We investigate the in-line and cross-flow vortex-induced vibrations of a long cylindrical tensioned beam, with length to diameter ratio L/D=200, placed within a linearly sheared oncoming flow, using three-dimensional direct numerical simulation. The study is conducted at three Reynolds numbers, from 110 to 1100 based on maximum velocity, so as to include the transition to turbulence in the wake...

Keywords: Articulated vehicles Bluff bodies Road vehicle aerodynamics Square back vehicles Wake flow Wind tunnel tests a b s t r a c t An experimental study has been conducted to investigate both the time-averaged and instantaneous flow pattern over a scale articulated vehicle model for understanding the flow physics of tractor-trailer vehicles. Fully turbulent flow was used in the study and sm...

The corner separation in the high-loaded compressors deteriorates the aerodynamics and reduces the stable operating range. The flow pattern is further complicated with the interaction between the aperiodic corner separation and the periodically wake-shedding vortices. Accurate prediction of the corner separation is a challenge for the Reynolds-Averaged Navier–Stokes (RANS) method, which is base...

An experimental investigation of the steady, laminar near-wake flow field of a two-dimensional, adiabatic, c i rcular cylindcr with surface m a s s t r a n s f e r h a s been made a t a f r e e s t r e a m Mach number of 6. 0. t ra t ion f ie lds associated with the t r ans fe r of argon, nitrogen o r helium into the near wake were studied for m a s s t r ans fe r f rom the forward stagnation r...

A model of the diffusion of ionosheath plasma into the wake region of Venus is presented. It is shown that particle diffusion, which is assumed to be a consequence of the fluctuating magnetic field observed in the wake of Venus by Pioneer Venus and Veneras 9 and 10, can explain the plasma observations made in the wake by Veneras 9 and 10. The pressure due to these diffusing particles when balan...

The effect of human motion on wake flow dynamics and particle dispersion were investigated by experimental visualisation and Computational Fluid Dynamics (CFD) modelling using a mannequin model with realistic human shape. A new smoke visualisation technique is proposed which made use of the chemical reaction between acetic acid and cyclohexylamine. The CFD model used a dynamic mesh to simulate ...

[1] Pyroclastic density currents (PDCs) are gas-particle flows generated during explosive eruptions, which are often erupted over the flanks of stratovolcanoes. These volcanoes may have different shapes, which can affect the flow aerodynamics and hence the depositional processes. Here, multiphase numerical simulations are carried out in order to define semiquantitative relationships among the P...

The Authors have found a clever solution to the discontinuity of the velocity gradient at the axis of uniform turbulent pipe flow in the log-wake model by means of a modification with a cubic correction function. Their modified log-wake law leads to a very good replication of the velocity profiles of a large series of smooth pipe flow experiments (see Fig. 5). Moreover, it leads to a correct ed...

In this paper, we have simulated the excitation of wake fields in the interaction of an intensive laser pulses having Half-Sine and Gaussian time envelopes with a fully ionized cold plasma using particle in cell (PIC) method. We investigated the dependency of wake filed amplitude to different laser and plasma parameters such as laser wavelength, pulse duration and electron number density. In ad...