Tandem Analysis Effects on Bluff Bodies Aerodynamics


Authors : Mohammad Salem Alsubaiei; Saad Abdullah Alshatti

Volume/Issue : Volume 7 - 2022, Issue 12 - December

Google Scholar : https://bit.ly/3TmGbDi

Scribd : https://tinyurl.com/393w996r

DOI : https://doi.org/10.5281/zenodo.8150070

Abstract : Flow over the bluff body is considered an interesting topic that has long piqued the curiosity of aerodynamic experts because of its unusual flow behavior. Moreover, bluff bodies used in tandem have several technical applications, including high tower buildings, railways trains, industrial chimneys, and road vehicles, in addition to several other applications. Nevertheless, the non-streamed bodies with sharp leading ends are subjected to very high-pressure drag. Recognizing the flow through these bodies contributed to the design optimization and management of the field using passive or active techniques. Hence, the primary goal of this research is to quantitatively explain the flow field and effect of shielding of different square plates positioned concentrically as front bodies square flat- faced upstream sharp leading edges in addition to the rounded back rear body. Furthermore, this study considered a 3D analysis of the fluid flow behavior near the rear body alone, considering various geometrical combinations of gap ratios and width. Also, this study involves three Reynolds numbers depending on the rear body width, which is in the range of 1-1.8 ×105 were considered. Results were obtained using ANSYS- FLUENT (19.1) software depending on Computational- Fluid-Dynamic (CFD) applied to the K-Ɛ turbulence model to solve the general equations and, therefore, test the prepared models. The flow properties were simulated, involving the components of flow stream velocity, pressure distribution, and the Pressure- Coefficient (Cp) of the front-rear body and near the rear body alone combinations. Results showed that the most effective combination is achieved when the g/b2 value equals 0.5 b1/b2 value equals 0.75.This decrease is because of the impact of the front body's shielding, which causes separation streamlining on the front body's reattachment close to the shoulder of the rear body. Moreover, the instantaneous streamline velocity contour, as well as drag coefficient distributions, were computed. The obtained numerical results showed a good agreement with the experimental outcomes.

Keywords : Bluff Body, Computational-Fluid-Dynamic, ANSYS-FLUENT, Fluid Flow Behavior, Body's Shielding, Pressure-Coefficient (Cp).

Flow over the bluff body is considered an interesting topic that has long piqued the curiosity of aerodynamic experts because of its unusual flow behavior. Moreover, bluff bodies used in tandem have several technical applications, including high tower buildings, railways trains, industrial chimneys, and road vehicles, in addition to several other applications. Nevertheless, the non-streamed bodies with sharp leading ends are subjected to very high-pressure drag. Recognizing the flow through these bodies contributed to the design optimization and management of the field using passive or active techniques. Hence, the primary goal of this research is to quantitatively explain the flow field and effect of shielding of different square plates positioned concentrically as front bodies square flat- faced upstream sharp leading edges in addition to the rounded back rear body. Furthermore, this study considered a 3D analysis of the fluid flow behavior near the rear body alone, considering various geometrical combinations of gap ratios and width. Also, this study involves three Reynolds numbers depending on the rear body width, which is in the range of 1-1.8 ×105 were considered. Results were obtained using ANSYS- FLUENT (19.1) software depending on Computational- Fluid-Dynamic (CFD) applied to the K-Ɛ turbulence model to solve the general equations and, therefore, test the prepared models. The flow properties were simulated, involving the components of flow stream velocity, pressure distribution, and the Pressure- Coefficient (Cp) of the front-rear body and near the rear body alone combinations. Results showed that the most effective combination is achieved when the g/b2 value equals 0.5 b1/b2 value equals 0.75.This decrease is because of the impact of the front body's shielding, which causes separation streamlining on the front body's reattachment close to the shoulder of the rear body. Moreover, the instantaneous streamline velocity contour, as well as drag coefficient distributions, were computed. The obtained numerical results showed a good agreement with the experimental outcomes.

Keywords : Bluff Body, Computational-Fluid-Dynamic, ANSYS-FLUENT, Fluid Flow Behavior, Body's Shielding, Pressure-Coefficient (Cp).

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