presentation tdg #2
Post on 01-Nov-2014
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The JHU Turbulence Database Cluster
Visualization with Matlab
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Overview
• Recap of already presented stuff• New premade scripts• A few demos
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Recap #1
• Easy to use scripts: input boxes• Caching requests locally• Modified SOAP functions to speed up
request construction and parsing
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Recap #2
• 2D vector maps • 3D iso vorticity
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New vorticity scalar fields
• Q-criterion (second invariant of velocity gradient tensor)
• Lambda-2 criterion (negative second Eigenvalue of S2+Ω2)
• Complex Eigenvalues of velocity gradient
• Pressure hessian trace
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Energy spectra
• Randomly chosen lines• Fast Fourier Transform of inline
velocity component• Computation of scaled energy
spectra• Comparison with inertial sub range
line
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PDFs
• Randomly positioned cube of points: 323 points evenly distributed on 2563
• PDF of velocity components and pressure in this block with Matlab hist() function
• Log(PDF) of velocity gradient components (transverse and longitudinal)
• Nondimensionalized x-axis• Adapted bin width in logarithmic PDF
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PDFs of velocity increments
• Velocity increment:• Longitudinal: , transverse:
• Distribution of r:
• Randomly positioned and oriented block of 32x128x512 points, queried by 323 points
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