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In this paper some results on the convergence of the Gauss–Seidel iteration when solving fluid/structure interaction problems with strong coupling via fixed point iteration are presented. The flow-induced vibration of a flat plate aligned with the flow direction at supersonic Mach number is studied. The precision of different predictor schemes and the influence of the partitioned strong coupling on stability is discussed. [Copyright &y& Elsevier]

This work describes a formulation for the treatment of submerged rigid solids within the framework of the finite volume method. The proposal consists in considering the solid as a porous region and the hydrodynamic forces that arise from the Darcy terms. The methodology is implemented in an open code that allows large-scale calculations. In the present work, we present the methodology and its verification using cases of study, to demonstrate spatio-temporal numerical convergence and the accuracy of the imposition of boundary conditions. For this purpose, cases that have an analytical solution are analyzed, such as the Pouiseuille flow, the first and second Stokes problems, and immersed walls that move with imposed movement generating different pressures between both faces. A moving cylinder analysis is shown to validate the numerical technique in comparison with cases reported in the literature. The analysis leads to stability conditions against external parameters such as permeability. The ability of the method to represent moving walls and immersed bodies with imposed movement is established. • An embedded finite volume formulation is proposed for rigid solids interacting with fluids. • Boundary conditions varying in space and time are easily imposed. • Simple and precise calculation of the hydrodynamic forces. • Satisfactory validation of the hydrodynamic coefficients. • Optimal relation between model parameter and time step and mesh size to obtain convergence. [ABSTRACT FROM AUTHOR]

This research work evaluates the performance of a Fluid–Structure Interaction (FSI) solver, which is created using a generic interface to couple two independent software packages. The basic idea is to combine the advantages of the two independent codes to create a powerful FSI solver for two and three dimensional FSI analysis using the concept of modular programming. A detailed description about the implementation of an interface to couple a three-field system involved in the analysis is given, and this developed interface can be generalized to others codes. Since solving complex FSI problems is very time consuming, the focus of this work is placed on the performance of the coupled solver, for which a FSI benchmark will be solved on a computer cluster in order to measure speed up and efficiency. [ABSTRACT FROM AUTHOR]

A Navier–Stokes solver based on Cartesian structured finite volume discretization with embedded bodies is presented. Fluid structure interaction with solid bodies is performed with an explicit partitioned strategy. The Navier–Stokes equations are solved in the whole domain via a Semi-Implicit Method for Pressure Linked Equations (SIMPLE) using a colocated finite volume scheme, stabilized via the Rhie–Chow discretization. As uniform Cartesian grids are used, the solid interface usually do not coincide with the mesh, and then a second order Immersed Boundary Method is proposed, in order to avoid the loss of precision due to the staircase representation of the surface. This fact also affects the computation of fluid forces on the solid wall and, accordingly, the results in the fluid–structure analysis. In the present work, first and second order approximations for computing the fluid forces at the interface are studied and compared. The solver is specially oriented to General Purpose Graphic Processing Units (GPGPU) hardware and the efficiency is discussed. Moreover, a novel submerged buoy experiment is also reported. The experiment consists of a sphere with positive buoyancy fully submerged in a cubic tank, subject to harmonic displacements imposed by a shake table. The sphere is attached to the bottom of the tank with a string. The position of the buoy is determined from video records with a Motion Capture algorithm. The obtained amplitude and phase curves allow a precise determination of the added mass and drag forces. Due to this aspect the experimental data can be of interest for comparison with other fluid–structure interaction codes. Finally, the numerical results are compared with the experiments, and allow the confirmation of the numerically predicted drag and added mass of the body. [ABSTRACT FROM AUTHOR]