A comparative study of kriging variants for the optimization of a turbomachinery system. (January 2016)

• Record Type: Journal Article
• Authors: Bellary, Sayed; Samad, Abdus; Couckuyt, Ivo; Dhaene, Tom
• Is Part Of: Engineering with computers. Volume 32:Number 1(2016)
• Page Start: 49
• Page End: 59
• Publication Date: 2016-01
• Subjects: Blade angle -- Centrifugal impeller -- Hybrid genetic algorithm -- Hydraulic efficiency -- Kriging -- Design optimization -- Number of blades; Engineering design -- Data processing -- Periodicals; Computer-aided design -- Periodicals; Conception technique -- Informatique -- Périodiques; Conception assistée par ordinateur -- Périodiques; Electronic journals; 620.00285
• DOI: 10.1007/s00366-015-0398-x
• Languages: English
• ISSNs: 0177-0667

Abstract

Abstract Kriging is a well-established approximation technique for deterministic computer experiments. There are several Kriging variants and a comparative study is warranted to evaluate the different performance characteristics of the Kriging models in the computational fluid dynamics area, specifically in turbomachinery design where the most complex flow situations can be observed. Sufficiently accurate flow simulations can take a long time to converge. Hence, this type of simulation can benefit hugely from the computational cheap Kriging models to reduce the computational burden. The Kriging variants such as ordinary Kriging, universal Kriging and blind Kriging along with the commonly used response surface approximation (RSA) model were used to optimize the performance of a centrifugal impeller using CFD analysis. A Reynolds-averaged Navier–Stokes equation solver was utilized to compute the objective function responses. The responses along with the design variables were used to construct the Kriging variants and RSA functions. A hybrid genetic algorithm was used to find the optimal point in the design space. It was found that the best optimal design was produced by blind Kriging, while the RSA identified the worst optimal design. By changing the shape of the impeller, a reduction in inlet recirculation was observed, which resulted into an increase in efficiency.