Computational Fluid Dynamics Analysis of Self-Sustained Laminar Flow Oscillations in Singular Grooved Ducts

Yifei Chen; Stephen Tullis

doi:10.54097/e0txn789

Authors

Yifei Chen
Stephen Tullis

DOI:

https://doi.org/10.54097/e0txn789

Keywords:

Computational fluid dynamics, Low-Reynolds number, Laminar flow, Flow pulsations, OpenFOAM, Clusters.

Abstract

Research Background: Modeling oscillatory flow in singular grooved ducts within the laminar regime provides insight into fluid mechanics that could enhance applications such as heat transfer in nuclear reactors. Previous research has identified pulsations in grooved channels under turbulent conditions with high Reynolds numbers, contributing to enhanced heat exchange efficiency. These pulsations are influenced by the axial flow in and out of the main channel from a continuous groove. Contribution of This Study: This study extends the understanding of flow oscillations to simpler geometries and lower Reynolds numbers, specifically within a laminar flow regime capped at a Reynolds number of 2,000. By simplifying the duct geometry to a rectangular main channel with a singular continuous groove, the research employs computational fluid dynamics tools, primarily OpenFOAM, facilitated by Compute Canada's clusters. It investigates the fluid flow characteristics—strength, frequency, velocity gradient, and oscillation behaviours—associated with the geometry of the gaps and channels. This approach helps in pinpointing the dependency of flow characteristics on specific geometric configurations, potentially laying groundwork for optimizing designs in practical applications.

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References

[1] N. J. Spinks, “Candu Nuclear Power Reactors,” A-to-Z Guide to Thermodynamics, Heat and Mass Transfer, and Fluids Engineering, 2011. Available: https://doi.org/10.1615/atoz.c.candu_ nuclear_ power_reactors.

[2] J. D. Hooper, and K. Rehme, “Large-scale structural effects in developed turbulent flow through closely-spaced Rod Arrays,” Journal of Fluid Mechanics, vol. 145, no. 1, p. 305, 1984. Available: https://doi.org/10.1017/s0022112084002949. DOI: https://doi.org/10.1017/S0022112084002949

[3] L. Meyer, and K. Rehme, “Large-scale turbulence phenomena in compound rectangular channels,” Experimental Thermal and Fluid Science, vol. 8, no. 4, pp. 286–304, 1994. Available: https://doi. org/10. 1016/0894-1777(94)90059-0. DOI: https://doi.org/10.1016/0894-1777(94)90059-0

[4] L. Meyer, and K. Rehme, “Periodic vortices in flow through channels with longitudinal slots or fins,” in Tenth Symposium on Turbulent Shear Flows, The Pennsylvania State University, University Park, Pa., USA, Aug. 14-16, 1995.

[5] K. Rehme, “The structure of turbulent flow through Rod Bundles,” Nuclear Engineering and Design, vol. 99, pp. 141–154, 1987. Available: https://doi.org/10.1016/0029-5493(87)90116-6. DOI: https://doi.org/10.1016/0029-5493(87)90116-6

[6] M. Biemüller, L. Meyer, and K. Rehme, “Large eddy simulation and measurement of the structure of turbulence in two rectangular channels connected by a gap,” in Engineering Turbulence Modelling and Experiments, pp. 249–258, 1996. Available: https://doi.org/10.1016/b978-0-444-82463-9.50030-7. DOI: https://doi.org/10.1016/B978-0-444-82463-9.50030-7

[7] M. Renksizbulut, and G. I. Hadaller, “An experimental study of turbulent flow through a square-array rod bundle,” Nuclear Engineering and Design, vol. 91, no. 1, pp. 41–55, 1986. Available: https: //doi.org/10.1016/0029-5493(86)90183-4. DOI: https://doi.org/10.1016/0029-5493(86)90183-4

[8] Y. Fen Shen, Z. Dong Cao, and Q. Gang Lu, “An investigation of crossflow mixing effect caused by grid spacer with mixing blades in a rod bundle,” Nuclear Engineering and Design, vol. 125, no. 2, pp. 111–119, 1991. Available: https://doi.org/10.1016/0029-5493(91)90071-o. DOI: https://doi.org/10.1016/0029-5493(91)90071-O

[9] S. H. Hong, J. S. Seo, J. K. Shin, and Y. D. Choi, “Numerical investigation of turbulent flow pulsation in compound rectangular channels,” in Proceeding of Sixth International Symposium on Turbulence and Shear Flow Phenomena, 2009. Available: https://doi.org/10.1615/tsfp6.810. DOI: https://doi.org/10.1615/TSFP6.810

[10] J. Goulart, L. Noleto, and S. V. Möller, “Experimental study of mixing layer in a closed compound channel,” Journal of the Brazilian Society of Mechanical Sciences and Engineering, vol. 36, no. 2, pp. 411–420, 2013. Available: https://doi.org/10.1007/s40430-013-0081-3. DOI: https://doi.org/10.1007/s40430-013-0081-3

[11] A. Gosset, and S. Tavoularis, “Laminar flow instability in a rectangular channel with a cylindrical core,” Physics of Fluids, vol. 18, no. 4, 2006. Available: https://doi.org/10.1063/1.2194968. DOI: https://doi.org/10.1063/1.2194968

[12] S. Ethan, “Modeling Laminar Oscillatory Flow in Single Grooved Channels,” unpublished, 2021.

[13] M. S. Guellouz, F. Souissi, and N. Ben Salah, “The flow structure in the narrow gaps of compound channels: The basic flow,” Arabian Journal for Science and Engineering, vol. 45, no. 7, pp. 5447–5458, 2020. Available: https://doi.org/10.1007/s13369-020-04433-6. DOI: https://doi.org/10.1007/s13369-020-04433-6

[14] Halliday, D., Resnick, R., & Walker, J. (2001). Fundamentals of physics. Wiley.