Modeling Ferrofluid Sloshing Vibration Energy Harvesting Using Level-Set Method
Ferrofluid sloshing vibration energy harvesters are the recent addition in the domain of vibration energy harvesting systems. These systems are unique in their use of a liquid state transduction mechanism to harvest ambient vibrations/oscillations to generate electric power. In this paper, a 2-D representation of one such system is numerically simulated. The simulation consists of interface tracking between air and ferrofluid via the level-set method, modeling permanent magnets using the AC/DC Module, and the general incompressible Navier-Stokes equations using the CFD Module. To establish the accuracy of the simulation, grid convergence studies are performed. Secondly, additional validation of numerical algorithms in COMSOL® is performed by mimicking a published experimental configuration for Ferrofluid Vibration Energy Harvesting. The extracted RMS voltages from the experimental results and COMSOL® numerical simulation agree within 5% of the variance. Finally, the proposed system with four permanent magnets is analyzed for max power and voltage using impedance matching.