Towards Scale-Resolving Simulations of Industrial Relevant Turbulent Flows
Speaker: Oriol Lehmkuhl, ANSYS, Inc.
Presentation
Abstract
The status of Large Eddy Simulations (LES) and its readiness for aerospace applications were recently discussed in the NASA CFD Vision 2030 report . The report recognized that LES with the aid of wall models as one of the pacing items ”for developing a visionary CFD capability required by the notional year 2030.” However, at the same time, the report stated that ”LES requires additional development of the wall-modeling capability that is currently at a very low technology-readiness level.” This criticism is legitimate, as the use of WMLES has been confined largely in academic research involving relatively low Reynolds number flows over essentially two-dimensional geometries, often having at least one direction of statistical homogeneity. This is hardly the case in real-world. In the last years, a significant effort has been done in BSC to increase the TRL level of LES by deploying low-dissipation strategies for the simulation of scale resolving turbulent flows into large scale applications. The talk will discuss the general strategy followed covering numerical methods, physical based sub-grid scale (SGS) closures, wall modelling and High Performance Computing (HPC) strategies. The current state in incompressible flows will be analyzed using canonical and industry-oriented cases like the high-lift JAXA standard model or the DrivAer car. Examples of the LES application in a real word project with Seat, wind farm resource assessment with Iberdola or active flow control for a full aircraft in stall from the EXCELLERAT CoE will be given.
Biography
