Methods for simulation-based analysis of fluid-structure interaction.

Abstract

Methods for analysis of fluid-structure interaction using high fidelity simulations are critically reviewed. First, a literature review of modern numerical techniques for simulation of aeroelastic phenomena is presented. The review focuses on methods contained within the arbitrary Lagrangian-Eulerian (ALE) framework for coupling computational fluid dynamics codes to computational structural mechanics codes. The review treats mesh movement algorithms, the role of the geometric conservation law, time advancement schemes, wetted surface interface strategies, and some representative applications. The complexity and computational expense of coupled NavierStokes/structural dynamics simulations points to the need for reduced order modeling to facilitate parametric analysis. The proper orthogonal decomposition (POD)/Galerkin projection approach for building a reduced order model (ROM) is presented, along with ideas for extension of the methodology to allow construction of ROMs based on data generated from ALE simulations.3

Thermo-Mechanical Finite Element Analysis/Computational Fluid Dynamics Coupling of an Interstage Seal Cavity Using Torsional Spring Analogy

“…The comprehensive review of Barone & Payne [31] suggests the "torsional spring analogy" is the best compromise between the quality of the final mesh achievable and the computational cost required. For completeness, a description of the method is given in next subsection.…”

Validation of CFD‐CSD coupling interface methodology using commercial codes

“…The first approach is known as monolithic or directly coupled approach, see References [4,5], in this approach the equations of motion for fluid and structure are solved as single set of equations in a unified or a single solver. Advantage of monolithic approach is that as the solution is marched forward in time the fluid and structure parameters are fully synchronized for each time step.…”

“…The second approach is known as partitioned approach [4] in which the fluid and structure equations of motion are solved in separate domain-specific solvers and the coupling is provided by an interface (coupling interface) which helps in exchange of information between the two domains solver. The advantage of this approach is that available solvers for these two separate domains can be used, which have been verified and validated in their specific problem domains.…”

“…If this conservation of flow is violated then spurious mass, momentum and energy values 489 will appear in the numerical simulation, rendering the whole exercise futile. The conservation of flow in the moving mesh or deforming CFD grid can be guaranteed by satisfying the following relationship [21]:…”

“…To reduce this time lag, time step size, for the loosely coupled scheme, has to be reduced as compared with the fully coupled scheme. Though numerical experiments carried out, using loosely coupled scheme, for flutter and other aeroelastic phenomena have shown practically insignificant differences [4] from fully coupled scheme. One more advantage of using the loosely coupled partitioned scheme is that the solvers can be executed on parallel computers quite easily.…”