Developing accurate wall functions for LES is a great challenge. This is indeed also the case also for RANS. It can be argued that it should be easier to develop accurate wall functions for LES than for RANS. In a well-resolved LES using wall functions, the task of the wall function is to give an instantaneous wall shear stress; this does probably not need to be exactly correct. Compare with in...

Wall-flow filters are a standard component in exhaust gas aftertreatment and have become indispensable vehicles. Ash soot particles generated during engine combustion deposited diesel or gasoline particulate filters. During regeneration, the oxidized. The remaining ash can form different deposition patterns: homogenous layer plug-end filling. It has not yet been clarified whether filling is fir...

The elution of particles from a coupled acoustic-gravity channel has been controlled by a phase-shift operation. Two ultrasound transducers pasted onto the top and bottom walls of a separation channel were driven at the same frequency, but with different phases. Changing the phases of the ultrasounds has allowed the formation of a node near the channel wall, and particles are retained in the ch...

The pulsating flow of MHD Casson nanofluid through a channel with the influence thermal radiation is studied, considering in vertically upward direction, maintaining same velocity at lower wall and upper wall. perturbation technique was employed to solve dimensionless expressions temperature. effect various parameters such as Prandtl number fluid parameter on variables has been discussed.

Large eddy simulation is used to simulate flame acceleration and deflagration detonation transition of methane-air mixtures in a small-scale 3D channel. The results show the changing surface structure stage transition. In first stage, velocity increases exponentially because expansion combustion products wrinkle surface. next interaction between pressure wave makes accelerate continuously, rate...

Effects of material and configuration of the internal wall on the performance of wideband channel are investigated by using the Finite Difference Time-Domain (FDTD) method. The indoor wideband channel characteristics, such as the path-loss, Root-Mean-Square (RMS) delay spread and number of the multipath components (MPCs), are presented. The simulated results demonstrate that the path-loss and M...

A new adaptive controller based on a neural network was constructed and applied to turbulent channel ow for drag reduction. A simple control network, which employs blowing and suction at the wall based only on quantities measured at the wall, was shown to reduce the skin friction by as much as 20% in direct numerical simulations of low-Reynolds number turbulent channel ow. Also, a pattern was o...

A tissue-engineering scaffold resembling the structure of the natural extracellular matrix can often facilitate tissue regeneration. Nerve and tendon are oriented micro-scale tissue bundles. In this study, a method combining injection molding and thermally induced phase separation techniques is developed to create single- and multiple-channeled nanofibrous poly(L-lactic acid) scaffolds. The ove...

This paper presents a numerical study of the thermal performance of fins mounted on the bottom wall of a horizontal channel and cooled with either pure water or an Al2O3-water nanofluid. The bottom wall of the channel is heated at a constant temperature and cooled by mixed convection of laminar flow at a relatively low temperature. The results of the numerical simulation indicate that the heat ...

It has been possible to modify the sampler module of the AutoAnalyzer to enable laboratoriespossessingadditional recorder and colorimeter units to analyse two sets of specimens simultaneously. Basically the device consists of a circular plastic channel of rectangular cross-section which fits on top of the normal sample plate and carries a second ring of cups (Fig. 1). The external diameter is 1...