Investigations of the transitional and turbulent flows in rotor/stator cavities EuHIT Funded Project

Publications

  • Conference Paper
    Tuliszka-Sznitko, Ewa; Kiełczewski, Kamil
    Contributions to the Foundations of Multidisciplinary Research in Mechanics, edited by J.M. Floryan. 2017, Vol. 2, p. 1015.
    • Publication URL http://iutam.org/publications/ictam-proceedings/ictam_2016/
    • Keywords Taylor-Couette flow, DNS/SVV, PIV
    • Abstract The authors present the results obtained during a numerical investigations of the Tylor-Couette flow in configurations of aspect ratios 11.75 and 3.76, different radii ratios and end-wall boundary conditions. The main purpose of the research is to investigate the influence of geometrical parameters and end-walls boundary conditions on the flow structure, the torque fluctuations and its total values. The results are discussed in the light of Brauckmann, Eckhardt [1] and Dong [2] data obtained with periodicity condition in axial direction. The results are compared also with Wendt [3] experimental results. For the cavity of aspect ratio 3.76 the authors study the laminar-turbulent transition for the radii ratio from the range: 0.375 - 0.821 (the comparison with the EuHIT PIV results are presented). The authors have found that the transition from the three-cell structure to the one-cell structure occurs only for the lower ratios Computations are performed for Re up to 3100. All presented results have been obtained with the use of DNS/SVV method in which an artificial viscous operator is added to Laplace operator to stabilize the computational process for higher Reynolds numbers.
  • Conference Paper
    Tuliszka-Sznitko, Ewa; Kielczewski, Kamil
    Journal of Physics C.S.. 2016.
    • Publication URL http://iopscience.iop.org/article/10.1088/1742-6596/760/1/012035/pdf
    • Keywords Taylor-Couette flow, Nusselt number distribution, torque
    • Abstract he Taylor-Couette flow with radial temperature gradient is a canonical problem for the study of heat transfer in engineering issues. However, gaining insight into the transitional Taylor-Couette flow with temperature gradient still requires detailed experimental and numerical investigations. In the present paper we have performed computations for the cavity of aspect ratio Γ= 3.76 and radii ratios η= 0.82 and 0.375 with the heated rotating bottom disk and stationary outer cylinder. We analyse the influence of the end-wall boundary conditions and the thermal conditions on the flow structure, and on the distributions of the Nusselt number and torque along the inner and outer cylinders. The averaged values along the inner cylinder of the Nusselt number and torque obtained for different Re are analysed in the light of the results published in [2, 16, 17].
  • Article
    Tuliszka-Sznitko, Ewa; Kielczewski, Kamil
    Archives of Mechanics. 2016, Vol. 68, Issue 5, p. 395-418.
    • Publication URL http://am.ippt.pan.pl/am/issue/view/209
    • Keywords Taylor-Couette flow, torque, DNS
    • Abstract In the paper the authors present the results obtained during a direct numerical simulation of the transitional TC flow in closed cavity. The spectral vanishing viscosity method is used to stabilized computations for higher Re. The attention is focused on the influence of the end-wall boundary conditions on the flow structures and on statistics i.e. the radial profiles of the angular velocity, angular momentum, torque and the Reynolds stress tensor components. The obtained data are discussed in the light of the experimental results and the numerical results published in literature.
  • Conference Paper
    Tuliszka-Sznitko, Ewa; Kielczewski, Kamil
    "Computational Methods in Science and Technology". 2015, Vol. 21, p. 211.