Browsing by Author "Manzoor, Raheela"

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Citation Count: Ghaffar, Abdul...et al. (2019). "Construction and Application of Nine-Tic B-Spline Tensor Product SS", Mathematics, Vol. 7, No. 8.
Construction and Application of Nine-Tic B-Spline Tensor Product SS
(MDPI, 2019) Ghaffar, Abdul; Iqbal, Mudassar; Bari, Mehwish; Hussain, Sardar Muhammad; Manzoor, Raheela; Nisar, Kottakkaran Sooppy; Baleanu, Dumitru; 56389
In this paper, we propose and analyze a tensor product of nine-tic B-spline subdivision scheme (SS) to reduce the execution time needed to compute the subdivision process of quad meshes. We discuss some essential features of the proposed SS such as continuity, polynomial generation, joint spectral radius, holder regularity and limit stencil. Some results of the SS using surface modeling with the help of computer programming are shown.
Citation Count: Manzoor, Raheela...et al. (2020). "Numerical Analysis of Fluid Forces for Flow Past a Square Rod with Detached Dual Control Rods at Various Gap Spacing", Symmetry-Basel, Vol. 12, No. 1.
Numerical Analysis of Fluid Forces for Flow Past a Square Rod with Detached Dual Control Rods at Various Gap Spacing
(2020) Manzoor, Raheela; Ghaffar, Abdul; Baleanu, Dumitru; Nisar, Kottakkaran Sooppy; 56389
A two-dimensional numerical study was conducted for flow past a square rod in the presence of two control rods. One is placed vertically in the upstream direction and the second one is placed horizontally in the downstream direction of the square rod. The influence of gap spacing was studied by taking g(1) = 1-5 and g(2) = 0.5-5 (where g(1) is the gap between the upstream control rod and the main rod, and g(2) is the space between the main rod and the downstream control rod) at Re = 160. The simulation results were obtained in the form of vorticity contour, drag and lift coefficients, Strouhal number, and force statistics. Under the effect of gap spacing, three different flow modes were found and named according to their behavior. It was found that the mean drag coefficient showed decreasing behavior by increasing the value of g(2) continually at a fixed value of g(1). The largest value of Cdmean was found at (g(1), g(2)) = (1, 1) and the greatest percentage reduction in Cdmean was obtained at (g(1), g(2)) = (1, 3), which is 139.72%. The effect of thrust was also noticed for all selected values of g(1) and g(2). Furthermore, it was noticed that the Strouhal number and the root mean square values of the drag and lift coefficients smaller values than the single rod values, except for the Clrms value of (g(1), g(2)) = (1, 3) and (1, 4).
Citation Count: Manzoor, Raheela...et al. (2020). "Numerical Simulation of Drag Reduction on a Square Rod Detached with Two Control Rods at Various Gap Spacing via Lattice Boltzmann Method", Symmetry-Basel, Vol. 12, No. 3.
Numerical Simulation of Drag Reduction on a Square Rod Detached with Two Control Rods at Various Gap Spacing via Lattice Boltzmann Method
(2020) Manzoor, Raheela; Khalid, Asma; Khan, Ilyas; Shams-Ul-Islam; Baleanu, Dumitru; Nisar, Kottakkaran Sooppy; 56389
Numerical simulations are performed to examine the effect of size of control rods (d1) and spacing ratio (g) on flow around a square rod with upstream and downstream control rods aligned in-line using the lattice Boltzmann method (LBM). The Reynolds number (Re) is fixed at Re = 160, while the spacing between the main rod and control rods is taken in the range 1 <= g <= 5 and the size of the control rod is varied between 4 and 20. Seven different types of flow mods are observed in this study at different values of g and d1. Variation in force statistics, like mean drag coefficient (C-dmean), Strouhal number (St), root mean square values of drag (C-drms) and lift coe fficients (C-lrms), and percentage reduction in mean drag coefficient is discussed in detail. It was examined that vortex shedding completely suppressed at (g, d1) = (1, 12), (2, 12), and (2, 16) where steady flow mode exists. Moreover, it was found that at large gap spacing, where g = 5, the effect of control rods on the main rod vanishes. Due to this strong vortex shedding produced and as a result, maximum value of C-dmean is found at (g, d1) = (5, 8). The negative values of mean drag force are also observed at some gap spacing and size of control rods are due to the effect of thrust. Furthermore, the maximum percentage reduction in C-dmean is 121%, found at (g, d1) = (2, 20).