[tsencic]

Hi,
I have about 10 cells in the radial direction (Y) to the furthest parcels. I will try a finer mesh, but for my final purpose(a domain of 2 m), that is not an acceptable aproach.
Where can I check the droplet momentum relaxation timescale? And the number of droplets per parcel?
I noticed that when I turn the drag off the resulting angle is equal to what i set. I'll try to change the drag model coefficients and see what can I get.

Tomislav

[prettyflower]

Hello dear

I want to model a pressure swirl atomizer.does it need to describe an injectormodel in sprayproperties file in aachenBomb tutorial?
can I TURN ON atomization model instead of injector model for pressure atomizer?because I don't know how to set pressureSwirlInjectorCoeffs in injectormodel in sprayproperties file.

thanks
regard.

[Rickard.Solsjo]

Niklas! You seem to know your way around the massflowprofile and massflowrate.
I want to inject a fuel modelled as a gas and not liquid into my chamber. Is it even possible to well-define the nParcels or do they only work for liquid?

Regards
R

[Nam]

Originally Posted by tsencic

Hi,
I have about 10 cells in the radial direction (Y) to the furthest parcels. I will try a finer mesh, but for my final purpose(a domain of 2 m), that is not an acceptable aproach.
Where can I check the droplet momentum relaxation timescale? And the number of droplets per parcel?
I noticed that when I turn the drag off the resulting angle is equal to what i set. I'll try to change the drag model coefficients and see what can I get.

Tomislav

Hello Tomislav,

Have you ever been able to solve the spray shape issue? I also run into the same problem you have encountered. The parcels are just not flying out in the cone pattern, unless the drag is not used. I appreciate your answer.

Nam

[N. A.]

Hello folks,

Does anyone know how to add one more variable to lagrangian particle equations. We solve for x,T,d, etc.

I am trying to solve for one more variable, distorted surface area and would like to store as a property of the particle.

If anyone can through some information/tutorial on how to add one more variable for lagrangian particles, that will be very helpful.

Thanks,
Nir

[ENKIME]

Hello Niklas
Sorry for bother, hopping you can help me with a problem.
I'm running a diesel spray using OpenFoam 2.2.2, first I run tri-decane but I need to run linoleic acid, so the issue is this. For the selection of the break up model I need the weber number that is function of the surface tension so the question is Where is the surface tension? I can't see it in the paraview and the models are set as an scalar.
Thanks a lot hopping if you can help me
Kind regards

[dkxls]

At first, please note that this thread is about the dieselFoam solver that got removed in OpenFOAM version 2.1. The new solver sprayFoam is a completely different solver and many things, also in the configuration files, got changed!

Originally Posted by ENKIME

I'm running a diesel spray using OpenFoam 2.2.2 ...

You shouldn't use OpenFOAM 2.2.2 for any Lagrangian spray simulations, there are still some severe bugs in that version. Most bugs got fixed in the 2.2.x git tree, but I would recommend you to switch to 2.3.x
There have lately been some more bug fixes that are only available in the 2.3.x version, so you either can wait for 2.3.1 or use a recent git version again.

Originally Posted by ENKIME

Where is the surface tension?

Surface tension is defined in the liquid properties:

src/thermophysicalModels/properties/liquidProperties/

Regards,
Armin

[ENKIME]

Dear Armin
Thanks a lot for your quickly reply, it's really hard that someone answer in this old post.
I know that sprayFoam is quite different to diesel Foam, but is the one I need to use, by the way I can actually make it works pretty good, but the issue is that in the thermophysical models src/thermophysicalModels/properties/liquidProperties there is only a few liquids and I need Linoleic acid, main component of biodiesel, so I need to add the properties of thet component? there is way to track surface tension at the end of a simulation?
Thanks a lot
Kind Regards

[dkxls]

Originally Posted by ENKIME

it's really hard that someone answer in this old post.

Well you are hijacking old threads, that's a really bad practice! Please read this thread very carefully and your chances to get help will be much higher:
http://www.cfd-online.com/Forums/ope...-get-help.html

Originally Posted by ENKIME

by the way I can actually make it works pretty good

"Pretty good", yes, but you will still produce wrong results. Anyway, not my problem.

Originally Posted by ENKIME

so I need to add the properties of thet component?

Yes, if the component you need is not in that folder, then you need to add it on your own. Search the forum, you are not the first one with that problem.

Originally Posted by ENKIME

there is way to track surface tension at the end of a simulation?

Yes, use version 2.3 and you will get the surface tension as a post-processing quantity. For version 2.2 you have to write your own utility to get that information, also not that difficult, but much more work compared to just having it readily available in ParaView.

[ENKIME]

Thanks a lot Armin
What version did you recommend that produced good results?
Regards

[dkxls]

I would probably recommend you to use the latest 2.3.x git version.

Though I haven't tested 2.3.x yet, I use right now the latest 2.2.x git version with some additional bug-fixes.

For instructions on how to install an OpenFOAM git version see:
http://www.openfoam.org/download/git.php

-Armin


P.S.: In case you would use openSUSE linux, I maintain a package that provides a "regularly updated" OpenFOAM git version:
http://software.opensuse.org/package/openfoam23x
http://software.opensuse.org/package/openfoam22x

[ENKIME]

Thanks a lot dude.
I already update my OpenFoam version and starting to create my own liquid library.
Kind regards

[ron_OFuser]

Nice thread

Thanks!

[ron_OFuser]

How to get tutorials and solver file for dieselFoam solver?

Urgent!!!

[ENKIME]

Hello Ron
Check out this file..
dieselFoam tutorial, from Chalmers, the new solver sprayFoam is quite different so be carefull
Kind Regards

[ron_OFuser]

Originally Posted by ENKIME

Hello Ron
Check out this file..
dieselFoam tutorial, from Chalmers, the new solver sprayFoam is quite different so be carefull
Kind Regards

Thanks Bro

[ron_OFuser]

Anybody knows the weblink for the dieselFoam tutorial from Chalmers and the new solver sprayFoam ?

[wyldckat]

Originally Posted by ron_OFuser

Anybody knows the weblink for the dieselFoam tutorial from Chalmers and the new solver sprayFoam ?

Quick answer:

• https://openfoamwiki.net/index.php/C...lFoam_Tutorial
• dieselFoam was dropped in OpenFOAM 2.1. For more details:
  • http://www.cfd-online.com/Forums/ope...m-2-1-0-a.html
  • http://www.cfd-online.com/Forums/ope...roperties.html
• Therefore, the "new" sprayFoam is likely the one that appeared in OpenFOAM 2.1. If you use the latest OpenFOAM 2.3.1, you'll be certain to be using the latest sprayFoam solver: http://www.openfoam.org/version2.3.1/

[ENKIME]

Hello Ron maybe this can help.
http://www.tfd.chalmers.se/~hani/kur...ered_NL_HN.pdf