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Vortex suppression and drag reduction in the wake of counter-rotating cylinders
drag reduction instability control vortex interactions
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2015/7/3
The flow over a pair of counter-rotating cylinders is investigated numerically and experimentally. It is demonstrated that it is possible to suppress unsteady vortex shedding for gap sizes from ...
Automated Off-Body Cartesian Mesh Adaption for Rotorcraft Simulations
Automated Off -Body Cartesian Mesh Adaption Rotorcraft Simulations
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2015/7/3
A new adaptive mesh refinement strategy is presented that couples feature-detection with local error-estimation. The goal is to guide refinement to key vortical features using feature dete...
Adjoint-Based Aerodynamic Optimization of Supersonic Biplane Airfoils
Aerodynamic Optimization Supersonic Biplane Airfoils
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2015/7/3
This paper addresses the aerodynamic performance of Busemann-type supersonic biplanes at both design and off design conditions. An adjoint-based optimization technique is used to optimize the aerodyna...
High-order accurate simulations of unsteady flow past plunging and pitching airfoils
Spectral difference method Plunging Pitching
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2015/7/3
This paper presents simulations of unsteady flow past plunging and pitching airfoils using a high-order spectral difference (SD) method. Both third-order and fourth-order SD methods are employed...
In Pursuit of Grid Convergence for Two-Dimensional Euler Solutions
Grid Convergence Two-Dimensional Euler Solutions
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2015/7/3
Grid-convergence trends of two-dimensional Euler solutions are investigated. The airfoil geometry under study is based on the NACA0012 equation. However, unlike the NACA0012 airfoil, which has a blunt...
NLF Airfoil and Wing Design by Adjoint Method and Automatic Transition Prediction
NLF Airfoil Wing Design Adjoint Method Automatic Transition Prediction
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2015/7/3
This paper describes the application of optimization technique based on control theory for natural-laminar-°ow airfoil and wing design in viscous compressible °ow modeled by the Reynolds averaged Navi...
Design of Adjoint Based Laws for wing flutter control
Design Adjoint Based Laws wing fl utter control
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2015/7/2
An airplane, by its nature of being, is constructed so that it is as light as possible. The structural design is guided by static and dynamic factors. The more stringent constraints on the structural ...
Aerodynamic–Structural Design Studies of Low-Sweep Transonic Wings
Aerodynamic–Structural Design Studies Low-Sweep Transonic Wings
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2015/7/2
The current generation of wing designs for civilian air transport typically have a swept wing. However, these wings were designed without the aid of modern high-fidelity simulation and multidisc...
Multi-point Aero-Structural Optimization of Wings Including Planform Variations
Multi-point Aero-Structural Optimization Wings Planform Variations
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2015/7/2
This paper focuses on wing optimization via control theory using a multi-point design method. Based on the design methodology previously developed for wing section and planform optimization at a speci...
Optimal Control of LCOs in Aero-Structural Systems
Optimal Control LCOs Aero-Structural Systems
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2015/7/2
Aero-elastic systems, by their very nonlinear nature, frequently encounter Limit Cycle Oscillations (LCOs). An LCO occurs when the system being described reaches a periodic steady state where there is...
Multi-point Wing Planform Optimization via Control Theory
Multi-point Wing Planform Optimization via Control Theory
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2015/7/2
This paper focuses on wing optimization via control theory using a multi-point design method. Based on the design methodology previously developed for wing section and planform optimization at a speci...
Exploring the Limits of Shock-free Transonic Airfoil Design
Exploring Limits Shock-free Transonic Airfoil Design
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2015/7/2
In this study the limits of shock-free transonic airfoil design are explored via computa tional uid dynamics and shape optimization. Using an inviscid ow solver coupled with the adjoint method for sha...
Multi-Element High-Lift Configuration Design Optimization Using Viscous Continuous Adjoint Method
Multi-Element High-Lift guration Design Optimization Viscous Continuous Adjoint Method
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2015/7/2
An adjoint-based Navier–Stokes design and optimization method for two-dimensional multi-element high-lift configurations is derived and presented. The compressible Reynolds-averaged Navier–Stoke...
Aero-Structural Wing Planform Optimization Using the Navier-Stokes Equations
Aero-Structural Planform Optimization Navier-Stokes Equations
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2015/7/2
This paper describes the formulation of optimization techniques based on control theory for wing section and planform design in viscous compressible ow modeled by the Reynolds Averaged Navier-Stokes e...
Case Studies in Aero-Structural Wing Planform and Section Optimization
Aero-Structural Wing Planform Section Optimization
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2015/7/2
This paper focuses on aero-structural optimization of wing for long range transport aircraft, using Adjoint based optimization. The paper explores and compares attainable limit such as attainable L=D ...