Abstract
The document describes the CIRA and IBK collaborative research during the European Project UHURA. The latter aims to characterize the dynamic unsteady flow due to the deployment of a high-lift device at approach/landing conditions. The present work is devoted to the comprehension of the unsteady phenomena during the device motion by means of a coupled fluid-structure interaction (FSI) approach. In particular, the CIRA in-house immersed boundary (IB) code is extended to treat moving bodies and dynamic mesh refinements with the goal of simulating compressible and viscous flows around moving/deforming objects.The basic idea considers the motion of Lagrangian bodies through an inertial Cartesian mesh. Differently from classic moving-mesh approaches, the Cartesian cells do not move in space but rather they observe the solid walls crossing themselves. A moving least-square procedure (MLSQ) is used to build up a dynamic discrete forcing. The rigid body motion feature has been validated by simulating well-known benchmarks available in literature.A proper interface for coupling the IB method with a finite-element (FEM) solver is developed in the framework of a partitioned approach. In particular, the shared platform drives the solution sequence and allows exploring different coupling strategies. The aim is to simplify and automatize the study of complex flows whose characteristics strongly depends on the structural properties of moving objects. The final application deals with the FSI simulation of a high-lift device during its deployment phase.
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