![]() Simulation of these flow features necessitates the use of a high order code exhibiting low numerical errors. This rotational motion implies azimuthal changes in blade aero/hydro-dynamics that result in complex flow phenomena such as stalled flows, vortex shedding and blade-vortex interactions. Simulation of this type of turbine for renewable energy generation needs to account for the rotational motion of the blades with respect to the fixed environment. This general purpose solver is used to provide insight into cross-flow (wind or tidal) turbine physical phenomena. "This thesis details the development, verification and validation of an unsteady unstructured high order (≥ 3) h/p Discontinuous Galerkin - Fourier solver for the incompressible Navier-Stokes equations on static and rotating meshes in two and three dimensions. Keywords: ICE2 train flow structures side wind LES train aerodynamics The time-averaged flow and the instantaneous flow around the ICE2 train at 30 degrees yaw angle are explored. They attach and detach from the surface of the train in a regular fashion. The second flow regime is the unsteady movement of the lower part of the wake vortices. It changes into unsteady shedding after a distance of about five train heights from their onset on the surface of the train. The first flow regime consists of steady vortex lines in the upper part of the wake flow. The LES results show that two flow regimes exist in the wake. Good agreement is obtained between the LES results and the experimental data. The results are also verified against available experimental data. The fine and the coarse meshes give similar results meaning that the results are mesh independent. Two computations on two different meshes with different numbers of nodes are made to check the effect of the mesh resolution on the results. The Reynolds number based on the height of the train and the free stream velocity is 2 x 10(5). Large-eddy simulation (LES) is conducted to investigate the flow around a simplified ICE2 train under side wind conditions at 30 degrees yaw angle. ![]()
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