Akademik Veri Yönetim Sistemi
Journal of the Faculty of Engineering and Architecture of Gazi University, cilt.39, sa.4, ss.2209-2221, 2024 (SCI-Expanded)
The purpose of this study is the develop an algorithm that guarantees the accuracy of an LES solution with a correct strategy in the absence of experimental data. The method adopted is different from the grid-independent analyses previously performed using multiple and different grid structures for the resolution adequacy of LES. In the proposal, which is based on the temporal and dimensional comparison of the Integral, Kolmogorov and Taylor Scales and the scale that characterizes the cell size, the information about resolution adequacy was obtained before proceeding the LES solution. For the referenced U-duct flow problem, the proposal has been validated with the available experimental data.According to the suggestions and validation results presented, it was interpreted that the velocities in the direction of the main flow and perpendicular to the main flow were calculated correctly. Therefore, the proposal was sufficient for the determination of the first-order flow statistics. It was observed that the acceleration in the inner wall, the deceleration in the outer wall, the flow separation near the inner wall, and the formation and development of counterflow in the U-duct were accurately captured in the current LES analysis. When the root-mean-square values of the velocity fluctuations in the direction of the main flow and perpendicular to the main flow, which are the second-order flow statistics parameters, are examined, it is understood that the results are promising and acceptable. It has been shown that the resolution adequacy proposed for the LES in this study is easy to implement, fast, and reliable.