[arjun]

Originally Posted by FMDenaro

Hello,
What about the developing stage of dynamic LES modelling?

Dynamic SGS is available in the version about to be released in a week or so.

Fluent has transport equation for k based LES too along with dynamic procedure.

This needs to be added as currently FVUS only has k transport based LES and no dynamic version of it. This i will do as i get time.


PS: Also added bounded central differencing for LES flows.

[FMDenaro]

Originally Posted by arjun

Dynamic SGS is available in the version about to be released in a week or so.

Fluent has transport equation for k based LES too along with dynamic procedure.

This needs to be added as currently FVUS only has k transport based LES and no dynamic version of it. This i will do as i get time.


PS: Also added bounded central differencing for LES flows.

Thanks,
Is it possible to set bounded or unbounded central difference?
Have you performed some test?

[arjun]

Originally Posted by FMDenaro

Thanks,
Is it possible to set bounded or unbounded central difference?
Have you performed some test?

Simple tests are done but i think a more serious test needs to be done.

I take it up and also need to add the inflow turbulence generator.

[FMDenaro]

Originally Posted by arjun

Simple tests are done but i think a more serious test needs to be done.

I take it up and also need to add the inflow turbulence generator.

Ok, let me know about your progress in doing the test-cases.
Thanks

[arjun]

Originally Posted by FMDenaro

Ok, let me know about your progress in doing the test-cases.
Thanks

I probably get some time in first week of june. Do you have any preference for the test case. I see if I could do that.

Also

Originally Posted by FMDenaro

Is it possible to set bounded or unbounded central difference?

At the moment unbounded or unlimited versions are not available, but I think your idea has merit and user shall be able to set the "unboundedness" . That means that user shall be able to set limiter-min and limiter max that solver shall respect.

And by adjusting these to 1,1 one shall be able to get unbounded versions of these schemes.

I will keep this as a feature for future releases.

It isn't this simple in FVUS though because solver has automatic cell quality remediation built in and that likey to hinder this limiting when cell quality drops. So may be with assumption that user created mesh where all the cells are above certain cell quaility this can be provided.
(Also if cell quality is bad then unbounded may be unstable anyway).

[FMDenaro]

I suggest to do the test for the planar channel flow at a certain Re_tau value. It would be useful to check the code in DNS conditions before doing LES.
If you are interested, you can try to use the same grid parameters we used in this study where several CFD codes were tested:
https://www.researchgate.net/publica...blicationTitle

[arjun]

Originally Posted by FMDenaro

I suggest to do the test for the planar channel flow at a certain Re_tau value. It would be useful to check the code in DNS conditions before doing LES.
If you are interested, you can try to use the same grid parameters we used in this study where several CFD codes were tested:
https://www.researchgate.net/publica...blicationTitle

This is extremely useful in many ways. I thank you for this.

I see that you are one of the authors, so if you have mesh lying around then it would be even better as apples to apples comparison could be made.

Also gives me opportunity to test/improve the code and also is helpful for user as he can then have some trust in FVUS (being pretty new code).


PS: Is it possible for you to mail me pdf of it at arjun.yadav@yahoo.com

[FMDenaro]

Originally Posted by arjun

This is extremely useful in many ways. I thank you for this.

I see that you are one of the authors, so if you have mesh lying around then it would be even better as apples to apples comparison could be made.

Also gives me opportunity to test/improve the code and also is helpful for user as he can then have some trust in FVUS (being pretty new code).

We used a structured constant 64x64 grid in the homogeneous plane and two different stretched grids along the normal-to-wall direction. Details are in the paper so that you can use exactly the same resolution. You see that we computed also the no-modelled LES.

[arjun]

Originally Posted by FMDenaro

We used a structured constant 64x64 grid in the homogeneous plane and two different stretched grids along the normal-to-wall direction. Details are in the paper so that you can use exactly the same resolution. You see that we computed also the no-modelled LES.

Thank you I try to follow it.

By a quick glance saw an interesting comment about Fluent's bounded scheme that it had dissipation. Will see how FVUS does. Thank you again.


PS: Also got your mail too.

[arjun]

FVUS Release 1.2 Beta is available from today to be downloaded from www.dravvya.co.in

Additions

Reactive Flow

• ReactingSpeciesModel and FractionalFlowModel

Work together to provide finite rate combustion framework.
Turbulence

• Standard K-Epsilon Turbulence Model
• Dynamic Smagorinsky Subgrid
• Bounded Central Differencing for Flow.

Firekatze
Firekatze is a separate product aimed at chemical reaction dynamics.
Current version of Firekatze translates CHEMKIN input files to FVUS format so that they can be further used for setting up simulations for Reacting flows.
Second task that Firekatze performs is of bundling species of similar transport properties into groups. This significantly reduces diffusion coefficient calculation times during simulation.


Note:
It is termed beta release as Reacting Flow model goes into further validations and tests. It is likely to add further options as users try to test and request additional features into it.
Also for this release Windows version is not available.

[arjun]

Uploaded a video tutorial outlining a simple workflow with FVUS Wildkatze.

https://youtu.be/tgB8wedPhpA

Please use the highest resolution on youtube to see it clearly

NOTE

The pdf and mesh files etc shall be available as part of solver download. The latest version shall be uploaded soon this week sometime. The workflow is applicable to currently available version too.