Abstract
A partitioned implicit coupling strategy is proposed for fluid–structure interaction (FSI) problems in this paper. The incompressible Navier–Stokes equations under arbitrary Lagrangian–Eulerian description are solved by the characteristic-based split scheme while the structural equation is evaluated by the composite implicit time integration method. Moving submesh approach is performed for the mesh deformation and a mass source term (MST) is introduced into the pressure Poisson equation for respecting geometric conservation law. Fluid-structure coupling is achieved by the combined interface boundary condition (CIBC) method. The iterative loops are realized by fixed-point iterations with Aitken's Δ2 method. A structural force predictor is employed within the present algorithm, ensuring that the latest quantities belonging to different subdomains are adopted for the CIBC method. The proposed methodology is validated by flow-induced oscillations of a bluff body. The obtained results agree with the well-documented data. Some well-known flow phenomena have been detected successfully.
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