Abstract
The 2-D numerical study is performed to analyses the flow characteristic behind the elliptical structure placed near the wall for three different gap ratios as 0.25, 0.5, and 1.0. Computational domain and model is initially validated with the unbounded flow over a cylinder without considering wall effect for Reynolds number of 3900. For flow over the cylinder with near wall, computational domain is modelled as Blasius profile is the input to the area of interest. At different gap ratios the effect of boundary layer on vortex shedding is studied with Reynolds number of 1440. By applying different turbulent model for analysis, study the variation in the results and suggest the suitable model for the present type of study. It has been observed that the wall effect is predominant in case of the gap ratio of 0.25 as compared to other gap ratios.
Highlights
Flow across the different type of cylindrical structure is a very common in most of the engineering application which comprises of off shore structures, pipelines, economizer, condenser coils, shell and tube heat exchangers, and Heating, Ventilation, Air Conditioning & Refrigeration (HVAC&R) applications
Research continues in case of the rotating cylinder, as Atul Sharmal et al [2] investigated numerically heat flow and fluid flow around a rotating cylinder for Reynolds number from 20-160 maintained at constant temperature, and concluded that rotation acts as drag reduction and heat transfer suppression
The numerical analysis is initially performed for the unbounded cylinder by considering the various two equation turbulence model such as RNG k-epsilon, Std. k-epsilon, Realizable k-epsilon, and k-omega models at Reynolds number of 3900
Summary
Flow across the different type of cylindrical structure is a very common in most of the engineering application which comprises of off shore structures, pipelines, economizer, condenser coils, shell and tube heat exchangers, and Heating, Ventilation, Air Conditioning & Refrigeration (HVAC&R) applications. As the flow is viscous, the hydrodynamics associated with the plate viscous layer and turbulence created at the cylinder downstream is studied experimentally and numerically by number of researchers. Md. Mahbubar Rahman et al [1], numerically investigated flow over a cylinder using 2-D finite volume basis, and estimated the pressure and drag coefficient. Research continues in case of the rotating cylinder, as Atul Sharmal et al [2] investigated numerically heat flow and fluid flow around a rotating cylinder for Reynolds number from 20-160 maintained at constant temperature, and concluded that rotation acts as drag reduction and heat transfer suppression. Atul Sharma et al [7] studied effect of channel-confinement of various degree for the case of upwind flow around a heated/cooled square cylinder for Reynolds number = 100 and Prandle number= 0.7
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