
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Replies: 475
Views: 94,890
Hi,
Sorry, I haven't used OpenFOAM in a...
Hi,
Sorry, I haven't used OpenFOAM in a while, so I wouldn't know for sure. As far as I'm aware, you need foamExtend to run viscoelasticFluidFoam.
If you take a look at the standard solvers in...
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Forum: OpenFOAM Running, Solving & CFD
September 2, 2021, 05:17
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Replies: 475
Views: 94,890
Floating point exception with Giesekus model
Hi Grace,
Hm, in that case I'd go back to the original Gieskus tutorial case, see if you can get that to run, and then take baby steps from there. For example, is there a way to cancel the...
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Forum: OpenFOAM Running, Solving & CFD
September 2, 2021, 02:48
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Replies: 475
Views: 94,890
Floating point exception with Giesekus model
Hi Grace,
Without having seen your geometry, mesh, boundary conditions, etc. I can't say much I'm afraid. However, from working with viscoelasticFluidFoam myself (ages ago...) I remember that the...
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Forum: OpenFOAM Running, Solving & CFD
March 16, 2020, 01:37
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Replies: 475
Views: 94,890
Hi Nick,
Attached you'll find a zipped...
Hi Nick,
Attached you'll find a zipped example. It was adapted from on of the viscoelasticFluidFoam tutorials, so I'm also sending a link to Jovani Favero's thesis...
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Forum: OpenFOAM Running, Solving & CFD
March 15, 2020, 11:51
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Replies: 475
Views: 94,890
Hi Nick,
Are you looking for an example for...
Hi Nick,
Are you looking for an example for viscoelasticFluidFoam, or rheoFoam, or a non-Newtonian example in OpenFOAM-7, or something different altogether?
I think I could dig up an example...
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Forum: OpenFOAM Running, Solving & CFD
February 10, 2020, 02:09
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Replies: 475
Views: 94,890
Hi Arash,
To be honest, I have no experience...
Hi Arash,
To be honest, I have no experience with rheoFoam, I used Jovani Favero's viscoelasticFluidFoam for all my viscoelastic simulations. As far as I remember, finding acceptable parameter...
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Forum: OpenFOAM Running, Solving & CFD
February 7, 2020, 10:08
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Replies: 475
Views: 94,890
Hi Arash,
As I said, the Oldroyd-B model is...
Hi Arash,
As I said, the Oldroyd-B model is not suitable for flows with an elongational component. If you take a look at the equations for the stress, you'll see why. I don't know what your flow...
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Forum: OpenFOAM Running, Solving & CFD
February 7, 2020, 08:17
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Replies: 475
Views: 94,890
Hi Arash,
When you say that the...
Hi Arash,
When you say that the viscoelasticFluidFoam solver crashed after 0.008 s, was that using the Oldroyd-B model, or the FENE-CR model?
You may want to try running at a lower Wi first,...
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Forum: OpenFOAM Running, Solving & CFD
February 7, 2020, 04:06
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Replies: 475
Views: 94,890
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Forum: OpenFOAM Running, Solving & CFD
January 31, 2020, 13:50
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Replies: 475
Views: 94,890
Hi Arash,
The Oldroyd-B model gives...
Hi Arash,
The Oldroyd-B model gives unbounded stress if the elongation rate in your flow exceeds 1/(2 lambda), with lambda your relaxation time. I don't know what your flow looks like, but this...
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Forum: OpenFOAM Running, Solving & CFD
January 28, 2019, 06:48
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Replies: 475
Views: 94,890
Dear Ali,
If you're planning to publish your...
Dear Ali,
If you're planning to publish your results, I think it would be a good idea to look into the details of both models, and how these models apply to the problem you solved. Ask yourself...
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Forum: OpenFOAM Running, Solving & CFD
January 28, 2019, 02:14
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Replies: 475
Views: 94,890
Second order fluid
Hi Alimea,
The second order fluid is a very simple model to describe non-Newtonian flow effects (see e.g. the books by Bird and/or Macosko). It only holds for flows that are sufficiently slow and...
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Forum: OpenFOAM Running, Solving & CFD
May 4, 2016, 05:57
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Replies: 475
Views: 94,890
Hi,
I haven't used viscoelasticFluidFoam in...
Hi,
I haven't used viscoelasticFluidFoam in a while, but as far as I'm aware, it's part of the OpenFOAM-Extend project: http://www.extend-project.de
So if you install OpenFOAM-Extend (instead of,...
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Forum: OpenFOAM Running, Solving & CFD
December 19, 2014, 05:15
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Replies: 475
Views: 94,890
Hi Ali,
If you want to solve problems with...
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...
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Forum: OpenFOAM Running, Solving & CFD
December 19, 2014, 05:07
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Replies: 475
Views: 94,890
Hi Alexa,
The .tgz file you have is a...
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...
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Forum: OpenFOAM Running, Solving & CFD
July 31, 2014, 07:18
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Replies: 475
Views: 94,890
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Forum: OpenFOAM Running, Solving & CFD
July 31, 2014, 03:11
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Replies: 475
Views: 94,890
Hi Ron,
Maybe this helps?
Viscoelastic...
Hi Ron,
Maybe this helps?
Viscoelastic flow past a cylinder: drag coefficient. Nhan Phan-Thien & Hua-Shu Dou (1999). Computer Methods in Applied Mechanics and Engineering, 180 (3-4), pp....
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Forum: OpenFOAM Running, Solving & CFD
July 23, 2014, 04:35
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Replies: 475
Views: 94,890
FENE model parameters
Dear Jovani,
In your FENE-P and FENE-CR models, the values of etaS and etaP should be specified. What do these parameters mean physically? My first guess would be that etaS + etaP = eta_eff (i.e....
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Forum: OpenFOAM Running, Solving & CFD
May 14, 2014, 00:54
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Replies: 475
Views: 94,890
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Forum: OpenFOAM Running, Solving & CFD
April 1, 2014, 03:38
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Replies: 475
Views: 94,890
OK, I give up: last Thursday I installed...
OK, I give up: last Thursday I installed foam-extend-3.0 from source, tested it on the Oldroyd-B tutorial, AND IT WORKED!!! No problems with finding the Cholesky preconditioner or anything.
So...
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Forum: OpenFOAM Running, Solving & CFD
March 18, 2014, 10:33
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Replies: 475
Views: 94,890
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Forum: OpenFOAM Running, Solving & CFD
March 18, 2014, 05:43
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Replies: 475
Views: 94,890
foam-extend-3.0 preconditioner problem
Dear all,
Recently, I upgraded to foam-extend-3.0. To test if viscoelasticFluidFoam works all right under this version, I tried to run the Oldroyd-B tutorial case. It gives an error regarding the...
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Forum: OpenFOAM Running, Solving & CFD
August 26, 2013, 08:53
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Replies: 475
Views: 94,890
Hi,
I think you should start with a basic...
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...
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Forum: OpenFOAM Running, Solving & CFD
August 26, 2013, 08:31
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Replies: 475
Views: 94,890
Dear Raymond,
In...
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...
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