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Title: A scalable nonlinear fluid–structure interaction solver based on a Schwarz preconditioner with isogeometric unstructured coarse spaces in 3D

Nonlinear fluid-structure interaction (FSI) problems on unstructured meshes in 3D appear many applications in science and engineering, such as vibration analysis of aircrafts and patient-specific diagnosis of cardiovascular diseases. In this work, we develop a highly scalable, parallel algorithmic and software framework for FSI problems consisting of a nonlinear fluid system and a nonlinear solid system, that are coupled monolithically. The FSI system is discretized by a stabilized finite element method in space and a fully implicit backward difference scheme in time. To solve the large, sparse system of nonlinear algebraic equations at each time step, we propose an inexact Newton-Krylov method together with a multilevel, smoothed Schwarz preconditioner with isogeometric coarse meshes generated by a geometry preserving coarsening algorithm. Here ''geometry'' includes the boundary of the computational domain and the wet interface between the fluid and the solid. We show numerically that the proposed algorithm and implementation are highly scalable in terms of the number of linear and nonlinear iterations and the total compute time on a supercomputer with more than 10,000 processor cores for several problems with hundreds of millions of unknowns.
 [1] ;  [2]
  1. Idaho National Lab. (INL), Idaho Falls, ID (United States). Modeling and Simulation
  2. Univ. of Colorado, Boulder, CO (United States). Dept. of Computer Science
Publication Date:
Report Number(s):
Journal ID: ISSN 0021-9991; PII: S0021999117302383
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Journal of Computational Physics
Additional Journal Information:
Journal Volume: 340; Journal Issue: C; Journal ID: ISSN 0021-9991
Research Org:
Idaho National Lab. (INL), Idaho Falls, ID (United States)
Sponsoring Org:
USDOE Office of Nuclear Energy (NE)
Country of Publication:
United States
97 MATHEMATICS AND COMPUTING; isogeometric coarse mesh; Newton-Krylov-Schwarz; Nonlinear fluid-structure interaction; parallel software development; unstructured mesh
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1413567