engleski

Composed Fluid-Structure Interaction Spatial Interface for Horizontal Axis Wind Turbine Rotor

In this paper we propose a technique for high-fidelity Fluid-Structure Interaction (FSI) spatial interface reconstruction, of a Horizontal Axis Wind Turbine (HAWT) rotor model composed of an elastic blade mounted on a rigid hub. The technique is aimed at enabling re-usage of existing blade Finite Element Method (FEM) models, now with high-fidelity fluid sub-domain methods relying on boundary-fitted mesh. The technique is based on the Partition of Unity method and it enables fluid sub-domain FSI interface mesh of different components to be smoothly connected. In the paper we use it to connect a beam FEM model to a rigid body, but the proposed technique is by no means restricted to any specific choice of numerical models for the structure components, or methods of their surface recoveries. To stress-test robustness of the connection technique we recover elastic blade surface from collinear mesh, and remark on repercussions of such a choice. For the HAWT blade recovery method itself we use Generalised Hermite Radial Basis Function Interpolation which utilises the interpolation of small rotations in addition to displacement data. Finally, for the composed structure we discuss consistent and conservative approaches to FSI spatial interface formulations.

Horizontal Axis Wind Turbine; Fluid–Structure Interaction Interface; Generalized Hermite Radial Basis Function Interpolation; Finite Volume Method

S.I.: Wind Turbine Modeling and Simulation.