scholarly journals The three-dimensional Cauchy-condition surface method to reconstruct the last closed magnetic surface in non-axisymmetric fusion plasma

2013 ◽  
Author(s):  
M. Itagaki ◽  
K. Watanabe
Keyword(s):  
Three Dimensional ◽  
Magnetic Surface ◽  
Fusion Plasma ◽  
Surface Method

scholarly journals Three-dimensional Cauchy-condition surface method to identify the shape of the last closed magnetic surface in the Large Helical Device

2011 ◽  
Vol 53 (10) ◽  
pp. 105007 ◽  
Author(s):  
Masafumi Itagaki ◽  
Tadaaki Maeda ◽  
Takeshi Ishimaru ◽  
Gaku Okubo ◽  
Kiyomasa Watanabe ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Magnetic Surface ◽  
Surface Method

scholarly journals Optimization of Polymer Extrusion Die Based on Response Surface Method

Processes ◽  
2020 ◽  
Vol 8 (9) ◽  
pp. 1043 ◽  
Author(s):  
Amin Razeghiyadaki ◽  
Dichuan Zhang ◽  
Dongming Wei ◽  
Asma Perveen
Keyword(s):  
Three Dimensional ◽  
Theoretical Work ◽  
Optimization Method ◽  
Extrusion Die ◽  
Surface Method ◽  
Spline Fitting ◽  
Die Profile ◽  
Response Optimization ◽  
Geometric Variables ◽  
Volume Method

A coupled surface response optimization method with a three-dimensional finite volume method is adopted in this study to identify five independent geometric variables of the die interior that provides a design with the lowest velocity variance at the exit of the coat-hanger extrusion die. Two of these five geometric variables represent the manifold dimension while the other three variables represent the die profile. In this method, B-spline fitting with four points was used to represent the die profile. A comparison of the optimized die obtained in our study and the die with a geometry derived by a previous theoretical work shows a 20.07% improvement in the velocity distribution at the exit of the die.

Experimental and numerical investigation in failure of cracked aluminum plates repaired with bonded FML composite patch, under impact loading

2014 ◽  
Vol 21 (4) ◽  
pp. 493-503
Author(s):  
Lotfali Mozafari Vanani ◽  
Hamed Moayeri Kashani ◽  
Ali Pourkamali Anaraki ◽  
Faramarz Ashenai Ghasemi
Keyword(s):  
Energy Absorption ◽  
Metal Layer ◽  
Three Dimensional ◽  
Charpy Impact ◽  
J Integral ◽  
Element Analysis ◽  
Composite Patch ◽  
Crack Propagation Direction ◽  
Surface Method ◽  
Aluminum Plates

AbstractIn this paper, Charpy impact tests were conducted on cracked aluminum plates repaired with FML composite patches. The effects of the crack characteristics and patch lay-up sequence on the energy absorption of the specimens were investigated experimentally. In order to reduce the test numbers, the design of experiments method was used, and the results were predicted by response surface method. The effect of repairing on the fracture parameters [stress intensity factor (SIF), J-integral, and crack propagation direction (CPD)] at the crack front was calculated using three-dimensional (3D) finite element analysis. The results show that the value of the energy absorption increases when the crack angle increases and that the patch lay-up sequence has a significant role on the efficiency of the repair. When the location of the metal layer of the patch is near the repaired surface of the specimen, the value of the energy absorption increases.

scholarly journals Use of a twisted 3D Cauchy condition surface to reconstruct the last closed magnetic surface in a non-axisymmetric fusion plasma

2012 ◽  
Vol 54 (12) ◽  
pp. 125003 ◽  
Author(s):  
Masafumi Itagaki ◽  
Gaku Okubo ◽  
Masayuki Akazawa ◽  
Yutaka Matsumoto ◽  
Kiyomasa Watanabe ◽  
...  
Keyword(s):  
Magnetic Surface ◽  
Fusion Plasma

A Study on Improvement of Aerodynamic Performance for 100HP Axial Fan Blade and Guide Vane Using Response Surface Method

2019 ◽  
Author(s):  
Young-Seok Choi ◽  
Yong-In Kim ◽  
Sung Kim ◽  
Seul-Gi Lee ◽  
Hyeon-Mo Yang ◽  
...  
Keyword(s):  
Objective Function ◽  
Response Surface ◽  
Response Surface Method ◽  
Guide Vane ◽  
Three Dimensional ◽  
Flow Characteristics ◽  
Internal Flow ◽  
Aerodynamic Performance ◽  
Axial Fan ◽  
Surface Method

Abstract This paper describes the numerical optimization of an axial fan focused on the blade and guide vane (GV). For numerical analysis, three-dimensional (3D) steady-state Reynolds-averaged Navier-Stokes (RANS) equations with the shear stress transport (SST) turbulence model are discretized by the finite volume method (FVM). The objective function is enhancement of aerodynamic performance with specified total pressure. To select the design variables which have main effect to the objective function, 2k factorial design is employed as a method for design of experiment (DOE). In addition, response surface method (RSM) based on the central composite design applied to carry out the single-objective optimization. Effects on the components such as bell mouth and hub cap are considered with previous analysis. The internal flow characteristics between base and optimized model are analyzed and discussed.

Adjoint-Response Surface Method in Aerodynamic Shape Optimization of Turbomachinery Blades

2016 ◽  
Author(s):  
Xiao Tang ◽  
Jiaqi Luo ◽  
Feng Liu
Keyword(s):  
Cost Function ◽  
Response Surface ◽  
Response Surface Method ◽  
Design Space ◽  
Three Dimensional ◽  
Gradient Methods ◽  
Control Parameters ◽  
Surface Method ◽  
Optimization Stage ◽  
Turbomachinery Blades

An adjoint-response surface method is developed to give global representation of cost function in a parametrized design space for turbomachinery blades. Radial basis function (RBF) based and quadratic polynomial (QP) based response surface models are constructed using both the values of cost function and its adjoint gradients with respect to geometry control parameters. The method is tested on a quasi-three dimensional NACA0012 blade row, then applied to the transonic Rotor 67. In preliminary design optimization stage, when the number of undetermined control parameters is large, the QP based model can provide a global image of the cost function in high dimensional design space with a small amount of sample points. In two-parameter fine optimization stage, high resolution can be achieved with the RBF based models. This gradient-enhanced response surface method is useful in guiding designers to discover the global optimum which may be missed by local gradient methods in a complicated design space. It may also be used as substitute of CFD flow solver in time consuming iterative design and optimization.

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