Abstract
Turbulent flows are characterised by the presence of 'fluctuating scales', or 'structures' of varying magnitude whose effects on mixing, heat transfer and energy dissipation are prominent. The main objective of the study is to explore and exploit two-equation models capable of numerically analysing the dynamic and thermal behaviour of unsteady turbulent incompressible flows, focusing on the variation of temperatures and the rate of turbulent dissipation in a hydraulic structure of complex geometry with its obstacles, erected along the axis of the open channel. The complexity of the physical phenomena taking place in the circular tunnel and the trapezoidal open channel was also emphasised. The work also includes the various numerical simulations that we were able to carry out using the FUENT software, which allowed us to visualise the vortex structures and the energy dissipation. The simulations were carried out using the Reynolds-averaged Navier–Stokes (RANS) model using the closure models: k-ε, RNG k-ε, SST k-ω and K-ω. This model was chosen because it is less expensive in terms of computational time than Direct numerical simulation and large-scale simulations have a very wide range of applications, including heat transfer. The resolution of the incompressible Navier–Stokes equations governing these flows is carried out with the finite volume method, the use of which is particularly motivated by its ability to handle complex geometries. All the simulations were carried out using the FLUENT software, which allowed us to explore, among other things, the turbulent kinetic energy and the temperature distribution in the set-up.
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Khanfouf, O., Fourar, F.Z., Fourar, A. et al. Influence of model selection on the temperature field and turbulent energy dissipation rate in a hydraulic system with a complex geometry. Model. Earth Syst. Environ. 9, 2125–2139 (2023). https://doi.org/10.1007/s40808-022-01591-4
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DOI: https://doi.org/10.1007/s40808-022-01591-4