Microscopic analysis of turbulence topology in a regular porous medium is presented with a series of direct numerical simulation. The regular porous media are comprised of square cylinders in a staggered array. Triply periodic boundary conditions enable efficient investigations in a representative elementary volume. Three flow patterns—channel with sudden contraction, impinging surface, and wake—are observed and studied quantitatively in contrast to the qualitative experimental studies reported in the literature. Among these, shear layers in the channel show the highest turbulence intensity due to a favorable pressure gradient and shed due to an adverse pressure gradient downstream. The turbulent energy budget indicates a strong production rate after the flow contraction and a strong dissipation on both shear and impinging walls. Energy spectra and pre-multiplied spectra detect large scale energetic structures in the shear layer and a breakup of scales in the impinging layer. However, these large scale structures break into less energetic small structures at high Reynolds number conditions. This suggests an absence of coherent structures in densely packed porous media at high Reynolds numbers. Anisotropy analysis with a barycentric map shows that the turbulence in porous media is highly isotropic in the macro-scale, which is not the case in the micro-scale. In the end, proper orthogonal decomposition is employed to distinguish the energy-conserving structures. The results support the pore scale prevalence hypothesis. However, energetic coherent structures are observed in the case with sparsely packed porous media.
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June 2018
Research Article|
June 05 2018
Flow turbulence topology in regular porous media: From macroscopic to microscopic scale with direct numerical simulation
Xu Chu
;
Xu Chu
a)
Institute of Aerospace Thermodynamics, University of Stuttgart
, Pfaffenwaldring 31, 70569 Stuttgart, Germany
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Bernhard Weigand;
Bernhard Weigand
Institute of Aerospace Thermodynamics, University of Stuttgart
, Pfaffenwaldring 31, 70569 Stuttgart, Germany
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Visakh Vaikuntanathan
Visakh Vaikuntanathan
Institute of Aerospace Thermodynamics, University of Stuttgart
, Pfaffenwaldring 31, 70569 Stuttgart, Germany
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Xu Chu
a)
Bernhard Weigand
Visakh Vaikuntanathan
Institute of Aerospace Thermodynamics, University of Stuttgart
, Pfaffenwaldring 31, 70569 Stuttgart, Germany
a)
Electronic mail: [email protected]
Physics of Fluids 30, 065102 (2018)
Article history
Received:
March 23 2018
Accepted:
May 07 2018
Citation
Xu Chu, Bernhard Weigand, Visakh Vaikuntanathan; Flow turbulence topology in regular porous media: From macroscopic to microscopic scale with direct numerical simulation. Physics of Fluids 1 June 2018; 30 (6): 065102. https://doi.org/10.1063/1.5030651
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