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Visualization of Mechanical Processes: An International Online Journal


ISSN Online: 2152-209X

Visualization of Mechanical Processes: An International Online Journal

DOI: 10.1615/VisMechProc.2016016329

CFD-BASED VISULIZATION OF SINGLE-WAVE FLOW INTRACTING WITH A TRIANGULAR OBSTACLE

Evgueni M. Smirnov
Department of Hydro- and Aerodynamics at the Saint-Petersburg Polytechnic University, Polytechnicheskaya, 29, St. Petersburg, 195251, Russia
Alexander I. Khrabry
Department of Hydro- and Aerodynamics at the Saint-Petersburg Polytechnic University, Polytechnicheskaya, 29, St. Petersburg, 195251, Russia
Dmitri K. Zaitsev
Department of Hydro- and Aerodynamics at the Saint-Petersburg Polytechnic University, Polytechnicheskaya, 29, St. Petersburg, 195251, Russia

ABSTRACT

Dam-break turbulent flow interacting with a triangular obstacle is studied numerically. Two-dimensional (2D) and three-dimensional (3D) computations obtained by the volume-of-fluid method and based on previously published experiments have been carried out using an in-house unstructured-grid finite-volume Navier−Stokes code. Comprehensive visualization of the evolving flow structures in the near-obstacle region was performed. Videos and images illustrating 2D and 3D free-surface shapes as well as highly resolved velocity vector and wall friction patterns are presented. It has been established that the action of the bottom wall friction leads to the formation of one or two separation bubbles, depending on the flow development phase, and to the occurrence of associated hills at the free surface, which were observed in experimental photographs as well. The viscous effects at the confining-side walls of the channel result in a considerable 3D shape of the computed free surface, and its side view agrees with the experimental photographs much more than the result given by 2D solutions. Local-in-time separation of the flow from the side walls, predicted with the 3D formulation, is visualized as well.