Click in each of the following items to see images and videos of simulations made by the LBSim software.

Von Karman Vortex Street

Von Karman vortex street, with different visualizations. The images show the velocity and pressure fields. There is also a visualization showing particles injected continuously at the inlet. The relaxation parameter is 0.55 and the inlet velocity is 0.2. In the last two images, the relaxation parameter is set to 0.51, increasing the Reynolds number.

Porous Media

Simulation of a porous media. The solid density is changed during the simulation. The used values are: 0.1, 0.01 and 0.001.


A multiphase simulation, with the formation of bubbles. It is possible to see the density and the forces fields. The minimization of the surface implies the appearing of circular structures.


The first three images present a simulation of droplet generation, with two imiscible fluids. After that, it is shown a series of multicomponent simulations, with many different contact angles obtained from the adjustment of the parameters of the Shan Chen model (Huang, 2007).
gads1 = -0.4 gads2 = 0.4 gads1 = -0.3 gads2 = 0.3 gads1 = -0.2 gads2 = 0.2 gads1 = -0.1 gads2 = 0.1 gads1 = gads2 = 0 gads1 = 0.1 gads2 = -0.1 gads1 = 0.2 gads2 = -0.2 gads1 = 0.3 gads2 = -0.3 gads1 = 0.4 gads2 = -0.4


Here, some applications in microfluidics are presented. First, a droplet generator is shown. The interior inlet has a senoidal variation of pressure, generating droplets. Second, a simulation of a microstructure is simulated. There are two inlets (at the left of the domain). At the top inlet, the velocity is configured to be the double of the bottom inlet. The last image is a simulation of convection (advection + diffusion) of tracers of an y shaped microchannel.

Passive Scalar (Thermal and Diffusion)

A passive scalar approach is implemented by the program. This technique can be used for thermal simulations and other diffusion processes. The first images were generated from a simulation of walls at different temperatures, generating the Rayleigh-Benard convection, by the action of the gravity. The first image shows the isotherms, the next presents the velocity module field and the next three shows the velocity field. The next images presents a simulation of a diffusion of the concentration of a solute in a solvent (initially at the center of the domain). The timesteps are: 100, 200, 400, 800, 1600 and 3200. More information about this case can be obtained in the Sukop's book.

Moving Particles

These images present a simulation in which an external force is applied on a moving particle. The fluid is at rest and the moving particle causes an effect in fluid. The first image shows the velocity module, the second one, the pressure field and the third one is the velocity field around the moving particle.

Changing the Reynolds Number

This simulation presents the flow around a squared obstacle. The relaxation parameter and the inlet velocity are modified during the simulation. In this way, it is possible to see the effects of the Reynolds number on the flow.


Some applications of acoustics are shown here. For detailed information, see the Viggen's thesis.

Last but not Least

This section presents some miscellaneous simulations provided by the LBSim software.