报告题目：Isogeometric Methods for Partitioned Fluid–Structure Interaction with Large Deformations

报 告 人：Jingya Li/李菁雅 (Delft University of Technology)

报告时间：2026年10月19日（星期一）15:00—16:00

报告地点：数学科学学院115（大报告厅）  

校内联系人：朱春钢 教授        联系方式：84708351-8618

报告摘要：In body-fitted fluid–structure interaction (FSI), the fluid mesh conforms to the moving structural boundary, accurately representing the interface but risking mesh distortion under large deformations. Isogeometric analysis (IGA) maximizes the benefits of body-fitted meshes through exact spline representations of curved interfaces and smooth solution fields for evaluating interface tractions. As a first step, we develop a spline-based coupling approach for partitioned FSI that exchanges interface geometry and physical fields through spline coefficients and basis information, supporting different solver discretizations while preserving exact geometry and higher-order continuity in IGA-to-IGA coupling. Implemented with G+Smo and preCICE, this spline-based exchange reduces the amount of communicated data compared with pointwise interface sampling in the investigated configurations. Building on this exchange, we introduce a parameterization-driven arbitrary Lagrangian–Eulerian (ALE) formulation that constructs a new multi-patch spline parameterization of the fluid domain from the current interface geometry at each time step, avoiding accumulated distortion from incremental mesh deformation. A constant-preserving quasi-interpolation operator transfers solution fields between successive parameterizations, which support both IGA and conventional finite element fluid solvers. Validation on the Turek–Hron FSI2 and perpendicular-flap benchmarks reproduces published responses. Translating-sphere and rotating-square benchmarks demonstrate robustness under large boundary motions, including continuous rotation beyond the range of traditional ALE mesh-deformation methods. A three-dimensional rotor simulation further demonstrates applicability to complex rotating geometry.

报告人简介：Jingya Li is a PhD researcher in the Department of Applied Mathematics at Delft University of Technology, the Netherlands. Her research focuses on fluid–structure interaction, with particular emphasis on partitioned coupling through spline-based and variationally consistent interface methods for non-matching discretizations, isogeometric analysis, and arbitrary Lagrangian–Eulerian (ALE) methods for large structural deformations.