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Movie Gallery

These are sample results of direct, large-eddy, and molecular dynamics simulations
All simulations are three-dimensional and time-dependent


A void (bubble) meandering through a thin liquid-fluidized bed
periodic domain in all directions
particle-resolved simulation
bubbble.mp4    Download ("Save link as") 21 Mb

                                                                                              


















A dense cylinder falls in a losely packed bed of light spheres
solid-liquid system; periodic domain in lateral directions
vcyl.mp4             Download 20 Mb

                                                                                              

















Vortex shedding by flexible cylinder
contours denote vorticity; periodic domain
a2_2e_001.mp4             Download 2.5 Mb

                                                                                              













Covid-19
spreading of micro-droplets after a sneeze
sneeze.mp4             Download 5.5 Mb

                                                                                              













Flexible (bendable) cylinders in a mixing tank
colors indicate velocity magnitude in the mid-plane

                                                                                              pbt_d4b2.mp4     Download 5 Mb












                                                                       Agitating cylinder-shaped particles
                                                                       in the laminar flow driven by a spinning disk
                                                                                              e2b3a.mp4     Download 5 Mb









 Interaction between solids and liquid motion
in a solids-suspension process
 only the particles in a thin slab are shown
the contours indicate velocity magnitude of the interstitial liquid

left: mono-sized particles
 solids_cone.mpg Download 49 Mb

right: particles have a size distribution
 psd.mp4 Download 30 Mb









 MD simulations of a liquid bridge
green: solid; red: vapor; yellow: liquid

Left: steady state
lqb.mpg Download 13 Mb

Right: stretching and rupturing
lqb_rup2.mpg Download 41 Mb










 Solid to liquid mass transfer in a micro-fluidized bed
mono-sized spheres; colors: scalar concentration
Schmidt number: 10,000
fun0b4_3.mpg Download 4 Mb


























 Start-up of solids suspension in a small stirred tank
fully resolved simulation
impeller Reynolds number is 2000
solid over liquid density ratio is 2.5
the contours in the mid-plane indicate the liquid velocity
dnsss.mpg Download 175 Mb


Sheared granular bed under a mildly turbulent flow
fully resolved spheres
spheres colored by  their streamwise velocity
the contours in the end plane indicate the liquid velocity
tshlds.mpg Download 25 Mb

Sheared granular bed
solid particle motion as a result of a laminar liquid shear flow above the particle bed
spheres colored by  their streamwise velocity
shgb.mpg Download 42 Mb













 

Sedimentation and flocculation in a solid-liquid suspension
fully periodic boundary conditions; gravity down, pressure gradient up
spheres colored by the size of the aggregate they are part of
flocs.mpg Download 144 Mb













 

Sedimentation of red-blood-cell-shaped particles through liquid
collision handling is a challenge when dealing with dense suspensions of non-spherical particles
work by Orest Shardt
rbc_settling.avi  Download 36 Mb

Agglomeration & de-agglomeration in shear flow
spheres interact through a square-well potential; colors denote liquid velocity
sqwp_shr.mpg  Download 11.5 Mb

Startup of turbulent solids suspension
side views      
work by Inci Ayranci
side_exp.avi  Download 6.7 Mb  side_sim.mpg  Download 75.2 Mb


Particles in Bingham liquid mobilized by agitation
particles colored by their speed
bingprt.mpg  Download 7.8 Mb

Fiber stretching and folding in shear flow
the fiber is modelled as spheres connected through hinges
sheared_fiber.mpg  Download 6.7 Mb

Scalar mixing by granular particles
colors indicate scalar concentration
granmix.mpg  Download 1.5 Mb

Mixing by fluidized particles in a micro-channel
the channel-based Reynolds numbers is 12
colors indicate scalar concentration
microfluidization.mpg  Download 6 Mb

LES of scalar mixing in a stirred tank
left: vertical cross section
right: horizontal
colors indicate scalar concentration
scalar mixing.mpg  Download 13 Mb



Solid-liquid suspension in a stirred tank 
vertical cross-section through 3D domain
Ruhton turbine, baffled tank
solid_liquid_mixing.avi Download 17 Mb 
Particles dissolving in a turbulently stirred tank
vertical cross-section; colors indicate particle size
work done by Hugo Hartmann
dissolution.avi Download 46 Mb











In unbaffled mixing tanks particles tend to demix
side view
unbaffled_demixing.mpg Download 71 Mb
Vortex breakdown in a contracting, strongly swirling flow
cross-section, colors are velocity magnitude
vortex_breakdown.mpg Download  1.5 Mb











Gas-solid separation in a cyclone separator
blue: large particles, red: small particles
gas_cyclone.mpg Download 13 Mb

Sphere sedimenting in a closed container
left: lattice-Boltzmann simulation, rigth: PIV experiment
colors indicate the absolute value of the velocity
work done by Andreas ten Cate and Kees Nieuwstad
sedimenting_sphere_exp_lb.avi Download  28 Mb

Spherical particles resuspending in a turbulent shear flow
cross-section through a 3D domain
all spheres have the same size
colors indicate absolute value of the fluid velocity
resuspension.mpg Download  22 Mb

DNS of void formation in a liquid-fluidized bed
gravity points to the left
periodic boundary conditions in all three dimensions
initial condition is a planar wave instability
fluidization.mpg Download  9.5  Mb

Ordering of a high-Stokes number solid-liquid suspension under shear
uniformely sized particles
cross section through 3D domain
solids volume fraction is 55%
colors indicate absolute value of fluid velocity
shear_induced_ordering.mpg Download  66 Mb

Liquid-liquid dispersion undergoing a turbulent burst
cross section through fully periodic 3D domain
turbulent_dispersion.mpg Download  3.5 Mb