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Paper detail

A Comparison of Turbulence Generated by 3DS Sparse Grids With Different Blockage Ratios and Different Co-Frame Arrangements

A new type of grid turbulence generator, the 3D sparse grid (3DS), is a co-planar arrangement of co-frames each containing a different length scale of grid elements [Malik, N. A. US Patent No. US 9,599,269 B2 (2017)] and possessing a much bigger parameter space than the flat 2D fractal square grid (2DF). Using DNS we compare the characteristics of the turbulence (mean flow, turbulence intensity, energy spectrum) generated by different types of 3DS grids. The peak intensities generated by 3DS can exceed the peaks generated by the 2DF by 80\%; we observe that a 3DS with blockage ratio 24\% produces turbulence similar to the 2DF with blockage ratio 32\% implying lower energy input for the same turbulence.

preprint2020arXivOpen access
M. Syed UsamaNadeem A. Malik
physics.comp-phphysics.flu-dyn
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M. Syed UsamaNadeem A. Malik

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