Laurent Perret

Turbulent inflow conditions for large-eddy simulation based on low-order empirical model

Generation of turbulent inflow boundary conditions is performed by interfacing an experimental database acquired by particle image velocimetry to a computational code. The proposed method ensures that the velocity fields introduced as inlet conditions in the computational code present correct one- and two-point spatial statistics and a realistic temporal dynamics. This approach is based on the use of the proper orthogonal decomposition (POD) to interpolate and extrapolate the experimental data onto the numerical mesh and to model both the temporal dynamics and the spatial organization of the flow in the inlet section. Realistic representation of the flow is achieved by extracting and modeling independently its coherent and incoherent parts. A low-order dynamical model is derived from the experimental database in order to provide the temporal evolution of the most energetic structures. The incoherent motion is modeled by employing time series of Gaussian random numbers to mimic the temporal evolution of hi...

Effect of upstream flow regime on street canyon flow mean turbulence statistics

The effect on the flow over a street canyon (lateral length/height, L/h

Friction Measurement in Zero and Adverse Pressure Gradient Boundary Layer Using Oil Droplet Interferometric Method

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Relating street canyon vertical mass-exchange to upstream flow regime and canyon geometry

= 30) of using either 3D (cube) or 2D (rectangular block) upstream roughness arrays, of the same height as the canyon, has been studied for two streamwise canyon width to height aspect ratios (AR

INVESTIGATION OF THE LARGE SCALE STRUCTURES IN THE TURBULENT MIXING LAYER DOWNSTREAM A THICK PLATE

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DYNAMICS OF A TURBULENT BOUNDARY LAYER OVER CUBICAL ROUGHNESS ELEMENTS: INSIGHT FROM PIV MEASUREMENTS AND POD ANALYSIS

= W/h) of 1 and 3, in a wind tunnel using Particle Image Velocimetry. The mean streamwise velocity, shear stress, turbulent intensities and length scales, together with shear layer boundaries and mass fluxes across the canyon opening are presented for different combinations of skimming and wake-interference regimes using different upstream roughness and canyon configurations. These results show significant trends with canyon aspect ratio and roughness array plan area packing density