Search Results

1 - 10 of 13 items :

  • "vortex shedding" x
Clear All

of periodic ow solutions obtained by a POD-penalty method, Physica D: Nonlinear Phenomena, vol. 202, no. 3-4, pp. 218 - 237, 2005. 43. W. R. Graham, J. Peraire, and K. Y. Tang, Optimal control of vortex shedding using low-order models. Part I:open-loop model development, International Journal for Numerical Methods in Engineering, vol. 44, no. 7, pp. 945-972, 1999. 44. S. Makridakis, Accuracy measures: theoretical and practical concerns, International Journal of Forecasting, vol. 9, no. 4, pp. 527 - 529, 1993. 45. G. Stabile and G. Rozza, Stabilized Reduced order

of gas-liquid bubble flow using a vortex flow meter. Chemical Engineering Communications , 197 (2), 145-157. [9] Venugopal, A., Agrawal, A., Prabhu, S.V. (2011). Review on vortex flowmeter - Designer perspective. Sensors and Actuators A: Physical , 170 (1-2), 8-23. [10] Pankanin, G.L. (2005). The vortex flowmeter: Various methods of investigating phenomena. Measurement Science and Technology , 16 (3), R1-R16. [11] Itoh, I., Ohki, S. (1993). Mass flowmeter detecting fluctuations in lift generated by vortex shedding. Flow Measurement and Instrumentation , 4 (4

References Bao, Y., Wu, Q., Zhou, D., 2012. Numerical investigation of flow around an inline square cylinder array with different spacing ratios. Comput. Fluids, 55, 118-131. DOI: 10.1016/j.compfluid.2011.11.011. Celik, E., Rockwell, D., 2004. Coupled oscillations of flow along a perforated plate. Phys. Fluids, 16, 1714-1724, DOI: 10.1063/1.1661625. Ffowcs Williams, J.E., 1972. The acoustics of turbulence near sound-absorbent liners. J. Fluid Mech., 51, 737-749, DOI: 10.1017/S0022112072001338. Guillaume, D.W., LaRue, J.C., 2001. Comparison of the vortex shedding

Dynamic interaction of the cavitating propeller tip vortex with the rudder

The hydrodynamic interaction between the ship propeller and the rudder has many aspects. One of the most interesting is the interaction between the cavitating tip vortex shed from the propeller blades and the rudder. This interaction leads to strongly dynamic behaviour of the cavitating vortex, which in turn generates unusually high pressure pulses in its vicinity. Possibly accurate prediction of these pulses is one of the most important problems in the hydrodynamic design of a new ship. The paper presents a relatively simple computational model of the propeller cavitating tip vortex behaviour close to the rudder leading edge. The model is based on the traditional Rankine vortex and on the potential solution of the dynamics of the cylindrical sections of the cavitating kernel passing through the strongly variable pressure field in the vicinity of the rudder leading edge. The model reproduces numerically the experimentally observed process of initial compression of the vortex kernel in the high pressure region near the stagnation point at the rudder leading edge and subsequent explosive growth of the kernel in the low pressure region further downstream. Numerical simulation of this process enables computation of the additional pressure pulses generated due to this phenomenon and transmitted onto the hull surface. This new numerical model of the cavitating tip vortex is incorporated in the modified unsteady lifting surface program for prediction of propeller cavitation, which has been successfully used in the process of propeller design for several years and which recently has been extended to include the effects of propeller — rudder interaction. The results of calculations are compared with the experimental measurements and they demonstrate reasonable agreement between theory and physical reality.

Verlag, Düsseldorf 16. Krammer, P., 1982, “Computation of Unsteady Blade Forces in Turbomachines by Means of Potential Flow Theory and by Simulating Viscous Wakes”, ASME Paper 82-GT-198 17. Sieverding, C. H., Heinemann, H., 1990, “The Influence of Boundary Layer State on Vortex Shedding From Flat Plates and Turbine Cascades”, ASME Journal of Turbomachinery, vol. 112, pp. 181-187 18. Cicatelli, G., Sieverding, C. H., 1997, “The Effect of Vortex Shedding on the Unsteady Pressure Distribution Around the Trailing Edge of a Turbine Blade,” ASME Journal of Turbomachinery

., Paniagua, G., Michelassi, V., and Martelli, F.: Investigation of the Unsteady Rotor Aerodynamics in a Transonic Turbine Stage , ASME Journal of Turbomachinery, vol. 123, pp. 81-89, 2001. 14. Sieverding, C. H., and Heinemann, H.: The Influence of Boundary Layer State on Vortex Shedding From Flat Plates and Turbine Cascades , ASME Journal of Turbomachinery, vol. 112, pp. 181-187, 1990. 15. Cicatelli, G., and Sieverding, C. H.: The Effect of Vortex Shedding on the Unsteady Pressure Distribution Around the Trailing Edge of a Turbine Blade , ASME Journal of Turbomachinery

, 1999 11. Vandiver, J.K., Research challenges in the vortex-induced vibration prediction of marine risers, Proceedings of the OTC, Paper No. OTC 8098, Houston, USA, 1998. 12. Vengugopal, Madan, Damping and response prediction of a flexible cylinder in a current, Ph.D.Thesis submitted to Dept. of Ocean Eng. MIT. 1996. 13. Vikestad, K., (1998) Multi-frequency response of a cylinder subjected to vortex shedding and support motions. Ph.D. dissertation, Department of Marine Structures Faculty of Marine Technology, Norwegian University of Science and Technology

for isolated aqueduct bridge”, Engineering Structures 46: 28-37, 2013. 31. A. Flaga, “Wind vortex-induced excitation and vibration of slender structures. Single structure of circular cross-section normal to flow”, Monograph 202, Cracow, Poland, 1996. 32. A. Flaga, T. Lipecki, “Code approaches to vortex shedding and own model”, Engineering Structures 32: 1530-1536, 2010. 33. T. Lipecki, A. Flaga, “Vortex excitation model. Part I. Mathematical description and numerical implementation”, Wind & Structures 16(5): 457-476, 2013. 34. T. Lipecki, A. Flaga, “Vortex

through moving water-control gates by vortex method. Pt. I. Problem formulation , Archives of Civil and Mechanical Engineering, 2008, Vol. VIII, No. 3, 73-89. [11] LEWIS R.I., Vortex Element Methods for Fluid Dynamic Analysis of Engineering Systems , Cambridge University Press, London, 2005. [12] LIANG H., ZONGA Z., ZOUB L., ZHOUA L., SUNA L., Vortex shedding from a two-dimensional cylinder beneath a rigid wall and a free surface according to the discrete vortex method , European Journal of Mechanics B/Fluids, 2014, Vol. 43, 110-119. [13] MAJDA A.J., BERTOZZI A

steady flow past a circular cylinder at Reynolds numbers up to 100 . − J. Fluid Mech., vol.42, pp.471-489. [16] Fornberg B. (1980): A numerical study of steady viscous flow past a circular cylinder . − J. Fluid Mech., vol.98, pp.819-855. [17] Fornberg B. (1985): Steady viscous flow past a circular cylinder up to Reynolds number 600 . − J. Comput. Phys., vol.61, pp.297-320. [18] Henderson R.D. (1995): Details of the drag curve near the onset of vortex shedding . − Phys. Fluids, vol.7, pp.2102-2104. [19] Chen J.H. (2000): Laminar separation of flow past a circular