The Minimal Flow Unit in Near-Wall Turbulence 来自 Semantic Scholar 喜欢 0 阅读量: 238 作者:J Jimeez,P Moin 摘要: Direct numerical simulations of unsteady channel flow were performed at low to moderate Reynolds numbers on computational boxes chosen small enough so that the flow consists of a ...
It was shown by Wells and Spangler (1967) that this phenomenon is associated with flow changes in the near-wall region. The electrochemical techniques have been proved to be suitable for the study of wall turbulence, Fortuna and Hanratty (1972) . In this work, the improved electrochemical ...
Co-Supporting Cycle: Sustaining Mechanism of Large-Scale Structures and Near-Wall Structures in Channel Flow Turbulence Direct numerical simulation of a turbulent channel flow in a periodic domain of relatively wide spanwise extent, but minimal streamwise length, is carried ... S Toh,T Itano,S Kai...
The Comparative measurements of turbulence structure near the wall in rectangular tube flow are carried out by electrochemical sensor and by laser velocimeterj The effect of ion migration on frequency response of electrode sensor is discussed. The results both from analysis and from experiment indicate...
Turbulence was modelled using the k-omega-SST model by Menter [30]. It is suitable for modelling the transition from the high velocities near the burner inlets to the extremely low velocities expected close to the heated walls of the combustion chamber. This approach was recommended for the sam...
They found that the distortion of the shear layer resulted in an increase in occurrence probabilities of ejection and sweep events within the shear layer, which were related to the turbulence presenting vortices induced by the wall. In order to compare the experimental tests found in the ...
It was revealed that the turbulence was close to an axisymmetric state in the stagnation region. The budget equation for the turbulent kinetic energy evaluated from the present data shows that the net negative production takes place in the vicinity of the wall. This negative production is ...
An evaluation of four well-known Reynolds-Averaged Navier–Stokes (RANS)-based turbulence models was performed in comparison with the results of a dedicated experimental measurement on the near-wake of a circular cylinder in a large water (cavitation) tunnel using a state-of-the-art two-dimension...
with minimal energy required. On the other hand, micro/nano spin electronic devices constructed using electron spin degrees of freedom can exhibit the physical properties of tiny magnets and can be used to simulate synaptic behavior in biological nerves65. At present, people have proposed several re...
The characteristics of the structure of the streamwise vortice in the near-wall region are investigated. The streamwise vortices make a pair in the buffer layer and log-region. The pair of the vortices counterrotates each other and lift up more low speed fluid near the wall in between the vo...