Efficiency of fluid-structure interaction simulations with adaptive underrelaxation and multigrid acceleration

Efficiency and accuracy of fluid-structure interaction simulations using an implicit partitioned approach

“…4) must be considered. How this can be done for a finite volume solver using the SIMPLE-method is described in detail in [28].…”

“…In Table 3 the results are summarized. The Aitken method reduces the computing time by nearly a factor of 2. Notable are the superposition effects of the multigrid and the adaptive Aitken methods, leading to an acceleration of around 15 (see also [28]). …”

“…The present paper can be viewed as a survey and summary of the developed enhanced methods. The implementation of multigrid methods with moving meshes into the SIMPLE-algorithm is described in detail in [28] as well as the involvement of the Aitken underrelaxation scheme. The ideas of the grid movement techniques and their influence to results and efficiency is outlined in [29].…”

Experimental and numerical study on a laminar fluid–structure interaction reference test case

“…Due to the two-dimensional assumption, symmetry boundary conditions are applied at z= 790 mm. For acceleration, a geometric two-level multi-grid approach is employed for the fluid domain; see Yigit et al (2007). The time step size is Dt ¼ 0:001 s, the FSI under-relaxation is a FSI ¼ 0:008, the under-relaxation for u, v, w is 0.7 and for mass conservation 0.3.…”

An Eulerian approach for partitioned fluid–structure simulations on Cartesian grids

“…The coupling process is controlled by a central client and the simulation applications act as servers component only. Furthermore, the central coupling client is the natural location for the implementation of more sophisticated-and, thus, more complex-FSI schemes such as Krylov methods [23], reduced order models [31], or interfield multigrid algorithms [3,34].…”