Multi-Level Acceleration for Sub-Iterations in Partitioned Fluid-Structure Interaction

Multi-Level Acceleration for Sub-Iterations in Partitioned Fluid-Structure Interaction

Van Zuijlen, A.H.
Bijl, H.

Aerospace Engineering

2009-09-09

Computational fluid-structure interaction is most commonly performed using a partitioned approach. For strongly coupled problems sub-iterations are required, increasing computational time as flow and structure have to be resolved multiple times every time step. Many sub-iteration techniques exist that improve robustness and convergence, although still a flow and structure have to be solved a number of times every time step.In this paper we apply a multi-level acceleration technique, which is based on the presumed existing multi-grid solver for the flow domain, to a two-dimensional strongly coupled laminar and turbulent problem and investigate the combination of multi-level acceleration with the Aitken underrelaxation technique. It is found that the value for the underrelaxation parameter is not significantly different when performing sub-iterations purely on the coarse level or purely on the fine level. Therefore coarse and fine level sub-iterations are used alternatingly, where it is found that performing 3 or 4 coarse level sub-iterations followed by 1 fine level sub-iteration resulted in the highest gain in efficiency. Although the total number of sub-iterations increases slightly by 25–30%, the number of fine grid iterations can be decreased by as much as 65–70%.

computational fluid dynamics
optimisation
finite volume methods

http://resolver.tudelft.nl/uuid:48acad55-f0d8-4f02-b8b5-fda935fa60a1

https://doi.org/10.1063/1.3241333

American Institute of Physics

http://link.aip.org/link/?APCPCS/1168/1347/1

AIP Conference Proceedings, 1168 (2), Numerical Analysis and Applied Mathematics, International Conference 2009

Institutional Repository

conference paper

(c) 2009 Van Zuijlen, A.H.; Bijl, H.; American Institute of Physics