The properties of turbulence generated by uniform fluxes of monodisperse spherical particles moving through a uniform flowing gas were studied experimentally, emphasizing the properties of the region surrounding individual wake disturbances, i.e., the turbulent inter-wake region. Mean and fluctuating values, probability density functions and energy spectra of streamwise and cross stream velocit...

We propose a fast and effective technique to improve sub-grid visual details of the grid based fluid simulation. Our method procedurally synthesizes the flow fields coming from the incompressible Navier-Stokes solver and the vorticity fields generated by vortex particle method for sub-grid turbulence. We are able to efficiently animate smoke which is highly turbulent and swirling with small sca...

For symbols see Fig. 2. Figure 2. The experimental second-order spatial longitudinal velocity correlation. Figure 3. The experimental second-order spatial longitudinal velocity correlation from the high Reynolds number grid generated isotropic turbulence (Stewart and Townsend 1951). Solid and dashed lines are the same as in Fig. 2.

This paper is concerned with the transition to turbulence in flat plate boundary layers due to moderately high levels of free-stream turbulence. The turbulence is assumed to be generated by an (idealized) grid and matched asymptotic expansions are used to analyse the resulting flow over a finite thickness flat plate located in the downstream region. The characteristic Reynolds number Rλ based o...

Abstract The unravelling of multilength-scale insert-generated turbulence, particularly, the induced-forcing plays critical role in fundamental comprehension energy formation and decay as a function grid conformation. This study experimentally investigates flow mechanical characteristics at Re Dh = 4.1 × 10 4 for regular-grid (RG), single-square-grid (SSG) six 2D planar space-filling square-fra...

The grid turbulence past a made of row prismatic circular rods (rod diameter = 10 mm, rod spacing 20 mm) perpendicular to the flow is observed by using pair PIV cameras. first one has field view larger (81 mm), second smaller (31 which increases dynamical range, where spectral properties can be explored. Energy spectra displays usual behavior approximately following k −5/3 law, anisotropy origi...

Abstract The spatial and temporal resolution of a fast-response aerodynamic pressure probe (FRAP) is investigated in benchmark flow grid-generated turbulence. A grid with mesh size $$M=6.4$$ M = 6.4 mm tested for two different free-stream velocities, he...

The paper is devoted to the experimental investigation of the statistical characteristics of the grid-generated turbulence produced in a wind tunnel. Ultrasonic time-of-flight method using dual transducers is utilized to develop a methodology for determination of the correlation functions of turbulent velocity and sound speed fluctuations. The ultrasonic flowmeter equation is considered in the ...