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IDProjectCategoryView StatusLast Update
0001000OpenFOAMBugpublic2016-02-03 14:15
Reporterdkxls Assigned Tohenry  
PrioritynormalSeverityfeatureReproducibilityN/A
Status closedResolutionsuspended 
PlatformLinux x86_64OSopenSUSEOS Version12.2
Summary0001000: [SprayParcel]: Make atomization and breakup models not exclusive
DescriptionThe atomization and breakup models should not be exclusive, as some breakup models (e.g. KHRT [1] and ETAB [2,3]) also incorporate an atomization model in their original formulation. To be more precise, a special treatment for droplets in the liquid core (the so called "blobs") is applied in these models. For instance the "blob" injection model by Reitz applies the KH part of the KHRT model to droplets in the liquid core (the original ETAB model as an analogous mechanism).

The implementation of these breakup models in OpenFOAM does not include the special breakup mechanisms for droplets in the liquid core, neither in the atomization (BlobsSheetAtomization) nor in the breakup models.
Where this can be seen as missing feature, the exclusive treatment of atomization and breakup models makes the inclusion of these feature rather cumbersome.

Hence, the atomization model should be used to determine if the droplet is in the liquid core or not (and possibly apply already a breakup mechanism, e.g. LISA).
The breakup model can then still decides whether to apply a special breakup mechanism or not.

A proper solution to this problem would be to merge the breakup models into the atomization class and distinguish between primary (atomization) and secondary breakup.
This would not only enhance the atomization/breakup models, but also yield computational improvements and significant simplifications to the source code.

References:
[1] Beale, J.C.; Reitz, R.D., "Modeling Spray Atomization with the Kelvin-Helmholtz/Rayleigh-Taylor Hybrid Model," Atomization and Sprays, Vol. 9, pp. 623-650, 1999

[2] Tanner, F. X., "Liquid Jet Atomization and Droplet Breakup Modeling of Non-Evaporating Diesel Fuel Sprays," SAE Paper 970050, 1997.

[3] Tanner, F. X. and Weisser, G., "Simulation of Liquid Jet Atomization for Fuel Sprays by Means of a Cascade Drop Breakup Model," SAE Paper 980808, 1998.
TagsNo tags attached.

Activities

henry

2016-02-02 19:08

manager   ~0005882

Can you provide a patch to OpenFOAM-dev for this change or sponsor the development?

dkxls

2016-02-03 14:03

reporter   ~0005899

In short, I would suggest to leave the code as is and close this report.

I filed this bug report at a time when many things were broken in the Lagrangian spray library and I tried to get correct results for my spray simulations. The current implementation is probably not the best, but the whole atomization and break-up modeling is tricky altogether.

In my experience [1], one gets good results with an initial droplet size distribution (e.g. Rosin-Rammler) and an secondary breakup model (e.g. ETAB or KHRT), thus no explicit atomization model.


[1] A. Wehrfritz, V. Vuorinen, O. Kaario, M. Larmi, Large Eddy Simulation of High-Velocity Fuel Sprays: Studying Mesh Resolution and Breakup Model Effects for Spray A, Atomization and Sprays 23 (5) (2013) 419–442, doi:10.1615/AtomizSpr.2013007342.

Issue History

Date Modified Username Field Change
2013-09-08 15:01 dkxls New Issue
2013-09-09 09:07 user2 Severity major => feature
2016-02-02 19:08 henry Note Added: 0005882
2016-02-03 14:03 dkxls Note Added: 0005899
2016-02-03 14:15 henry Status new => closed
2016-02-03 14:15 henry Assigned To => henry
2016-02-03 14:15 henry Resolution open => suspended