EXPERIMENTAL INVESTIGATION OF BOUNDARY LAYER TURBULENCE IN A WATER FLUME Daniel E. Dombroski PI: John P. Crimaldi Environmental Fluid Mechanics Laboratory,

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Presentation transcript:

EXPERIMENTAL INVESTIGATION OF BOUNDARY LAYER TURBULENCE IN A WATER FLUME Daniel E. Dombroski PI: John P. Crimaldi Environmental Fluid Mechanics Laboratory, University of Colorado at Boulder

Some Background pollutants odor signals reproduction Environmental Fluid Mechanics: - Implications of Turbulence on Natural Systems - Duality of Hydrodynamics and Chemical Signaling - Methodology & Devolopment of Techniques

Projects Accuracy of Acoustic Doppler Velocimetry (ADV) Measurements in Turbulent Boundary Layer Flows* *Dombroski and Crimaldi, Limnology & Oceanography: Methods, 2007 Biofouling Phenomena: Growth of communities of organisms on submerged surfaces 3D Visualization of Plume Dynamics

Accuracy of Acoustic Doppler Velocimetry Acoustic Doppler Velocimeter - Commonly Used Field Instrument - ‘Economical’ ~ $10k - Relatively Low Spatio-Temp Resolution Laser Doppler Velocimeter - Precision Laboratory Instrument - ‘Pricey’ ~ $250k + - High Spatio-Temp Resolution

ADV Significantly Underreports Turbulence Statistics Spalart DNS (1988)

Biofouling

Early Stage Fouling Plate Late Stage Fouling Plate

Algorithm Statistical analysis of stress lulls in instantaneous record Steps: (1)Calculate stress record,  =  u’w’ (2)Divide record into stress ‘lulls’, L i (3)Calculate anchoring probability, P a : Figure adapted from Crimaldi et al, 2002 Dependent on criteria T crit & t a where For discrete time intervals Δ t, evaluate ψ i as: Where j a = # of time steps in t a where N i = # of samples in i th stress lull Nmax = # of samples in longest stress lull Combining,

 50 Stress Calculation Ship WakeWind Chop

Flow Visualization 3D Planar Laser Induced Fluorescence Scalar: Rhodamine 6G Passive - Moves with and diffuses relative to the flow without effecting the governing physics Conservative - Nonreactive Plume: Bed-level, low momentum release –Think odor release at river bed

3D PLIF Schematic

Flow Dynamics

Coherence

Relevant Scales Experimental Resolution Image Plane (based on CCD chip) ~ 0.1 mm Transverse (based on laser beam) ~ 0.25 mm Kolmogorov - smallest eddies ~ 1 mm (Estimated from dissipative & viscous scaling) Batchelor - smallest chemical gradients ~ 0.01 mm (Estimated from Kolmogorov scale, Schmidt number)

time “Burst – Sweep” Action

Moving away from the plume centerline…

Scalar Gradients (ie, where’s the mixing?) dC/dx dC/dy dC/dz

Correcting Artifacts Spatial Undersampling