2026-04-17T05:55:47Zhttps://recercat.cat/oai/request

oai:recercat.cat:2117/3344172025-07-22T23:39:46Zcom_2072_1033col_2072_452951

Symmetry-preserving discretizations applied to Large-Eddy Simulation techniques in Navier-Stokes equations Plana Riu, Josep Àrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluids Turbulence--Simulation methods Navier-Stokes equations Eddies CFD Turbulence Large Eddy Simulation Finite Volume Method Turbulència -- Mètodes de simulació Equacions de Navier-Stokes Remolins (Mecànica de fluids) Direct Numerical Simulations of the incompressible Navier-Stokes equations for relatively high Reynolds numbers, as required for airfoils, are extremely expensive in terms of number of CPUs as well as processing time. Thus, small-scale modelling is a clever way to reduce this cost by introducing an extra dissipation in the form of a turbulent viscosity. In this thesis, the turbulence phenomenon is reviewed, from both theoretical and technical points of view, and applied to a turbulent Lid-Driven Cavity. In order to do so, different eddy viscosity models are applied in a Large Eddy Simulation formulation melded into a symmetrypreserving discretization that presents the optimal conditions for turbulence simulation. In fact, S3PQ model developed by CTTC is used and tested in a Lid-Driven Cavity at Re = 10000, provided its remarkable turbulent properties, in which the properties of a turbulent boundary layer are studied and compared to the theoretical approach, previously developed. 2020-09-28 Bachelor thesis http://creativecommons.org/licenses/by-nc-nd/3.0/es/ Open Access Attribution-NonCommercial-NoDerivs 3.0 Spain Universitat Politècnica de Catalunya