Abstract
Understanding the interplay between gravity modulation and natural convection is crucial in various fluid dynamic applications. This study investigates the impact of microgravity modulations on free convection within a closed cavity, expanding upon previous research focused on low-frequency oscillations. Employing the Lattice Boltzmann method, we analyze scenarios where oscillation frequencies exceed the system's natural frequency, utilizing fast Fourier transformation to discern dominant oscillation modes. Our examination reveals significant influences of variable gravity on thermal and momentum transport, with inertia and viscosity assuming pivotal roles. As frequency ratios increase, viscous induction effects overshadow force contributions, reshaping flow dynamics. Lower frequencies generate dominant circulations, while higher frequencies manifest as smaller circulations, predominantly affecting heat transfer through conduction. Intriguingly, higher frequencies give rise to longitudinal behaviors, whose occurrences correspond to the frequency ratio. Despite the chaotic flow patterns observed at higher frequencies, heat transfer remains primarily governed by fluid conductivity, underscoring the nuanced interplay between gravity modulation and fluid dynamics. These insights hold implications for optimizing thermal management across diverse applications.