2026-04-17T03:08:23Zhttps://recercat.cat/oai/request

oai:recercat.cat:2117/4317492025-07-22T20:12:19Zcom_2072_1033col_2072_452951

00925njm 22002777a 4500 dc Sathy, Sri Sutharsan author 2025-05-26 This thesis presents a comprehensive investigation into turbulent channel flow using advanced numerical methods and high-order discretization techniques. The study focuses on both smooth and ribbed channel flows, with an emphasis on understanding the effects of surface roughness on turbulence characteristics. A spectral element method with higher polynomial orders was employed to solve the governing equations, ensuring accurate resolution of turbulent structures through p-refinement. The solver’s robustness and convergence were validated using direct numerical simulations (DNS) for high Reynolds number flows, referencing classical works by [Kim et al., 1987] and [Hoyas and Jiménez, 2008] The results demonstrate that ribbed channel flow exhibits distinct turbulence characteristics compared to smooth channels, with modified bottom wall structure leading to higher energy dissipation rates and altered vorticity distributions. The numerical framework successfully captured the energy cascade across scales, validating its applicability for studying complex turbulent flows. This research contributes to the field by advancing high-order numerical tools for turbulence modeling and providing insights into how rough surfaces influence turbulent dynamics. The findings underscore the potential of spectral element methods in accurately simulating and analyzing turbulent flows, offering a valuable framework for both academic research and industrial applications Àrees temàtiques de la UPC::Matemàtiques i estadística::Anàlisi numèrica Computational fluid dynamics Numerical analysis Dinàmica de fluids computacional Anàlisi numèrica Numerical studies of turbulent flow using high-order scale resolving simulations