POD based inflow turbulence generation method for large eddy simulation

A general inflow turbulence synthetic method for large eddy simulation (LES) involved in parallel calculation was proposed. The fluctuating velocities at some main grid points on inflow boundary were generated adopting POD based spectral representation method. The timeseries of velocities at all grid points on the inflow panel were spatially interpolated, adopting the finite element shape functions. The synthesized velocities were then read in commercial code Fluent by using user-defined-functions (UDF) program with special consideration of parallel calculation. In order to verify the efficiency of the presented method, the flow around a single square section tall building with width to height aspect ratio of 1:6 was numerically simulated by adopting the presented inflow turbulence generation method for LES. The simulated wind profiles, wind spectra, statistics, self-spectra, and coherence of wind pressure coefficients, were compared with the experimental results as well as with the numerical results of existing works in detail. The presented inflow turbulence generation method for LES was verified as having been successfully applicable to a certain extent in simulating turbulent wind field and predicting wind loads on buildings.