Study the effect of changing the length of the triangle leading edge of a flat plate on the separation distance of the flow
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Abstract
There are two primary facets of the separated-reattached in this study. Translational flow from a flat plate with a triangle edge in three dimensions, simulated with a huge vortex using the Ansys Fluent CFD simulation. The consistency of the edge is the study's outcome as it looked at how to use an isosceles triangular edge to shorten the flow's separation length. Three different lengths of cases were recorded. We found that the mean length of the reattachment was 4 cm in the first case, where the triangle's edge length was 0.5 cm. We measured the mean length of the reattachment in the second example, where the triangle's edge was 1 cm, and in the third case, when the triangle's edge measured 1.5 cm, we found that the mean length of the reattachment was 1.8 cm. Based on our analysis, the optimal case is the third one. As the edge length increases, the mean reattachment length decreases.
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Taghinia, J., Rahman, M., and Siikonen, T., Large Eddy Simulation of Flow Past a Circular Cylinder with a Novel Sub-Grid Scale Model, European Journal of Mechanics B/Fluids, Vol. 52, pp. 11-18.X1,2015.
Alving A. E. and Fernholz H. H., Turbulence Measurements around a Mild Separation Bubble and Downstream of Reattachment, Journal of Fluid Mechanics, Vol. 322, pp. 297-328,1996.
Schreck, S. J. and Robinson, M. C., Horizontal Axis Wind Turbine Blade Aerodynamics Experiments and Modeling, IEEE Transactions on Energy Conversion, Vol. 22, No. 1, pp. 61-70,2007.
Bak, C., Madsen, H. A., Fuglsang, P., and Rasmussen, F., Observations and Hypothesis of Double Stall, Wind Energy, Vol. 2, No. 1, pp. 195-210,1999.
Rist, U. and Augustin, K., Control of Laminar Separation Bubbles Using Instability Waves, AIAA Journal, Vol. 44, No. 10, pp. 2217- 2223,2006.
Kiya, M. and Sasaki, K., Structure of a Turbulent Separation Bubble, Journal of Fluid Mechanics, Vol. 137, pp. 83–113,1983.
Cherry, N. J., Hillier, R., and Latour, M.E.M.P., Unsteady Measurements in a Separated and Reattaching Flow, Journal of Fluid Mechanics, Vol. 144, pp. 13-46,1984.
Tafti, D. K. and Vanka, S. P., A Three Dimensional Numerical Study of Flow Separation and Reattachment on a Blunt Plate, Physics of Fluids, Vol. 3, No. 12, pp. 2887-2909,1991.
Lee, I., and Sung, H. J., Characteristics of wall pressure fluctuations in separated and reattaching flow over a backward-facing step, Exp. Fluid, Vol. 30,pp. 262-272,2001.
Hudy, L. M., Naguib, A. M., Humphreys, W. M., Wall-pressure-array measurements beneath a separating/reattaching flow region, Phys. Fluid, Vol. 15, pp. 706-717,2003.
Castro, I. P., Haque, A., The Structure of a Turbulent Shear Layer Bounding a Separation Region, Journal of Fluid Mechanics, Vol. 179, pp. 439-468,1987.
Ruderich, R. and Fernholz, H. H., An experimental investigation of a turbulent shear flow with separation, reverse flow and reattachment, Journal of Fluid Mechanics, Vol. 163, pp. 283–322,1986.
Yang, Z., and Voke, P. R., Large-Eddy Simulation of Boundary Layer Separation and Transition at a Change of Surface Curvature, Journal of Fluid Mechanics, Vol. 439, pp. 305-333,2001.
Ducoin, A., Loiseau, J., and Robinet, J., Numerical Investigation of the Interaction between Laminar to Turbulent Transition and the Wake of an Airfoil, European Journal of Mechanics B/Fluids, Vol. 57, pp. 231- 248,2016.
Yang, Z., Numerical Study of Instabilities in Separated-Reattached Flows, Int. Journal of Comp. Meth. And Exp. Meas., Vol. 1, No. 2, pp. 116-131,2013
Abdalla I. E., Yang, Z., and Cook, M., Computational Analysis and Flow Structure of a Transitional Separated-Reattached Flow over a Surface Mounted Obstacle and a ForwardFacing Step, International Journal of Computational Fluid Dynamics, Vol. 23, No. 1, pp. 25–57,2009.
Spalart, P. R. and Strelets, M. K. Mechanisms of Transition and Heat Transfer in a Separation Bubble. J. Fluid Mech., 403: 329-349,2000.
McAuliffe, B. R. and Yaras, M. I. Numerical Study of Instability Mechanisms Leading to Transition in Separation Bubbles. ASME Journal of Turbomachinery, 130: 021006,2008.
Brinkerhoff, J. R. and Yaras, M. I. Interaction of Viscous and Inviscid Instability Modes in Separation-Bubble Transition. Physics of Fluids, 23, 124102,2011.
Brinkerhoff, J. R. and Yaras, M. I. Direct Numerical Simulations of Transitional Separation-Bubble Development in Swept-Blade Flow Conditions. Journal of Turbomachinery, 135: 041006,2013.
Gungora, A. G. and Simens, M. P. Transition to turbulence in a separated boundary layer with spanwise perturbations. IUTAM ABCM Symposium on Laminar Turbulent Transition, Science Direct, 14: 69-77, 2015.
D. K. Lilly, A proposed modification of the Germano subgrid‐scale closure method. Phys. vol. 4, pp. 633–635,1992. https://doi.org/10.1063/1.858280.
Niew, T. R. The Stability of the Flow in a Laminar Separation Bubble. PhD thesis, University of Cambridge,1993.
Kurelek, J. W., Burak, A. T., and Yarusevych, S.Three-Dimensional Vortex Development in a Laminar Separation Bubble formed over an Airfoil. 47th AIAA Fluid Dynamics Conference, 5-9 June 2017, Denver, Colorado: 3642,2017.
Sasaki, K. and Kiya, M. Three-Dimensional Vortex Structure in a Leading-Edge Separation Bubble at Moderate Reynolds Numbers. Journal of Fluids Engineering, 113: 405-410,1991.
Yang, Zhiyin & Abdalla, Ibrahim. On coherent structures in a separated/reattached flow. WSEAS Transactions on Fluid Mechanics 3:143-153. 3. 143-153, 2008..
Yang, Z. and Abdalla, I. E. Effects of Free-Stream Turbulence on Large-Scale Coherent Structures of Separated Boundary Layer Transition. Int. J. Numer. Meth. Fluids, 49: 331-348,2005.
Castro, L P. and Epik, E., Boundary Layer Development after a Separated Region, Journal of Fluid Mechanics, Vol. 374, pp. 91- 116,1998.