Numerical investigations on the vortex-induced vibration of moving square cylinder by using incompressible lattice Boltzmann method

• Flow with moving square cylinder was simulated numerically by using the incompressible lattice Boltzmann method.
• Strouhal number of the fixed cylinder is in consistent with the traditional CFD.
• The oscillation modes of moving square cylinder were related to the density ratio.
• Doubling of frequency exists between the longitudinal force and the lateral force.

Vortex-induced vibrations (VIV) phenomena related to self-excited energy harvesters consisting of square cylinders have been investigated numerically by using the BGK incompressible lattice Boltzmann method. In the present work, such a harvester is placed inside a channel flow and is allowed to oscillate without a structural restoring force in a direction normal to the flow. Currently the half-way bounce-back boundary and interpolations method are being used to model the moving boundary. The numerical results of the periodical and non-periodical oscillations and the frequency content of the longitudinal and lateral forces acting on the square cross section harvester are discussed in detail. The numerical technique was validated by computing the flow around a fixed cylinder. The results are compared favorably with the results obtained by classical CFD methods.