The aim of the present numerical study is to show that the recently
developed Alternating Direction Reconstruction Immersed Boundary
Method (ADR-IBM) [1] can be used for Fluid-Structure Interaction (FSI)
problems and can be combined with an Actuator Line Model (ALM)
and a Computer-Aided Design (CAD) interface for high-fidelity simulations of fluid flow problems with rotors and geometrically complex
immersed objects. The method relies on 1D cubic spline interpolations to reconstruct an artificial flow field inside the immersed object
while imposing the appropriate boundary conditions on the boundaries
of the object. The new capabilities of the method are demonstrated
with the following flow configurations: a turbulent channel flow with
the wall modelled as an immersed boundary, Vortex Induced Vibrations (VIVs) of one-degree-of-freedom (2D) and two-degree-of-freedom
(3D) cylinders, a helicopter rotor and a multi-rotor unmanned aerial
vehicle in hover and forward motion. These simulations are performed with the high-order fluid flow solver Incompact3d which is based on
a 2D domain decomposition in order to exploit modern CPU-based
supercomputers. It is shown that the ADR-IBM can be used for the
study of FSI problems and for high-fidelity simulations of incompressible turbulent flows around moving complex objects with rotors.