Large eddy simulation of turbulent flow around a windbreak

There are few practical applications for flow prediction in and around porous objects such as radiators, filters, fences or plant canopies. Reproduction of the configuration of solid obstacles in the fine mesh discretization is a direct way to make numerical calculations on porous objects. However, calculations using the fine mesh increase the computational load and cost a lot of time and money. In order to reduce these factors, we applied space averaging to the Navier–Stokes equations and derived filtered equations with a subgrid scale turbulent modeling for the large eddy simulation (LES). This paper demonstrates how we were able to calculate the space-averaged property of flows with coarse meshes without a heavy computational load. Finally, we also present a numerical calculation for the turbulent field around a windbreak placed on a flat plane and compare the results to a wind tunnel test data.