Numerical investigation of momentum and thermal characteristics around a single cylinder and ellipsis, with various aspect ratios, in laminar flow with blockage

Flows around the circular cylinder have been the subject of studies for many years and have been studied extensively. On the other hand, studies on flow on elliptical cylinders are limited, especially at low Reynolds numbers. Intending to bridge the gap in the literature, the aspect ratio (GO) is between 0.33 ≤ GO ≤ 1 and the blockage ratio is between 0.333 ≤ BO ≤0,8 in different scenarios depending on the hydraulic diameter Re = 40, for uncompressed, laminar, continuous and two-dimensional flow The effect of blockage and aspect ratio on flow structure has been investigated. In the case of restricted flow, the cylinders are placed symmetrically between parallel walls. Under the specified boundary conditions, Navier-Stokes and energy equations were solved with Ansys-CFX 16.0 software. As a result of the analysis made over different scenarios, static pressure, surface shear stresses, Nusselt numbers, separation angles, pressure coefficients, friction coefficients, dimensionless velocity and dimensionless temperature values calculated. Besides, the effect of blockage and aspect ratio on hydrodynamic and thermal parameters was investigated. In scenarios where the aspect ratio is fixed and the blockage rate increases, it has been observed that the vortex size decreases with the increase of the blockage rate and in some cases does not occur. Depending on the blockage rate, the appearance ratio at which the vortex begins to appear differs, but for GO = 0.46 and GO=0,33 for all blockage rates, vortex formation was not observed. This result showed that there is a critical value in the range of 0.46