Speaker: Zhu Chi, researcher and PhD supervisor, Peking University

Date: August 23, 2023

Time: 9:30-10:30

Location: B924, Zhixin Building, Shandong University

Sponsor: The School of Mathematics, Shandong University

Abstract:

In this talk, a graph-partitioning framework for a sharp-interface immersed boundary method is proposed S0 as to increase its computational efficiency for simulating internal flows on large-scale parallel computers. Immersed boundary methods are generally inefficient for internal flows with complex geometries due to the larger proportion of grid points that fall outside the fluid domain for such configurations. The graph-partitioning framework proposed here enables the solver to effectively ignore these points and focus the computation on the active points inside the fluid domain. A novel coarsening-partitioning process is proposed to ensure that sufficient overlapping layers are available at the sub-domain interfaces to accommodate computational stencils associated with the discretization as well as the sharp-interface boundary conditions. The benchmark test shows that the adoption of the graph topology reduces the computational cost (wall-time and memory cost) substantially. Moreover, the computational cost is shown to only scale with the number of computationally active grid points. The capability of the graph-partitioned solver is further demonstrated by simulating the flow inside an arterial network, a configuration that would otherwise be out of reach for most immersed boundary methods.

For more information, please visit:

https://www.view.sdu.edu.cn/info/1020/182839.htm