Form optimization and interaction analysis of plane symmetry prism in air

Abstract

In engineering, for many practical applications fluid-body interactions are commonly encountered and thereby these interactions have to be extensively studied. Though this body-fluid interaction is studied in the past, the concept of interaction analysis, form optimization relating to axis symmetry geometries till date mostly need to be further explored. The present work is devoted to the analysis of fluid (air) to body (prism) interaction, form (or shape) optimization taking into account various criteria and energy extraction from air flow by using an axial symmetric body (circular disc shaped geometry with alternate perforated quadrants) with plane symmetry (cylinders) is considered. A simplified mathematical model for engineering calculations is proposed. The model is based on the concept of pressure (compression) and suction zones, when a body is subjected to fluid (air) flow. Initially, all calculations are performed for the geometry under study in constant dimensions. Further, for better efficiency of the overall system, the system parameters are changed in constant continuous steps by a detailed analysis of the fluid-body interaction response surface. The mathematical model has the following assumptions: the fluid (air) flow is laminar, non-compressible (density constant) and the fluid (air) viscous is ignored. All the results obtained are discussed in graphs and explained. Three-dimensional fluid flow simulations are performed in ANSYS, steady state RANS is solved using Kε realizable turbulence model, the interaction force (Drag) is obtained for the geometry under study. Finally, the results relating to form (or shape) optimization and the application of the concept are widely discussed.

Modelling of Drag Force Reduction for a Waterjet Propulsion System

“…The authors used ANSYS software to study the interaction forces for the five different forms of the prism, and "boundary layers set to stair stepping with maximum of 7 layers" were used for each shape. The results of the study suggested that the pressure in the suction zone along the boundary layer was independent of the shape of the object with sufficient accuracy (about 2 %), and one could assume "a constant pressure in the boundary layer of the flow suction zone at low speeds" [15]. Considering the results above, in this study we focus on the resistance independent of the boundary layer.…”

“…The behaviour of differently shaped objects in the flow was presented by Vutukuru et al [15]. The authors used ANSYS software to study the interaction forces for the five different forms of the prism, and "boundary layers set to stair stepping with maximum of 7 layers" were used for each shape.…”

Modeling of water flow for waterjet propulsion system

“…During literature review we learned that modelling of flow over bluff bodies including cylinders is common, because it allows the user selecting the best operation mode, avoiding unsafe modes by eliminating the vortex shedding effect [1]. Extensive research is available on bluff body wakes [2] and some of the research was done before by our colleagues [3]. Meanwhile, modelling flow through the cylinder with cuts or holes is developing [4].…”