Acoustic Levitation Simulation

Hi

There is a tutorial model of "Acoustic Levitation" on the website, simulating the levitation using particle tracing for fluid flow. I want to simulate the levitation of a sphere (of diameter close to wavelength). How can I do it? I tried modifying the properties of particles in fpt but still there are many particles. I want a single sphere and a time-dependent solution of it. Which physics do I need?

Thanks