Print Email Facebook Twitter Coarse level Newton-Krylov acceleration of sub-iterations in partitioned fluid-structure interaction Title Coarse level Newton-Krylov acceleration of sub-iterations in partitioned fluid-structure interaction Author Van Zuijlen, A.H. Bijl, H. Faculty Aerospace Engineering Department Aerodynamics, Wind Energy & Propulsion Date 2011-06-22 Abstract Computational fluid-structure interaction is 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. Reductions in computing times can be achieved by e.g. improving the convergence of the sub-iteration technique and/or performing sub-iterations on a coarse level, but also by improving the iterative solver used in the flow solver. In this paper we investigate the combination of a multilevel acceleration technique for sub-iterations which employs a Newton-Krylov solver on the coarse level to obtain high convergence for the correction term and a multigrid solver which performs only a limited amount of iterations on the fine level to reduce memory and computing requirements. For switching between a coarse grid correction and fine grid solve, an automated coarse grid ACG(r) selection algorithm is proposed. The algorithm is applied to an academic, two dimensional test case with incompressible flow. Compared to sub-iterating with a (memory intensive) JFNK algorithm on the fine mesh, the hybrid algorithm already requires 10% less computing time. When compared to sub-iterating with multigrid, the performance increase for the hybrid scheme is a factor 3. Subject high order time integrationfluid-structure interactionpartitioned integration To reference this document use: http://resolver.tudelft.nl/uuid:41be517e-979b-406a-b5cc-c214ec7958df Publisher CIMNE ISBN 978-84-89925-78-6 Source Coupled Problems 2011: Proceedings of the 4th International Conference on Computational Methods for Coupled Problems in Science and Engineering, Kos, Greece, 20-22 June 2011 Part of collection Institutional Repository Document type conference paper Rights (c) 2011 The Author(s) Files PDF vanZuijlen_2011.pdf 256.19 KB Close viewer /islandora/object/uuid:41be517e-979b-406a-b5cc-c214ec7958df/datastream/OBJ/view