Assessment of different turbulence models in simulating axisymmetric flow in suddenly expanded nozzles

Authors

  • Sher Afghan Khan

  • Mir Owais Ali

  • Miah Mohammed Riyadh

  • Zahid Hossen

  • Nafis Mahdi Arefin

How to Cite

Afghan Khan, S., Owais Ali, M., Mohammed Riyadh, M., Hossen, Z., & Mahdi Arefin, N. (2018). Assessment of different turbulence models in simulating axisymmetric flow in suddenly expanded nozzles. International Journal of Engineering and Technology, 7(3.29), 243-248. https://doi.org/10.14419/ijet.v7i3.29.18804

Received date: September 2, 2018

Accepted date: September 2, 2018

Published date: August 24, 2018

DOI:

https://doi.org/10.14419/ijet.v7i3.29.18804

Keywords:

CFD, SST k-ω Model, ANSYS, NPR, Mach Number, Turbulence Models.

Abstract

A numerical simulation was carried out to compare various turbulence models simulating axisymmetric nozzle flow past suddenly expanded ducts. The simulations were done for L/D = 10. The convergent-divergent nozzle has been modeled and simulated using the turbulence models: The Standard k-ε model, The Standard k-ω model and The SST k-ω model. Numerical simulations were done for Mach numbers 1.87, 2.2, and 2.58 and the nozzles were operated for NPRs in the range from 3 to 11. From the numerical analysis it is apparent that for a given Mach number and effect of NPR will result in maximum gain or loss of pressure. Numerical results are in good agreement with the experimental results.

 

 

References

  1. [1] Frei, W. (2013). Which Turbulence Model Should I Choose for my CFD Application? Retrieved July 19, 2018, from http:// www. comsol. com/blogs /which-turbulence-model-should-choose-cfd-application/.

    [2] J. Sodja, “Turbulence models in CFD,†Univ. Ljubljana, no. March, pp. 1–18, 2007.

    [3] S. A. Khan and E. Rathakrishnan, “Active control of suddenly expanded flows from underexpanded nozzles - Part II,†Int. J. Turbo Jet Engines, vol. 22, no. 3, pp. 163–183, 2005.

    [4] S. A. Khan and A. Aabid, “Cfd Analysis of Cd Nozzle and Effect of Nozzle Pressure Ratio,†Int. J. Mech. Prod. Eng. Res. Dev., vol. 8, no. June, pp. 1147–1158, 2018.

    [5] N. A. Najar, D. Dandotiya, and F. A. Najar, “Comparative Analysis of K-Epsilon and Spalart-Allmaras Turbulence Models for Compressible Flow Through a Convergent-Divergent Nozzle,†Int. J. Eng. Sci., vol. 2, no. 8, pp. 8–17, 2013.

    [6] M. P. Bulat and P. V. Bulat, “Comparison of turbulence models in the calculation of supersonic separated flows,†World Appl. Sci. J., vol. 27, no. 10, pp. 1263–1266, 2013.

    [7] F. R. Menter, “Improved two-equation k-omega turbulence models for aerodynamic flows,†NASA Tech. Memo., no. 103978, pp. 1–31, 1992.

    [8] Anwar-ul-Haque, F. Ahmad, S. Yamada, and S. R. Chaudhry, “Assessment of Turbulence Models for Turbulent Flow over Backward Facing Step,†World Congr. Eng. 2007 Vol II, vol. II, pp. 1–6, 2007.

    [9] Tu, J., Yeoh, G. H., & Liu, C. (2013). Computational fluid dynamics: a practical approach Elsevier/Butterworth Heinemann.

    [10] M. A. A. Baig, S. A. Khan, C. Ahmed Saleel, and E. Rathakrishnan, “Control of base flows with micro jet for area ratio of 6.25,†ARPN J. Eng. Appl. Sci., vol. 7, no. 8, pp. 992–1002, 2012.

Downloads

How to Cite

Afghan Khan, S., Owais Ali, M., Mohammed Riyadh, M., Hossen, Z., & Mahdi Arefin, N. (2018). Assessment of different turbulence models in simulating axisymmetric flow in suddenly expanded nozzles. International Journal of Engineering and Technology, 7(3.29), 243-248. https://doi.org/10.14419/ijet.v7i3.29.18804

Received date: September 2, 2018

Accepted date: September 2, 2018

Published date: August 24, 2018