Gallery

Simulation of granular flows

We consider in these simulations collections of rigid particles undergoing inelastic collisions without friction [1].

Random packing for nonconvex particles.
20 000 particles made of 2 spheres
[Faure, Lefebvre-Lepot, Semin], [5]
Flow around a sphere moving into a grain cloud.
300 000 spherical particles
[Seguin, Lefebvre-Lepot, Faure, Gondret], [8]
Sphere falling in a granular media
1 million of spheres
[Faure, Lefebvre-Lepot]
2D non-spherical particles
[Faure, Gouarin, Lefebvre-Lepot]
3D non-spherical particles
[Faure, Gouarin, Lefebvre-Lepot]

Gluey particles

In the simulations bellow, the rigid particules undergo gluey collisions (think of spheres coated with a thin layer of viscous fluid). This gluey contact model was developped in [2,3] to take into account the hydrodynamic singularity due to close particules in numerical simulation of suspensions (lubrication effects).

Sedimentation of gluey particles.
3 000 particles
[Lefebvre-Lepot], [2]
Concrete mixing.
2 500 particles
[Lefebvre-Lepot]

Red blood cells model

The following movies are simulations of a simplified red blood cells model. Each red blood cell is modelled by 11 rigid spheres, interacting through internal forces [4]. The red blood cells interact with each other through an attractive force. The fluid is modelled by a drag force.

Coagulation of red blood cells.
500 red blood cells (5 500 spheres)
[Faure, Lefebvre-Lepot]
Red blood cells in shear flow.
500 red blood cells (5 500 spheres)
[Faure, Lefebvre-Lepot]

Suspensions

Simulation of rigid particles suspended in a Stokes flow. The code is coupled with the fluid/particle solver CAFES developed by B. Fabrèges.

2D sedimentation of particles in Stokes flow.
1 000 spherical particles
[Fabreges]
3D sedimentation of particles in Stokes flow.
7 500 spherical particles
[Fabreges]

Crowd motion

Simulation of crowd evacuation using the model developed by B. Maury and J. Venel in [7].

Building evacuation.
500 individuals
[Venel]
Blocking during an evacuation.
[Faure, Venel]