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Unsteady turbulent flows

A Kalman filter adapted to the estimation of mean gradients in the large-eddy simulation of unsteady turbulent flows

A Kalman filter adapted to the estimation of mean gradients in the large-eddy simulation of unsteady turbulent flows

... Fig. 12. Instantaneous isocontours of the Strouhal number based on the cut-off frequency of the Kalman filter: St K ( x, t ) = f Kalman ( x, t ) · D/U ∞ on a plane normal to the cylinder axis, at the same position and ...

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Detached eddy simulation of unsteady turbulent flows in the draft tube of a bulb turbine

Detached eddy simulation of unsteady turbulent flows in the draft tube of a bulb turbine

... the turbulent velocity signal based on a target turbulent energy ...a turbulent velocity signal with prescribed statistics like length scale [Klein et ...planar turbulent jets [Klein et ...

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Algebraic-Closure-Based Moment Method for Unsteady Eulerian Simulations of Non-Isothermal Particle-Laden Turbulent Flows at Moderate Stokes Numbers in Dilute Regime

Algebraic-Closure-Based Moment Method for Unsteady Eulerian Simulations of Non-Isothermal Particle-Laden Turbulent Flows at Moderate Stokes Numbers in Dilute Regime

... Keywords Unsteady Eulerian two-fluid model · Particle-laden flows · DNS 1 Introduction Due to the vast importance that particle-laden turbulent flows have nowadays in many industrial ...

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Algebraic-Closure-Based Moment Method for Unsteady Eulerian Simulations of Non-Isothermal Particle-Laden Turbulent Flows at Moderate Stokes Numbers in Dilute Regime

Algebraic-Closure-Based Moment Method for Unsteady Eulerian Simulations of Non-Isothermal Particle-Laden Turbulent Flows at Moderate Stokes Numbers in Dilute Regime

... Keywords Unsteady Eulerian two-fluid model · Particle-laden flows · DNS 1 Introduction Due to the vast importance that particle-laden turbulent flows have nowadays in many industrial ...

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Unsteady flows measurements using a calorimetric wall shear stress micro-sensor

Unsteady flows measurements using a calorimetric wall shear stress micro-sensor

... a turbulent boundary layer wind ...a turbulent boundary layer wind tunnel demon- strated the HTGC micro-sensor performances, competing with conventional commercially available ...the unsteady ...

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Prediction of the unsteady turbulent flow in an axial compressor stage. Part 2: Analysis of unsteady RANS and LES data

Prediction of the unsteady turbulent flow in an axial compressor stage. Part 2: Analysis of unsteady RANS and LES data

... This paper presents the analysis of URANS and LES database in a stage of an axial subsonic compressor. Details about numerical methods and comparison with experiments can be found in a companion paper. The analysis here ...

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Prediction of the unsteady turbulent flow in an axial compressor stage. Part 1: Comparison of unsteady RANS and LES with experiments

Prediction of the unsteady turbulent flow in an axial compressor stage. Part 1: Comparison of unsteady RANS and LES with experiments

... all turbulent scales, is the most common and mature method. The unsteady RANS (URANS) approach is a natural extension of the RANS formalism to address unsteady flows, including non- periodic ...

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A Sensitivity Equation Method for Unsteady Compressible Flows: Implementation and Verification

A Sensitivity Equation Method for Unsteady Compressible Flows: Implementation and Verification

... 6.3 Boundary layer flow with periodic actuation We consider now an unsteady viscous flow including a periodic suction / blowing device, in the spirit of synthetic jet actuators. This device, of length h/10, is ...

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Shape Optimisation in Unsteady Flows

Shape Optimisation in Unsteady Flows

... Unit´e de recherche INRIA Lorraine, Technopˆole de Nancy-Brabois, Campus scientifique, ` NANCY 615 rue du Jardin Botanique, BP 101, 54600 VILLERS LES Unit´e de recherche INRIA Rennes, Ir[r] ...

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Stochastic dynamics of particles trapped in turbulent flows

Stochastic dynamics of particles trapped in turbulent flows

... approach. Turbulent flows laden with particles give the opportunity to study a trapping problem with correlated ...real turbulent flows have a mean structure, with shear layers separating ...

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An algebraic-closure-based momentmethod for unsteady Eulerian modeling of non-isothermal particle-laden turbulent flows in very dilute regime and high Stokes number

An algebraic-closure-based momentmethod for unsteady Eulerian modeling of non-isothermal particle-laden turbulent flows in very dilute regime and high Stokes number

... 2. Unsteady Eulerian Modeling The algebraic-closure-based moment method (ACBMM) is based on a conditional statistical approach [1] which provides a local instantaneous characterization of the dynamic of the dis- ...

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An algebraic-closure-based momentmethod for unsteady Eulerian modeling of non-isothermal particle-laden turbulent flows in very dilute regime and high Stokes number

An algebraic-closure-based momentmethod for unsteady Eulerian modeling of non-isothermal particle-laden turbulent flows in very dilute regime and high Stokes number

... 2. Unsteady Eulerian Modeling The algebraic-closure-based moment method (ACBMM) is based on a conditional statistical approach [1] which provides a local instantaneous characterization of the dynamic of the dis- ...

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Development of tomographic PIV for the study of turbulent flows

Development of tomographic PIV for the study of turbulent flows

... and unsteady flow structures around two-dimensional models such as cylinders, prisms, or ...in turbulent flows, using dye or smoke as flow markers (figure ...in turbulent flows where ...

178

Are extreme dissipation events predictable in turbulent fluid flows?

Are extreme dissipation events predictable in turbulent fluid flows?

... FIG. 7. Contours and isosurfaces of axial velocity u for several POD modes. Isosurfaces are defined at u = ±0.01. Mode indicies are defined as in Fig. 5 . subcritical transition to turbulence. Specifically, despite the ...

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Unsteady flows in milli-and microsystems : analysis of wall shear rate fluctuations

Unsteady flows in milli-and microsystems : analysis of wall shear rate fluctuations

... analyze unsteady flow properties in various configurations of miniaturized systems by relying upon electrodiffusion diagnostics in the near-wall vicinity; this method is currently employed to investigate ...

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2015 — Finite element model for three-dimensional compressible turbulent flows

2015 — Finite element model for three-dimensional compressible turbulent flows

... compressible flows without ...viscous flows with shocks on standard unstructured ...the unsteady compressible Navier-Stokes equations in conservation-variable ...compressible flows using a ...

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The first-digit frequencies in data of turbulent flows

The first-digit frequencies in data of turbulent flows

... Reynolds number is not large enough, the flow is not exactly isotropic or the self-similarity assumption is not valid. The last point is related to the intermittent feature of the cascade process, resulting in anomalous ...

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The childhood of turbulent spot in shear flows

The childhood of turbulent spot in shear flows

... the turbulent growing spot with a quadrupolar ...model flows [4, 17, 25] and in other shears flows as in plane Poiseuille ...large-scale flows have on the spot growth process along the ...

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Optimization of active control devices for separated turbulent flows

Optimization of active control devices for separated turbulent flows

... of turbulent flow control is the CPU time and possible local ...steady flows, but they become really cumbersome and difficult to apply in case of unsteady flows [ Belme 2011 ...

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A continuous shape sensitivity equation method for unsteady laminar flows

A continuous shape sensitivity equation method for unsteady laminar flows

... The paper is organized as follows. First, we present the equations describing time-dependent laminar flow along with their boundary and initial conditions. The shape sensitivity equations and their boundary/initial ...

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