04 Apr 2022
04 Apr 2022
Status: this preprint is open for discussion.

Block-structured, equal workload, multigrid nesting interface for Boussinesq wave model FUNWAVE-TVD

Young-Kwang Choi1,2, Fengyan Shi1, Matt Malej3, Jane M. Smith3, James T. Kirby1, and Stephan Grilli4 Young-Kwang Choi et al.
  • 1Center for Applied Coastal Research, University of Delaware
  • 2Task Force for Construction of RV ISABU Support Facility, Korea Institute of Ocean Science and Technology, Busan Metropolitan City, Republic of Korea
  • 3U.S. Army Engineer Research and Development Center, Coastal and Hydraulics Laboratory, 3909 Halls Ferry Road, Vicksburg, MS 39180, USA
  • 4Department of Ocean Engineering, University of Rhode Island, Narragansett, RI 20882, USA

Abstract. We describe the development of a block-structured, equal CPU-load, multigrid nesting interface for the Boussinesq wave model FUNWAVE-TVD. The new model framework does not interfere with the core solver, and thus the core program, FUNWAVE-TVD, is still a stand-alone model used for a single grid. The nesting interface manages the time sequencing and two-way nesting processes between the parent grid and child grid with grid refinement in a hierarchical manner. Workload balance in the MPI-based parallelization is handled by an equal-load scheme. A strategy of shared array allocation is applied for data management, that allows a large number of nested grids without creating additional memory allocations. Four model tests are conducted to verify the nesting algorithm, model accuracy, wetting-drying treatment, and the robustness in the application to modeling transoceanic tsunamis and coastal effects.

Young-Kwang Choi et al.

Status: open (until 30 May 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-35', Anonymous Referee #1, 10 Apr 2022 reply
    • AC1: 'Reply on RC1', Fengyan Shi Shi, 06 May 2022 reply
  • RC2: 'Comment on egusphere-2022-35', Anonymous Referee #2, 06 May 2022 reply

Young-Kwang Choi et al.

Young-Kwang Choi et al.


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Short summary
The multiple-grid nesting technique is an important methodology used for modeling transoceanic tsunamis and coastal effects. In this study, we developed a two-way nesting interface in a multigrid nesting system for the Boussinesq wave model, FUNWAVE-TVD. Some strategies in workload balance, data management, and parent-child communications in the MPI-based parallelization system are utilized to guarantee the model efficiency and accuracy. Four model tests are carried out in the paper.