On numerical modeling of aerodynamics of urban developments on unstructured computational grids
S.A. Valger
Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia
Keywords: unstructured grids, polyhedral meshes, aerodynamics of urban developments, separation flows, software systems, ANSYS Fluent
Abstract
The issue of applicability of unstructured computational grids in the problems of numerical modeling of the aerodynamics of buildings is considered. The analysis of the computational performance and discretization errors on unstructured grids with polyhedral and tetrahedral forms of the grid element is performed on the test problem of the flow around square-section prism. The results of numerical modeling obtained on various types of grids are compared with experimental data on velocity profiles and turbulent kinetic energy in characteristic vertical and horizontal sections in the vicinity of the prism, as well as on the characteristic sizes of separation zones on the prism cover and behind it. When using a polyhedral computational grid, the calculation time is shown to be significantly less, compared to calculations on grids based on tetrahedra, while the calculation results qualitatively and quantitatively reproducing the experimental data. Non-stationary modeling on a polyhedral computational grid is carried out in this work using a vortex-resolving turbulence model. Calculations using the vortex-resolving approach allow refining the parameters of the recirculation zone behind the prism. The calculations are performed in the Fluent 2020R1 solver.
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