Publications related to Propagation of a height contained hydraulic fracture in turbulent flow regimes

Propulsion and Instability of a Flexible Helical Rod Rotating in a Viscous Fluid

Pedro Miguel Nunes Pereira de Almeida Reis

We combine experiments with simulations to investigate the fluid-structure interaction of a flexible helical rod rotating in a viscous fluid, under low Reynolds number conditions. Our analysis takes into account the coupling between the geometrically nonli ...

American Physical Society2015

Flow separation at convex banks in open channels

Koen Blanckaert

Laboratory experiments in an open channel bend provide insight into the physics of convex bank flow separation occurring in a variety of channel configurations, including confluences and bifurcations. The edge of the zone of flow separation is characterize ...

Cambridge Univ Press2015

ISTTOK Scrape-off Layer Turbulent Regimes

Paolo Ricci, Federico David Halpern, Rogério Manuel Cabete De Jesus Jorge

Use of the GBS code to successfully identify the turbulent regimes of ISTTOK's Scrape-off Layer. This was done through linear calculations and two and three dimensional nonlinear simulations. The numerical and experimental results were compared showing goo ...

2015

An indirect criterion for the laminar to turbulent flow transition in shear-driven annular liquid films

John Richard Thome, Andrea Cioncolini

An indirect method to identify the laminar to turbulent flow transition in shear-driven annular liquid films has been developed and used, together with literature measurements of the velocity profile, to approximately resolve the near wall structure in she ...

Pergamon-Elsevier Science Ltd2015

Heat Transfer Augmentation in a Straight Channel via Two Oscillating Circular Cylinders

David Andrew Barry, Mohsen Cheraghi

We consider flow-through systems in which the characteristic length is limited such that turbulent flow is not reached even at high fluid velocities, i.e., the flow remains laminar. Inthese flow regimes, inducing circulation or vortices in the flow enhance ...

2014

Advancing plasma turbulence understanding through a rigorous Verification and Validation procedure: a practical example

Paolo Ricci

The methodology used to assess the reliability of numerical simulation codes constitutes the Veri- fication and Validation (V&V) procedure. V&V is composed by two separated tasks: the verifica- tion process, which is a mathematical issue targeted to assess ...

2014

Boundary layer effects on the vortex shedding in a Donaldson-type hydrofoil

François Avellan, Mohamed Farhat, Amirreza Zobeiri, Eduard Egusquiza

Structure Interaction (FSI) phenomena is becoming a relevant study field for the design or revamping of hydropower plants. The generalized trend of increasing flow rates and reducing rotor blades/stay vanes thickness in order to improve the efficiency of t ...

International Association For Hydraulic Research2014

Forced reattachment in separated flows: a variational approach to recirculation length reduction

François Gallaire, Edouard Boujo

Sensitivity analysis is used to design an open-loop control for separated flows. The length of the recirculation region

l_c

is expressed as a cost functional, and its sensitivity to actuation is derived analytically. This analysis allows to identify regi ...

2013

Turbulent regimes in the tokamak scrape-off layer

Paolo Ricci, Joaquim Loizu Cisquella, Sébastien Jolliet, Federico David Halpern, Annamaria Mosetto

The non-linear turbulent regimes in the tokamak scrape-off layer (SOL) are identified according to the linear instability responsible for the perpendicular transport. Four regions of the SOL operational parameters are determined where turbulence is driven ...

American Institute of Physics2013

Investigation of droplet shedding in flow focusing geometries using the boundary element method.

François Gallaire, Mathias Nagel

Shedding of droplets in a flow focusing junction is standard technique in two-phase microfluidics. This break-up is driven by a capillary instability. Here we present a depth-averaged approach to simulate these complex phenomena. Since the physical mechani ...

2013

Propagation of a height contained hydraulic fracture in turbulent flow regimes

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Propulsion and Instability of a Flexible Helical Rod Rotating in a Viscous Fluid

Flow separation at convex banks in open channels

ISTTOK Scrape-off Layer Turbulent Regimes

An indirect criterion for the laminar to turbulent flow transition in shear-driven annular liquid films

Heat Transfer Augmentation in a Straight Channel via Two Oscillating Circular Cylinders

Advancing plasma turbulence understanding through a rigorous Verification and Validation procedure: a practical example

Boundary layer effects on the vortex shedding in a Donaldson-type hydrofoil

Forced reattachment in separated flows: a variational approach to recirculation length reduction

Turbulent regimes in the tokamak scrape-off layer

Investigation of droplet shedding in flow focusing geometries using the boundary element method.

ISTTOK Scrape-off Layer Turbulent Regimes

Heat Transfer Augmentation in a Straight Channel via Two Oscillating Circular Cylinders

Propulsion and Instability of a Flexible Helical Rod Rotating in a Viscous Fluid

Flow separation at convex banks in open channels

An indirect criterion for the laminar to turbulent flow transition in shear-driven annular liquid films

Advancing plasma turbulence understanding through a rigorous Verification and Validation procedure: a practical example

Boundary layer effects on the vortex shedding in a Donaldson-type hydrofoil

Forced reattachment in separated flows: a variational approach to recirculation length reduction

Turbulent regimes in the tokamak scrape-off layer

Investigation of droplet shedding in flow focusing geometries using the boundary element method.