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Dynamics of the nonequilibrium flow in a duct with obstruction

Author

Listed:
  • G. da Silva Costa

    (Instituto Federal de Educação, Ciência e Tecnologia da Bahia, Camaçari, BA, Brazil†Programa de Modelagem Computacional - SENAI - Cimatec, Salvador, Bahia, Brazil)

  • F. Rodrigues Santos

    (Instituto Federal de Educação, Ciência e Tecnologia da Bahia, Camaçari, BA, Brazil†Programa de Modelagem Computacional - SENAI - Cimatec, Salvador, Bahia, Brazil)

  • D. Lira

    (#x2020;Programa de Modelagem Computacional - SENAI - Cimatec, Salvador, Bahia, Brazil)

  • I. C. da Cunha Lima

    (#x2020;Programa de Modelagem Computacional - SENAI - Cimatec, Salvador, Bahia, Brazil‡Pursuelife - Consultancy on Applied Science, Salvador, Bahia, Brazil§INCT-GP, Petroleum Geophysiscs, Bahia - Brazil)

  • A. T. da Cunha Lima

    (#x2020;Programa de Modelagem Computacional - SENAI - Cimatec, Salvador, Bahia, Brazil§INCT-GP, Petroleum Geophysiscs, Bahia - Brazil¶Universidade Federal da Bahia, Salvador, Bahia, Brazil)

Abstract

This work aims to numerically simulate the dynamics of a channel flow with an obstruction since the moment we inject a fluid with an homogeneous velocity profile. The simulations uses the open source tools of the OpenFOAM platform, the pisoFoam and the LES turbulence model, describing in detail the velocity profiles of laminar and turbulent flows. We also perform a boundary layer mapping in the presence of an obstacle. We used three different domains to follow the evolution of the velocity profile while the fluid progresses downstream and passes the obstruction. The results reproduce the well-known results of laminar flow in a channel, as well as the average velocity profile in the turbulent regime and the occurrence of attachments by the obstruction. These preliminary results are used to validate the solvers and the mesh used. Next, an analysis of the velocity profile dynamics resulted in determining an exponential decay of the root mean square deviations of the homogeneous to the parabolic, and to the turbulent regime in the channel.

Suggested Citation

  • G. da Silva Costa & F. Rodrigues Santos & D. Lira & I. C. da Cunha Lima & A. T. da Cunha Lima, 2021. "Dynamics of the nonequilibrium flow in a duct with obstruction," International Journal of Modern Physics C (IJMPC), World Scientific Publishing Co. Pte. Ltd., vol. 32(02), pages 1-13, February.
    • Handle: RePEc:wsi:ijmpcx:v:32:y:2021:i:02:n:s0129183121500169
    DOI: 10.1142/S0129183121500169
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