Speaker:

Prof. Van Thinh Nguyen, Department of Civil and Environmental Engineering, Seoul National University, South Korea

Abstract:

Stratified flows over topographies present challenging geophysical fluid dynamic problems with far reaching implications for circulation and mixing in oceans and the Great Lakes. The complexity of natural boundaries and topographies means that a three-dimensional model is often necessary. In addition, the hydrostatic approximation breaks down for small-scale processes such as the steepening, formation and breaking of non linear internal and nonhydrostatic waves; therefore, a non-hydrostatic three-dimensional model is required to study such phenomena. Finally, in order to simulate small-scale processes, high resolutions are necessary; and as a result, this requires use of High Performance Computers (HPC).

Nonlinear internal waves play an important role in redistribution of nutrients, pollutants and sediments in oceans and lakes. In this study, large scale simulations of nonlinear internal waves generated by tidal and wind forcing over three-dimensional topographies in the St. Lawrence Estuary and Lake Erie are described. The simulations are based on the MIT general circulation model (MITgcm) developed by Marshall et al., (1997) with some modifications for quasi-two layer fluid and open boundary conditions. The code is designed using a multi-level parallel decomposition to facilitate efficient execution on all foreseeable parallel computer architectures and processor types (Wrappable Application Parallel Programming Environment Resources Infrastructure). The code has been scaled on different parallel platforms (shared and distributed memories) provided by SHARCNET (Ontario) and RQCHP (Quebec).

The numerical results are compared with data from direct observations in the St. Lawrence Estuary and Lake Erie. In addition, a comparison of performances between different platforms will be presented.

Date:

Thursday, 30 June 2016, 14:00

Venue:

Jülich Supercomputing Centre, Besprechungsraum 1, building 16.3, room 350

Announcement as pdf file: