In the present study an active flow control actuator is studied numerically using the CFD package Fluent R ©. A two-dimensional setup is chosen which corresponds to a cut through the actual configuration that was studied experimentally by Lachowicz et al. [1] and called “Jet and Vortex Actuator” (JaVA) because of its ability to produce such completely different flow regimes when its actuation f...

Plasma jets produced by direct-current (dc) non-transferred arc plasma torches, at the core of technologies ranging from spray coating to pyrolysis, present intricate dynamics due to the coupled interaction of fluid flow, thermal and electromagnetic phenomena. The flow dynamics from an arc discharge plasma jet are investigated using time-dependent three-dimensional simulations encompassing the ...

In this paper, A numerical study has been conducted to predict the hydrodynamic characteristics of the staggered ribbed backward facing step flow with inclined impinging jet. The impinging jet flow was inclined towards the main cross flow and the angle of inclination is ranged from  30 to  90 . The ribs were in staggered arrangement and aligned after the slot jet in normal direction to the ma...

Recent work on studying rarefied background and jet flow interactions is reported. A new gaskinetic method is developed to investigate two closely related problems. The first problem is how a collisionless background flow can affect a highly rarefied jet flow. The rarefied jet and background flow conditions are assumed available and described with seven parameters. Gaskinetic theories are appli...

Two high-speed stereo PIV (HS-SPIV) systems have been used for the characterization of pulsed and continuous jet actuators in the turbulent boundary layer (TBL) wind tunnel at ONERA Lille, an Eiffel type wind tunnel in suction mode with a low turbulence level. The test aimed at generating an aerodynamic database useful for the characterisation of (unsteady) vortical structures responsible for t...

This work investigates the ability of Coanda jet blowing to modify the base pressure of a cylindrical body aligned axially in a flow, and thereby, produce overall drag reduction. It is found that blowing through one or two slot jets concentric to the outer body circumference can significantly influence the entire base flow region. The recirculating wake is eliminated and is replaced by freestre...

We study numerically the dynamics of jets and drops in a microcapillary coflow device. The co-flow stream encounters different flow regimes, including dripping, jetting. Using a level-set/finite element axysimmetric numerical simulation, we study the dynamics of breakup of a jet subject to flow rate perturbations. A scaling law for the width of the unperturbed jet is presented and compared to e...

OBJECTIVE To evaluate the ability of colour Doppler transoesophageal echocardiography (TOE) to assess quantitatively prosthetic mitral valve insufficiency. METHODS 47 patients were studied with multiplane TOE and cardiac catheterisation. Proximal jet diameter was measured as the largest diameter of the vena contracta. Regurgitant area was measured by planimetry of the largest turbulent jet du...