Lattice Boltzmann approach for acoustic manipulation.

Area of Science:

• Acoustics
• Computational Fluid Dynamics
• Physics

Background:

• Acoustic radiation force is crucial for manipulating micro-objects.
• Existing methods for calculating acoustic forces can be computationally intensive.
• Accurate simulation of acoustic radiation force is needed for applications in medicine and engineering.

Purpose of the Study:

• To develop a novel lattice Boltzmann method for computing acoustic radiation force.
• To validate the method against theoretical predictions for simple geometries.
• To demonstrate the method's potential for simulating complex acoustic manipulation phenomena.

Main Methods:

• Employed a lattice Boltzmann method (LBM) to model acoustic wave propagation.
• Used a kernel interpolation scheme to compute pressure and velocity perturbations on object surfaces.
• Calculated acoustic radiation force from these perturbations.

Main Results:

• The LBM accurately reproduced theoretical acoustic radiation forces for spheres (3D) and cylinders (2D).
• The method achieved high accuracy even with a limited number of lattice Boltzmann cells.
• The simulation successfully computed the acoustic radiation force for density-matched compressible objects.

Conclusions:

• The proposed lattice Boltzmann method is an effective tool for simulating acoustic radiation force.
• This method shows significant promise for applications such as acoustic tweezers and microswimmer manipulation.
• The approach offers a computationally efficient alternative for studying acoustic radiation force phenomena.