2018
DOI: 10.1108/ec-08-2017-0327
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Shape optimization of annular S-ducts by CFD and high-order polynomial response surfaces

Abstract: Purpose This paper aims to design an optimal shape for an annular S-duct, considering both energy losses and exit flow uniformity, starting from a given baseline design. Moreover, this paper seeks to identify the design factors that affect the optimal annular S-duct designs. Design/methodology/approach The author has carried out computational fluid dynamic (CFD)-based shape optimization relative to five distinct numerical objectives, to understand their interrelations in optimal designs. Starting from a give… Show more

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Cited by 14 publications
(9 citation statements)
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References 29 publications
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“…3a, and it could be understood that excluding small discrepancies near to both walls, predicted simulation and experimental results matched quite well. However, similar discrepancies were also reported by the Milanvoic et al and Immonen [40,42] because of the improper handling of the wall curvature by the turbulence model. Duenas [15] had also commented that it might be difficult the accurate prediction of flow under the highly curved wall surface by Boussinesq eddy-viscosity turbulence models.…”
Section: Numerical Methods Validationsupporting
confidence: 77%
See 1 more Smart Citation
“…3a, and it could be understood that excluding small discrepancies near to both walls, predicted simulation and experimental results matched quite well. However, similar discrepancies were also reported by the Milanvoic et al and Immonen [40,42] because of the improper handling of the wall curvature by the turbulence model. Duenas [15] had also commented that it might be difficult the accurate prediction of flow under the highly curved wall surface by Boussinesq eddy-viscosity turbulence models.…”
Section: Numerical Methods Validationsupporting
confidence: 77%
“…With the assumption of uniform flow without swirl at all circumferential direction of the S-shaped duct inlet, a 3-D S-shaped duct can be represented well by the approach of 2-D axisymmetric. This will reduce complexity as well as computational time for convergence of the fluid domain [2,15,19,38,40,41]. Modeling and meshing of the 2-D axisymmetric S-shaped duct are accomplished by using 'GAMBIT' software.…”
Section: Geometry Creation Meshing and Case Formationmentioning
confidence: 99%
“…Latin Hypercube Sampling scheme has been extensively used in a string of different ducts and channels optimization works. 9,14,19,4245…”
Section: Optimization Methodologymentioning
confidence: 99%
“…Recent reviews on this subject consider that the most popular are response surface models (RSMs), artificial neural networks (ANNs), radial basis functions (RBFs) and Kriging. 2,3 An optimization of annular S-duct shape in respect to energy losses and exit flow uniformity was performed by Immonen (2018) with use of polynomial regression surrogate. 9 After initial study, author decided to use high-order polynomial (order of 4 or 5) as the most appropriate for such class of problems.…”
Section: Introductionmentioning
confidence: 99%
“…Flow within the S-shaped duct is turbulent, and flow will significantly be affected by the boundary layers along duct walls as well. Hence, to resolve the viscous sub-layer, SST k-ω turbulence model with default model constants is selected for all 117 sets of simulations [26][27][28]. In the present paper, if the sum total of the normalized residual for each conservation equation is less than or equal to 10 −4 , the solution is considered as converge.…”
Section: Numerical Simulationmentioning
confidence: 99%