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Comparative analysis on turbulent regime: A self-affinity study in fluid flow by using OpenFoam CFD

Author

Listed:
  • Nascimento Filho, A.S.
  • de Souza, J.W.G.
  • Pereira, A.R.B.
  • Santos, A.A.B.
  • da Cunha Lima, I.C.
  • da Cunha Lima, A.T.
  • Moret, M.A.

Abstract

We investigate the self-affinity of a fluid velocity time series in turbulent regime. We use the CFD OpenFoam library to simulate the flow of fluid in a duct with two obstacles injecting vorticity downstream. We calculated the fluid velocity in three sections in of the structure. The simulation presented more turbulences in sections further away from obstacles. We assess the self-affinity of properties of those sections by using the Detrended Fluctuation Analysis method. This scaling method presented two behaviors. First, a persistent behavior after passing through obstacles. Second, a sub-diffusive behavior in turbulent sections, presenting a long-range correlation α exponent ranging between 1.0 and 1.5. The findings suggest that chaotic states tend to follow a sub-diffusive process.

Suggested Citation

  • Nascimento Filho, A.S. & de Souza, J.W.G. & Pereira, A.R.B. & Santos, A.A.B. & da Cunha Lima, I.C. & da Cunha Lima, A.T. & Moret, M.A., 2017. "Comparative analysis on turbulent regime: A self-affinity study in fluid flow by using OpenFoam CFD," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 474(C), pages 260-266.
    • Handle: RePEc:eee:phsmap:v:474:y:2017:i:c:p:260-266
    DOI: 10.1016/j.physa.2017.01.074
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    Cited by:

    1. Filho, A.S. Nascimento & Araújo, M.L.V. & Miranda, J.G.V. & Murari, T.B. & Saba, H. & Moret, M.A., 2018. "Self-affinity and self-organized criticality applied to the relationship between the economic arrangements and the dengue fever spread in Bahia," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 502(C), pages 619-628.
    2. Thiago B. Murari & Aloisio S. Nascimento Filho & Marcelo A. Moret & Sergio Pitombo & Alex A. B. Santos, 2020. "Self-Affine Analysis of ENSO in Solar Radiation," Energies, MDPI, vol. 13(18), pages 1-17, September.
    3. Santos, José Vicente Cardoso & Perini, Noéle Bissoli & Moret, Marcelo Albano & Nascimento, Erick Giovani Sperandio & Moreira, Davidson Martins, 2021. "Scaling behavior of wind speed in the coast of Brazil and the South Atlantic Ocean: The crossover phenomenon," Energy, Elsevier, vol. 217(C).

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