DATA FROM DNS OF A SINGLE OBLATE SPHEROID SETTLING IN AMBIENT FLUID,
BENCHMARK USING SPECTRAL/SPECTRAL-ELEMENT METHOD AND MOVING GRID
# Flow configuration
The results contained in the data files correspond to a single
oblate spheroid with geometrical aspect ratio 1.1 or 1.5. Different
Galileo numbers ranging from 100 to 220 as well as different density
ratios can be found (see table below).
| caseid | chi | Ga | mstar | rhop/rhof | regime |
| `A11-M100` | 1.1 | 100 | 1.00 | 2.10 | Steady vertical |
| `B11-M100` | 1.1 | 115 | 1.00 | 2.10 | Steady oblique |
| `B15-M075` | 1.5 | 110 | 0.75 | 2.14 | Steady oblique |
| `C15-M075` | 1.5 | 150 | 0.75 | 2.14 | Vertical periodic |
| `D11-M100` | 1.1 | 200 | 1.00 | 2.10 | Chaotic |
| `D15-M500` | 1.5 | 220 | 5.00 | 14.32 | Chaotic |
The data presented here has been obtained with a spectral/spectral-element
method and is intended to be used for benchmarking purposes.
All quantities are made non-dimensional with the gravitational velocity Ug
and the equatorial diameter of the particle d. Note that the definition of
the gravitational velocity is `Ug=sqrt((rhop/rhof-1)*abs(g)*V/d^2)` and
the Galileo number `Ga=Ug*d/nu`.
# How to obtain the data
The entire data-set (including utilities and documentation) is
contained in the file "all_data_etc.tgz". Download and unpack it.
The provided Matlab script `matlab/test.m` can be used to generate
figures in a similar fashion as they are presented in the manuscript.
If the structure of the directories is the same as in the orginal
`tgz` file and the script `test.m` is called from the directory
`mfiles`, set 'caseid' to generate figures of any case presented
in the manuscript, e.g.:
>> caseid='A11-M100';
>> test;
If the script is called from a different path, set also `basedir`
to load the data from the path where the data is saved.
>> basedir='/path/to/the/data';
>> caseid='A11-M100';
>> test;
# Documentation:
Please check the document "doc/data-sheet.pdf". It contains basic
information and further pointers.
# References:
M. Moriche & M. Uhlmann, "A single oblate spheroid settling in
unbounded ambient fluid: a benchmark for simulations in steady
and unsteady wake regimes", submitted to Int. J. Multiphase Flow,
2020
Data repository at 4TU:
https://dx.doi.org/10.4121/13042793
# History:
Aug-07-2020 creation & data added
Nov-10-2020 small modifs in figure titles, data-set DOI added
# Contact
manuel.guerrero@kit.edu
markus.uhlmann@kit.edu