Computational procedure for optimum shape design based on chained Bezier surfaces parameterization

Vučina, Damir; Lozina, Željan; Pehnec, Igor

doi:10.1016/j.engappai.2011.11.007

Cited by 10 publications

(1 citation statement)

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“…The idea is to use the vanes of the existing fan as the initial geometric solution for the process of evolutionary shape optimization, where different shape representation can be applied (Hardee et al, 1999;Dai et al, 2005;Rogers and Adams, 1976;Bohm et al, 1984;Farin, 1993). The authors of this paper have also studied a number of parameterizations (Vucina et al, 2012). The approach applied in this paper is to use 2D parametric entities to represent shape, in particular B-spline curves.…”

Section: Parameterization Of Fan Vane and Optimizationmentioning

confidence: 99%

Multi-Regime Shape Optimization of Fan Vanes for Energy Conversion Efficiency using CFD, 3D Optical Scanning and Parameterization

Milas

Vučina

Marinić-Kragić

2014

Engineering Applications of Computational Fluid Mechanics

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An enhanced reverse engineering procedure was developed for roof fan redesign. An original numerical workflow for robust shape optimization based on maximum energy conversion efficiency was developed. It operates using a sample of multiple operating regimes coupled with CFD simulations. The initial shape solution was originally obtained in point cloud form by optical 3D scanning and subsequent B-spline based parameterization of shape. The CFD simulation of the scanned shape using 3D RANS based software was shown to agree very well with the measured features, experimentally obtained in our lab with the actual initial-shape fan. By manipulating the control points of parametric curves, the developed evolutionary optimization workflow was subsequently able to create shape-optimized vanes. This original procedure was applied to cases of constant-thickness and profiled single curvature vanes, both for single-regime and robust multi-point operating conditions. The corresponding increase in efficiency gained by our computational procedure was correlated with respective velocity and pressure distributions and suppression of flow separation. The novel numerical procedure developed here therefore provides a numerical framework for generic object geometry to reshape itself autonomously. The change in shape ensures maximum energy conversion efficiency for a given composition of operating regimes. The gain in efficiency with optimized vane shapes proves to be significant in the wide range of flow rates around the best efficiency point.

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Section: Parameterization Of Fan Vane and Optimizationmentioning

confidence: 99%