This is caused by the need to resolve very small\, yet dyna mically important flow structures found in the inner region of turbulent boundary layers (TBLs). To remove the restrictive resolution requiremen ts\, coupling LES with special models for the flow in the inner region h as been proposed. The predictive accuracy of this promising approach\, r eferred to as wall-modelled LES (WMLES)\, requires further analysis and validation.

\n\nIn this work\, systematic simulation campaigns of canonical wall-bounded flows have been conducted to support the developm ent of a complete methodology for highly accurate WMLES on unstructured grids. Two novel algebraic wall-stress models are also proposed and show n to be more robust and precise than the classical approaches of the sam e type. \;

\n\nFor turbulence simulations\, it is often challe nging to provide accurate conditions at the inflow boundaries of the dom ain. Here\, a novel methodology is proposed for generating an inflow TBL using a precursor simulation of turbulent channel flow. A procedure for determining the parameters of the precursor based on the Reynolds numbe r of the inflow TBL is given. The proposed method is robust and easy to implement\, and its accuracy is demonstrated to be on par with other sta te-of-the-art approaches. \;

\n\nTo make the above investigati ons possible\, several software packages have been developed in the cour se of the work on this thesis. This includes a Python package for post-p rocessing the flow simulation results\, a Python package for inflow gene ration methods\, and a library for WMLES based on the general-purpose so ftware for computational fluid dynamics OpenFOAM. All three codes are pu blicly released under an open-source licence to facilitate their use by other research groups.

\n DESCRIPTION:Large-eddy simulation (LES) is a highly accurate turbulence m odelling approach in which a wide range of spatial and temporal scales o f the flow are resolved. However\, LES becomes prohibitively computation ally expensive when applied to wall-bounded flows at high Reynolds numbe rs\, which are typical of many industrial applications. SUMMARY:Modelling Techniques for Large-Eddy Simulation of Wall-Bounded Tu rbulent Flows LOCATION:ITC 2446\, Lägerhyddsvägen 2\, Uppsala TZID:Europe/Stockholm DTSTART:20180921T101500 DTEND:20180921T235900 UID:20180921T101500-37594@uu.se END:VEVENT END:VCALENDAR