Here we show that the representative mechanism responsible for the origin of turbulence in wallbounded flows is associated with large variations of anisotropy in the disturbances [5]. During the breakdown process, anisotropy decays from a maximum towards its minimum value, inducing the explosive ...
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Despite the critics of many researchers, the use of wall functions to by-pass the difficulties involved with the modeling of low Reynolds number turbulence is still an attractive means to solve problems in a simple way. For instance, Cruz and Silva Freire [13], [14] have proposed an alterna...
Origin of Lagrangian Intermittency in Drift-Wave Turbulence The Lagrangian velocity statistics of dissipative drift-wave turbulence are investigated. For large values of the adiabaticity (or small collisionality), t... B Kadoch,WJT Bos,S Kai - 《Physical Review Letters》 被引量: 9发表: 2010年...
The pressure signal of oil pulsating flow is a kind of multi-component signal; in order to realise the effective separation of the multi-component pressure signal and extract its vibration characteristics, the pressure signal was decomposed by Variationa
due to these variations of the physical properties, wall functions are not valid, such that near-wall turbulence models are selected. In order to compare the merits of different approaches, the widely usedk−ω−SSTmodel (Menter, 1994) is compared to an eddy-viscosity model of the elliptic...
Turbulent Prandtl number distributions are measured in a laboratory boundary layer flow with bed roughness, active blowing and sucking, and scalar injection near the bed. The distributions are significantly larger than unity, even at large distances from the wall, in apparent conflict with the Reynold...
The front separates warm and salty Atlantic-origin waters from cold and fresh Arctic-origin waters. Energetic turbulence in the upper 30 m was consistent with convection by heat loss to the atmosphere and mechanical forcing by moderate winds at the surface of the ocean. At the front, the ...
The origin of the coordinate system, which is used throughout the paper, is located at the trailing edge of the central cooling hole with the axes oriented as indicated in Fig. 2. During the thermographic PIV measurements, the main flow as well as the cooling air were independently seeded ...
The total stress is replaced by the effective stress in the porous medium; thus, the initiation condition for vertical fracture is as follows:(7)σθ−pp|r=Rw=−σThwhere σTh is the rock horizontal tensile strength, MPa, and pp|r=Rw is the pore pressure at the borehole wall, MPa...