Inscrição na biblioteca: Guest
Journal of Flow Visualization and Image Processing

Publicou 4 edições por ano

ISSN Imprimir: 1065-3090

ISSN On-line: 1940-4336

The Impact Factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) IF: 0.6 The Immediacy Index is the average number of times an article is cited in the year it is published. The journal Immediacy Index indicates how quickly articles in a journal are cited. Immediacy Index: 0.6 The Eigenfactor score, developed by Jevin West and Carl Bergstrom at the University of Washington, is a rating of the total importance of a scientific journal. Journals are rated according to the number of incoming citations, with citations from highly ranked journals weighted to make a larger contribution to the eigenfactor than those from poorly ranked journals. Eigenfactor: 0.00013 The Journal Citation Indicator (JCI) is a single measurement of the field-normalized citation impact of journals in the Web of Science Core Collection across disciplines. The key words here are that the metric is normalized and cross-disciplinary. JCI: 0.14 SJR: 0.201 SNIP: 0.313 CiteScore™:: 1.2 H-Index: 13

Indexed in

EFFECTS OF SIZE AND POSITION OF UPSTREAM CYLINDER ON WAKE TRANSITION IN FLOW PAST TWO IN-LINE SQUARE CYLINDERS

Volume 27, Edição 2, 2020, pp. 143-184
DOI: 10.1615/JFlowVisImageProc.2020030992
Get accessGet access

RESUMO

Two-dimensional numerical investigations of flow past two inline stationary square cylinders confined in a rectangular channel have been carried out using finite volume-based commercial software ANSYS Fluent 17.2. The flow field characteristics have been studied at different values of inter-cylinder spacing (S), flow Reynolds number (Re), and size ratio (SR is the ratio of side length of upstream cylinder to that of downstream cylinder). Effects of S, Re, and SR on the flow behavior in upstream and downstream wakes have been presented using vorticity contours. Critical Reynolds number for the onset of planar vortex shedding behind the downstream cylinder has been reported for different values of S and SR. It has been noted that wake transition behind the downstream cylinder depends on the values of S and SR, and the onset of unsteadiness gets delayed with increase in the size of the upstream cylinder for a given intercylinder spacing. Three different shedding modes, viz., single slender body, reattachment mode, and binary mode, have been illustrated using vorticity contours. Temporal wake oscillations have been examined using Hilbert-Huang transformation of time varying signals of force coefficient. Extent of nonlinear interactions and their effect on frequency distribution have been presented in the Hilbert and marginal spectra and quantified in terms of the degree of stationarity. Variation in lift and drag coefficients on upstream and downstream cylinders has also been reported for different values of Re, S, and SR.

Referências
  1. Anagnostopoulos, P. and Seitanis, S.A., Numerical Study of Aperiodic Phenomena past Two Staggered Rows of Cylinders in Cross-Flow, Ocean Eng., vol. 92, pp. 212-233, 2014.

  2. Balachandar, S. and Parker, S.J., Onset of Vortex Shedding in an Inline and Staggered Array of Rectangular Cylinders, Phys. Fluids, vol. 14, no. 10, pp. 3714-3732, 2002.

  3. Chatterjee, D. and Gupta, S.K., Convective Transport around Rows of Square Cylinders Arranged in a Staggered Fashion at Moderate Reynolds Number, Numer. Heat Transfer, Part A: Applications, vol. 68, no. 4, pp. 388-410, 2015.

  4. Franke, R., Rodi, W., and Schonung, B., Numerical Calculation of Laminar Vortex-Shedding Flow past Cylinders, J. Wind Eng. Ind. Aerodyn., vol. 35, no. 1, pp. 237-257, 1990.

  5. Huang, N.E., Shen, Z., Long, S.R., Wu, M.C., Shih, H.H., Zheng, Q., Yen, N.C., Tung, C.C., and Liu, H.H., The Empirical Mode Decomposition and the Hilbert Spectrum for Nonlinear and Non-Stationary Time Series Analysis, Proc Roy. Soc. London A: Math., Phys. Eng. Sci., vol. 454, pp. 903-995, 1998.

  6. Kumar, P., Manelil, N.P., and Tiwari, S., Effects of Shear Intensity and Aspect Ratio on Three-Dimensional Wake Characteristics of Flow past Surface Mounted Circular Cylinder, Phys. Fluids, vol. 31, no. 4, p. 043602 (1-23), 2019.

  7. Lam K., Gong, W.Q., and So, R.M.C., Numerical Simulation of Cross-Flow around Four Cylinders in an In-Line Square Configuration, J. Fluids Struct., vol. 24, no. 1, pp. 34-57, 2008.

  8. Lankadasu, A. and Vengadesan, S., Onset of Vortex Shedding in Planar Shear Flow past a Square Cylinder, Int. J. Heat Fluid Flow, vol. 29, no. 4, pp. 1054-1059, 2008.

  9. Luo, S.C., Tong, X.H., and Khoo, B.C., Transition Phenomena in the Wake of a Square Cylinder, J. Fluids Struct., vol. 23, no. 2, pp. 227-248, 2007.

  10. Manelil, N.P. and Tiwari, S., Wake Characteristics of a Sphere Performing Streamwise Rotary Oscillations, Eur. J. Mech./B Fluids, vol. 72, pp. 485-500, 2018.

  11. Patil, P.P. and Tiwari, S., Effect of Blockage Ratio on Wake Transition for Flow past Square Cylinder, Fluid Dyn. Res., vol. 40, nos. 11-12, pp. 753-778, 2008.

  12. Paul, I., Prakash, K.A., and Vengadesan, S., Onset of Laminar Separation and Vortex Shedding in Flow past Unconfined Elliptic Cylinders, Phys. Fluids, vol. 26, no. 2, p. 023601, 2014.

  13. Saha, A.K., Muralidhar, K., and Biswas, G., Vortex Structures and Kinetic Energy Budget in Two Dimensional Flow past a Square Cylinder, Comput. Fluids, vol. 29, no. 6, pp. 669-694, 2000.

  14. Sahu, A.K., Chhabra, R.P., and Eswaran, V., Two-Dimensional Unsteady Laminar Flow of a Power Law Fluid across a Square Cylinder, J. Non-Newtonian Fluid Mech., vol. 160, nos. 2-3, pp. 157-167, 2009.

  15. Sen, S., Mittal, S., and Biswas, G., Flow past a Square Cylinder at Low Reynolds Numbers, Int. J. Num er. Meth. Fluids, vol. 67, no. 9, pp. 1160-1174, 2011.

  16. Sewatkar, C.M., Sharma, A., and Agrawal, A., On the Effect of Reynolds Number for Flow around a Row of Square Cylinders, Phys. Fluids, vol. 21, no. 8, pp. 1-13, 2009.

  17. Sharma, A. and Eswaran, V., Heat and Fluid Flow across a Square Cylinder in the Two-Dimensional Laminar Flow Regime, Numer. Heat Transf., Part A: Applications, vol. 45, no. 3, pp. 247-269, 2004.

  18. Sohankar, A., Norberg, C., and Davidson, L., Low-Reynolds Number Flow around Square Cylinders at Incidence: Study of Blockage, Onset of Vortex Shedding and Outlet Boundary Condition, Int. J. Numer. Meth. Fluids, vol. 26, no. 1, pp. 39-56, 1998.

  19. Sohankar, A., Norberg, C., and Davidson, L., Simulation of Three-Dimensional Flow around a Square Cylinder at Moderate Reynolds Numbers, Phys. Fluids, vol. 11, no. 2, pp. 288-306, 1999.

  20. Turki, S., Abbassi, H., and Nasrallah, S.B., Two-Dimensional Laminar Fluid Flow and Heat Transfer in a Channel with a Built-in Square Cylinder, Int. J. Therm. Sci., vol. 42, no. 12, pp. 1105-1113, 2003.

  21. Vu, H.C., Ahn, J., and Hwang, J.H., Numerical Simulation of Flow Past Two Circular Cylinders in Tandem and Side-by-Side Arrangement at Low Reynolds Numbers, KSCE J. Civil Eng., vol. 20, no. 4, pp. 1594-1604, 2016.

  22. Yen, S.C., San, K.C., and Chuang, T.H., Interactions of Tandem Square Cylinders at Low Reynolds Numbers, Exp. Therm. Fluid Sci., vol. 32, no. 4, pp. 927-938, 2008.

Portal Digital Begell Biblioteca digital da Begell eBooks Diários Referências e Anais Coleções de pesquisa Políticas de preços e assinaturas Begell House Contato Language English 中文 Русский Português German French Spain