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Search: Posts Made By: jovani
Forum: OpenFOAM Running, Solving & CFD March 13, 2014, 22:10
Replies: 373
Views: 41,377
Posted By jovani
Hello Heliana, I've never heard about a...

Hello Heliana,

I've never heard about a "magic" rule to choose an optimal relaxation factor, it depends on each case and can be changed along the simulation time. On the other hand, "0" makes not...
Forum: OpenFOAM Running, Solving & CFD October 24, 2012, 07:14
Replies: 373
Views: 41,377
Posted By jovani
Hi Amin, I never needed this yet. A possible...

Hi Amin,

I never needed this yet. A possible way: If you have solvent viscosity (etaS != 0) sum up the solvent and polymer stress to get the total stress. The polymer is just tau returned back by...
Forum: OpenFOAM Running, Solving & CFD June 17, 2012, 17:57
Replies: 373
Views: 41,377
Posted By jovani
Hello dear Sita, There is an old post where...

Hello dear Sita,

There is an old post where you find some hints about transient simulation using the viscoelasticFluidFoam solver:...
Forum: OpenFOAM Running, Solving & CFD May 9, 2012, 20:19
Replies: 373
Views: 41,377
Posted By jovani
It is now also available to download on: ...

It is now also available to download on:
http://sourceforge.net/projects/vffof21x/files/viscoelasticFluidFoam-1.0-OpenFOAM-2.1.x.tgz/download

Regards,
Jovani
Forum: OpenFOAM Running, Solving & CFD May 6, 2012, 17:02
Replies: 373
Views: 41,377
Posted By jovani
viscoelasticFluidFoam for OpenFOAM-2.1.x

Hello Dear Foamers,

Bellow you find a ported version of the viscoelasticFluidFoam solver for the OpenFOAM-2.1.x. The actual version found on OpenFOAM-1.6-ext do not compile in the OpenFOAM-2.1.x...
Forum: OpenFOAM Running, Solving & CFD February 23, 2012, 11:22
Replies: 373
Views: 41,377
Posted By jovani
Hello to everyone, About the boundary...

Hello to everyone,

About the boundary conditions at wall we have at less three options to use:
1 - zeroGradient: a zero order approximation from internal field to boundaries. It is necessary to...
Forum: OpenFOAM Running, Solving & CFD August 30, 2011, 12:19
Replies: 373
Views: 41,377
Posted By jovani
Hello Amir, Take a look on multimode.C file,...

Hello Amir,

Take a look on multimode.C file, the bellow code part that do the summation you are looking for. divTau function return the summation of each mode for the momentum equation and tau()...
Forum: OpenFOAM Running, Solving & CFD October 24, 2010, 09:31
Replies: 373
Views: 41,377
Posted By jovani
Hello Mohsen, I am not sure about the...

Hello Mohsen,

I am not sure about the problem, but i can contribute with a tip:

try to use fully 3D geometry for your simulation, i.e, do not use the empty BC:
frontAndBack
{
type empty;
}
Forum: OpenFOAM Running, Solving & CFD October 19, 2010, 07:54
Replies: 373
Views: 41,377
Posted By jovani
Hello Mohsen, This seems your internal field...

Hello Mohsen,

This seems your internal field for taufirst is wrong, you consider a nine components for internal field, now you are working with the complete stress tensor??

If it is not this...
Forum: OpenFOAM Running, Solving & CFD October 18, 2010, 13:01
Replies: 373
Views: 41,377
Posted By jovani
Hi Mohsen, Good, now you need make it...

Hi Mohsen,

Good, now you need make it recursive back to the tree --> multiMode --> viscoelasticLaw ..... This make the other models bad to be used. You need compile only your new model, with all...
Forum: OpenFOAM Running, Solving & CFD October 17, 2010, 12:07
Replies: 373
Views: 41,377
Posted By jovani
Hello mohsen, Your problem is with the term...

Hello mohsen,

Your problem is with the term [(omega . a) - (a . omega)] in equation for "a". The return of this operation is a tensorField and not a symmTensorField. Then two options to overcome...
Forum: OpenFOAM Running, Solving & CFD June 29, 2010, 22:56
Replies: 373
Views: 41,377
Posted By jovani
Hello Ata, The solver was not yet released....

Hello Ata,

The solver was not yet released. People from my old work group are using it to proceed with some simulations.

Best regards,
Jovani
Forum: OpenFOAM Running, Solving & CFD June 25, 2010, 19:19
Replies: 373
Views: 41,377
Posted By jovani
Hello, I think there is anything about it in...

Hello,

I think there is anything about it in older posts. The line command bellow can download all OF-dev:

svn checkout...
Forum: OpenFOAM Running, Solving & CFD March 13, 2010, 20:47
Replies: 373
Views: 41,377
Posted By jovani
Hello, Ata, you need more then only...

Hello,

Ata,
you need more then only "wmake" to compile this, once you are trying compile a LIBRARY (the viscoelastic models library). You must compile without problems using "wmake libso", this...
Forum: OpenFOAM Running, Solving & CFD March 10, 2010, 23:05
Replies: 373
Views: 41,377
Posted By jovani
Using probe in OpenFOAM

Hello Foamers,

Sometimes we want take the value of some property in any point of the domain for each time step. We do not need save data for each time step, once we can do more easy in OpenFOAM.
...
Forum: OpenFOAM Running, Solving & CFD February 20, 2010, 17:07
Replies: 373
Views: 41,377
Posted By jovani
Hello Mohsen, This simulations really takes...

Hello Mohsen,

This simulations really takes some time. I see you changes in relaxation factors, but this is very very small now, this parameters is to make the problem more stable smoothing the...
Forum: OpenFOAM Running, Solving & CFD February 7, 2010, 15:23
Replies: 373
Views: 41,377
Posted By jovani
Hi Mohsen, You need specifies what OpenFOAM...

Hi Mohsen,

You need specifies what OpenFOAM version are you using.
IF you are using OpenFOAM-1.5-dev the solver is already after you compiles the OF sources.
IF you have other OF them take a...
Forum: OpenFOAM Running, Solving & CFD February 6, 2010, 18:29
Replies: 373
Views: 41,377
Posted By jovani
Hello Tajoooko, The papers about the solver...

Hello Tajoooko,

The papers about the solver was submitted but they are with the reviewers!
There is a small paper was presented in a congress and now published:
...
Forum: OpenFOAM Running, Solving & CFD February 5, 2010, 23:00
Replies: 373
Views: 41,377
Posted By jovani
Hello Mohsen, Include a new model is simple....

Hello Mohsen,

Include a new model is simple. See what Ata have to help you and remember:
To include a new model the only place you need make changes is on...
Forum: OpenFOAM Running, Solving & CFD December 14, 2009, 12:47
Replies: 373
Views: 41,377
Posted By jovani
Hello António, Good!! I used paraview to cut...

Hello António,

Good!! I used paraview to cut plane results, but sample utility is better to good graphics for publication. For unsteady answer I used the probe utility.

Best,

Jovani
Forum: OpenFOAM Running, Solving & CFD December 4, 2009, 18:50
Replies: 373
Views: 41,377
Posted By jovani
António, Your etaS in last case is small and...

António,

Your etaS in last case is small and take it to be zero do not will give problems!! I think your convergences problems is the sum of various things in simulation case definition. Your...
Forum: OpenFOAM Running, Solving & CFD December 3, 2009, 19:49
Replies: 373
Views: 41,377
Posted By jovani
First thank you Hrvoje!! EVSS is very...

First thank you Hrvoje!!

EVSS is very different, once is needed a change on the constitutive equation (in my master thesis is very clear this point).
And more, I tested the EVSS methodology too...
Forum: OpenFOAM November 5, 2009, 10:31
Replies: 12
Views: 2,066
Posted By jovani
Hello Primoz, As UCM is a problematic model...

Hello Primoz,

As UCM is a problematic model in the numerical point of view, this is not a surprise find cases witch the solution diverges. For 2D simulations exists a limit of De for UCM model and...
Forum: OpenFOAM October 28, 2009, 09:50
Replies: 12
Views: 2,066
Posted By jovani
Hello Primoz, Sorry for the delay, I most...

Hello Primoz,

Sorry for the delay, I most often see the "Viscoelastic Fluid Flows using OpenFOAM The solver viscoelasticFluidFoam" because the advertise by email to replies. But let's to your...
Forum: OpenFOAM Running, Solving & CFD September 18, 2009, 17:55
Replies: 373
Views: 41,377
Posted By jovani
Hello Teresa, As nobody post the results of:...

Hello Teresa,

As nobody post the results of:

"You need take the directory /viscoelastic (OpenFOAM-1.5-dev/src/transportModels/) and put into your OF. Add the line " wmake libso viscoelastic"...
Showing results 1 to 25 of 41

 
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