Effects of oscillated wall on the turbulent structure and heat transfer of three-dimensional wall jet

Abstract

In this research, a three-dimensional turbulent wall jet was modeled using an Improved Delayed Detached Eddy Simulation to examine its flow and thermal properties. The accuracy of the simulation was confirmed by comparing key flow characteristics with experimental data. The study involved introducing an oscillating wall and a hot wall within the computational domain to observe their effects on thermal behavior and turbulence structure. OpenFOAM v2012 was utilized for the simulations based on a 3D channel design. The turbulent structure exhibited distinct separated, small-scale, and large-scale turbulence within the domain. The findings indicated that reducing the computational domain height increased the Nusselt number, and positioning the hot wall near the core of the jet also increased the Nusselt number. Additionally, increasing the frequency and amplitude of the oscillating wall resulted in a higher Nusselt number. These results contribute to a deeper understanding of the fluid physics in this specific scenario and can enhance knowledge in the fields of solid and turbulence fluid structure interaction. The analysis of the turbulence structure revealed that a lower domain height created elongated turbulence structures, and placing the hot wall at the end of the computational domain had less impact on smoothing the turbulence structures due to the presence of very strong, large turbulence structures.