Difference between revisions of "Archer Gallery"

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(Atomisation)
(Atomisation)
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== Atomisation ==
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= Atomisation =
 
=== Turbulent jet ===
 
=== Turbulent jet ===
 
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<div class="infobox floatright" style="width: 500px;">

Revision as of 19:31, 20 April 2020


Atomisation

Turbulent jet

Jet 2048.jpg


Diesel type Jet Atomization : Diameter: 100µm, Liquid velocity 100 ms-1, Turbulence 5%, gas velocity: 0 ms-1, =696 kgm-3, =25 kgm-3

=1.210-3kgm-1s-1, =10-5kgm-1s-1, =0.06Nm-1 Numerical simulation by coupling Level Set / VOF / Ghost fluid methods

Mesh : 256x256x2048 (130 millions points) MPI parallelization 128 procs.


Triple disk injector

Mesh intern LES.png
Velocity.png
Triple.png


  • Coupling between internal flow simulations and DNS of primary breakup
  • Radius of the jet exit: 90 microns
  • Mesh 256x1024x1024 (~270 millions) dx~1.44 micron
  • ~3000 nodes on the (half) jet exit
  • 2048 procs
  • Triple.avi




Liquid/Gas mixing layer

thumb
Couche2.png
Nappe.png
  • Air/water mixing layer
  • 30m/s in air, 0.3 in water
  • Grid is 512x512x1024 nodes
  • Mesh size equals 48 µm.
  • 2048 procs, 20 hours for 3500 time steps; Simulation on 70000 time steps, dt~=10-6 s




Air assisted atomization

0193.jpeg
  • Air/water Jet « Marmottant » Modified Rudman's method two grids
  • Ugas=35m/s and Uliq=0.2m/s
  • =1,2 kg/m3 =1000 kg/m3
  • Lx=45.6mm (4mm+1.7mm)x8 that is 4 the « jet +gas » diameter
  • Grid: 256x256x256,(512x512x512 for level set and VOF, mesh is 90µm)
  • 1024 procs on Curie, 12h wall-clock for 5000 time steps.
  • Simulation is 250000 time steps.
  • Marmotte.avi

2D gas/liquid shear layer

9 11.jpeg
  • M=^2 / ^2 = 16
  • Ugas=30 m/s Uliq=0.26 m/s
  • =1,2 kg/m3 =1000 kg/m3
  • Lx=80mm, Ly=40 mm 10mm water + 10mm air + 20mm quiet
  • Grid: 1024x512(that is 2048x1024 level set and VOF, mesh is 40 µm)
  • 512 procs on Curie
  • 18h wall clock for 100000 time steps.
  • Simulation on 2 000 000 time steps
  • 2Dliquid_shear_layer.avi



Air assisted atomization

Ite304.jpg
  • Air/water Jet « Marmottant » RUDMAN-TYPE Technique with one grid
  • Ugas=22.6m/s and Uliq=0.27m/s
  • =1,2 kg/m3 =1000 kg/m3
  • Lx=34.2mm (4mm+1.7mm)x6 that is 3 x the « jet +gas » diameter
  • Grid: 256x256x256,(mesh is 134µm)
  • 512 procs on Curie, 12h wall-clock for 30000 time steps.
  • Grid: 512x512x512
  • Grid: 512x512x1024
  • 8192 procs on TURING, 16h wall clock for 6000 time steps.
  • Marmotte.avi

Air assisted atomization

Im1000.jpg
  • Same configuration
  • Initial boundary layers included
  • Grid:512x512x1024
  • Oct_15_2015.avi
  • Helicoïdal behaviourin simulations (experimentally observed)
  • helicoid.avi