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Session: Lagrangian aspects of turbulence 4

Session starts: Friday 28 August, 10:30

Presentation starts: 11:00

Room: Room F

*Hadi Rajaei (Eindhoven University of Technology)*

Rudie Kunnen (Eindhoven University of Technology)

Herman Clercx (Eindhoven University of Technology)

Abstract:

This study aims to explore how the flow transition from one state to the other in rotating convection will affect the Lagrangian statistics of (fluid) particles. 3D Particle Tracking Velocimetry (3D-PTV) is employed in a water-filled cylindrical tank of equal height and diameter 200 mm. The measurements are performed in the central volume of 50 × 50 × 50 mm3 at a Rayleigh number Ra = 1.28 × 109 and Prandtl number Pr = 6.7. We are reporting the velocity and acceleration pdfs for different Rossby numbers. For different rotation rates, the transverse velocity pdfs show a Gaussian distribution. The vertical velocity pdf has slightly wider tails for stationary and high rotation rate cases, while it approaches the Gaussian distribution for intermediate rotation rates. The acceleration pdfs have significantly wider tails in comparison to those of a Gaussian distribution which is similar to the other turbulent flows. Increasing rotation results in less intermittency in vertical acceleration in the center of RB.

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*Hadi Rajaei, Rudie Kunnen, Herman Clercx*

11:00

15 mins

LAGRANGIAN ANALYSIS OF TURBULENT ROTATING CONVECTION
15 mins

Session starts: Friday 28 August, 10:30

Presentation starts: 11:00

Room: Room F

Rudie Kunnen (Eindhoven University of Technology)

Herman Clercx (Eindhoven University of Technology)

Abstract:

This study aims to explore how the flow transition from one state to the other in rotating convection will affect the Lagrangian statistics of (fluid) particles. 3D Particle Tracking Velocimetry (3D-PTV) is employed in a water-filled cylindrical tank of equal height and diameter 200 mm. The measurements are performed in the central volume of 50 × 50 × 50 mm3 at a Rayleigh number Ra = 1.28 × 109 and Prandtl number Pr = 6.7. We are reporting the velocity and acceleration pdfs for different Rossby numbers. For different rotation rates, the transverse velocity pdfs show a Gaussian distribution. The vertical velocity pdf has slightly wider tails for stationary and high rotation rate cases, while it approaches the Gaussian distribution for intermediate rotation rates. The acceleration pdfs have significantly wider tails in comparison to those of a Gaussian distribution which is similar to the other turbulent flows. Increasing rotation results in less intermittency in vertical acceleration in the center of RB.