scholarly journals High-Lift System Optimization Based on the Kriging Model Using a High-Fidelity Flow Solver

2006 ◽  
Vol 49 (165) ◽  
pp. 169-174 ◽  
Author(s):  
Masahiro KANAZAKI ◽  
Shinkyu JEONG ◽  
Kazuomi YAMAMOTO
Keyword(s):  
System Optimization ◽  
Kriging Model ◽  
High Fidelity ◽  
High Lift ◽  
Flow Solver

scholarly journals High-fidelity simulations of unsteady civil aircraft aerodynamics: stakes and perspectives. Application of zonal detached eddy simulation

2014 ◽  
Vol 372 (2022) ◽  
pp. 20130325 ◽  
Author(s):  
Sébastien Deck ◽  
Fabien Gand ◽  
Vincent Brunet ◽  
Saloua Ben Khelil
Keyword(s):  
Turbulent Flows ◽  
Hybrid Methods ◽  
Landing Gear ◽  
High Fidelity ◽  
Detached Eddy Simulation ◽  
High Lift ◽  
Eddy Simulation ◽  
Civil Aircraft ◽  
Aircraft Aerodynamics ◽  
Transonic Buffet

This paper provides an up-to-date survey of the use of zonal detached eddy simulations (ZDES) for unsteady civil aircraft applications as a reflection on the stakes and perspectives of the use of hybrid methods in the framework of industrial aerodynamics. The issue of zonal or non-zonal treatment of turbulent flows for engineering applications is discussed. The ZDES method used in this article and based on a fluid problem-dependent zonalization is briefly presented. Some recent landmark achievements for conditions all over the flight envelope are presented, including low-speed (aeroacoustics of high-lift devices and landing gear), cruising (engine–airframe interactions), propulsive jets and off-design (transonic buffet and dive manoeuvres) applications. The implications of such results and remaining challenges in a more global framework are further discussed.

scholarly journals Multi-Objective Aerodynamic Exploration of Elements’ Setting for High-Lift Airfoil Using Kriging Model

2006 ◽  
Vol 54 (632) ◽  
pp. 419-426 ◽  
Author(s):  
Masahiro Kanazaki ◽  
Shinkyu Jeong ◽  
Kentaro Tanaka ◽  
Kazuomi Yamamoto
Keyword(s):  
Kriging Model ◽  
High Lift ◽  
Multi Objective

scholarly journals Design Exploration of High-Lift Airfoil Using Kriging Model and Data Mining Technique

2007 ◽  
Vol 8 (2) ◽  
pp. 28-36 ◽  
Author(s):  
Masahiro Kanazaki ◽  
Kazuomi Yamamoto ◽  
Kentaro Tanaka ◽  
Shin-Kyu Jeong
Keyword(s):  
Data Mining ◽  
Kriging Model ◽  
Data Mining Technique ◽  
High Lift ◽  
Design Exploration ◽  
Mining Technique

Dynamic Analysis of Planar Solid Oxide Fuel Cell Models With Different Assumptions of Temperature Layers

2008 ◽  
Vol 6 (1) ◽  
Author(s):  
Handa Xi ◽  
Jing Sun
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Model Performance ◽  
System Optimization ◽  
Solid Oxide ◽  
High Fidelity ◽  
Oxide Fuel ◽  
Baseline Model ◽  
Trade Off ◽  
The Impact

As solid oxide fuel cell (SOFC) technology is rapidly evolving, high-fidelity mathematical models based on physical principles have become essential tools for SOFC system design and analysis. While several SOFC models have been developed by different groups using different modeling assumptions, little analysis of the effects of these assumptions on model performance can be found in literature. Meanwhile, to support system optimization and control design activities, a trade-off often has to be made between high fidelity and low complexity. This trade-off can be influenced by the number of temperature layers assumed in the energy balance to represent the SOFC structure. In this paper, we investigate the impact of the temperature layer assumption on the performance of the dynamic planar SOFC model. Four models of co-flow planar SOFCs are derived using the finite volume discretization approach along with different assumptions in the number of temperature layers. The model with four temperature layers is used as the baseline model, and the other models aimed at reducing the complexity of the baseline model are developed and compared through simulations as well as linear analysis. We show that the model with as few as two temperature layers—the solid structure and air bulk flow—is able to capture the dynamics of SOFCs, while assuming only one temperature layer results in significantly large modeling error.

Comparison of Dynamic Planar SOFC Models With Different Assumptions of Temperature Layers in Energy Balance

2006 ◽  
Author(s):  
Handa Xi ◽  
Jing Sun
Keyword(s):  
Energy Balance ◽  
Model Performance ◽  
System Optimization ◽  
Low Complexity ◽  
High Fidelity ◽  
Baseline Model ◽  
Trade Off ◽  
Depth Analysis ◽  
Design Activities ◽  
Finite Volume Approach

As Solid Oxide Fuel Cell (SOFC) technology is quickly developing and continuously evolving, high-fidelity mathematical models based on physical principles become essential tools for SOFC system design and analysis. Different modeling assumptions, however, are used by different groups, while in-depth analysis of influence of these assumptions on model performance can not be found in literature. Meanwhile, to support system optimization and control design activities, a trade-off often has to be made between high fidelity and low complexity. One factor that could define this trade-off is the number of temperature layers assumed to represent the SOFC structure. In this paper, we investigate different models for co-flow planar SOFCs that are derived using the finite volume approach with different assumptions of temperature layers in energy balance. The model with four temperature layers is used as the baseline model, and the other models aimed at reducing the complexity of the baseline model are developed and compared through simulations for different steady state and transient scenarios. Simulation results show that the model with as few as two temperature layers—solid structure and air flow—is able to capture the dynamics of SOFCs, while assuming only one temperature layer results in substantially different dynamic characteristics.

Application of Nonaxisymmetric Endwall Contouring to Conventional and High-Lift Turbine Airfoils

2013 ◽  
Vol 135 (6) ◽  
Author(s):  
T. J. Praisner ◽  
E. Allen-Bradley ◽  
E. A. Grover ◽  
D. C. Knezevici ◽  
S. A. Sjolander
Keyword(s):  
Design Methodology ◽  
Three Dimensional ◽  
Low Pressure ◽  
Free Form ◽  
Published Data ◽  
High Lift ◽  
Flow Solver ◽  
Low Pressure Turbine ◽  
Gradient Based ◽  
Endwall Contouring

Here, we report on the application of nonaxisymmetric endwall contouring to mitigate the endwall losses of one conventional and two high-lift low-pressure turbine airfoil designs. The design methodology presented combines a gradient-based optimization algorithm with a three-dimensional computational fluid dynamics (CFD) flow solver to systematically vary a free-form parameterization of the endwall. The ability of the CFD solver employed in this work to predict endwall loss modifications resulting from nonaxisymmetric contouring is demonstrated with previously published data. Based on the validated trend accuracy of the solver for predicting the effects of endwall contouring, the magnitude of predicted viscous losses forms the objective function for the endwall design methodology. This system has subsequently been employed to optimize contours for the conventional-lift Pack B and high-lift Pack D-F and Pack D-A low-pressure turbine airfoil designs. Comparisons between the predicted and measured loss benefits associated with the contouring for Pack D-F design are shown to be in reasonable agreement. Additionally, the predictions and data demonstrate that the Pack D-F endwall contour is effective at reducing losses primarily associated with the passage vortex. However, some deficiencies in predictive capabilities demonstrated here highlight the need for a better understanding of the physics of endwall loss-generation and improved predictive capabilities.

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