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Simulation of the Compressible Taylor Green Vortex using High-Order Flux Reconstruction Schemes
Compressible Taylor Green Vortex High-Order Flux Reconstruction Schemes
2015/7/6
In this paper, we investigate the ability of high-order Flux Reconstruction (FR) numerical schemes to perform accurate and stable computations of compressible turbulent ows on coarse meshes. Two new F...
Studies of Wings Supporting Non-unique Solutions in Transonic Flows
Wings Supporting Non-unique Solutions Transonic Flows
2015/7/6
Non-unique numerical solutions of transonic flows over airfoils have been found, first for potential flow equation, and later for Euler and RANS equations. The studies have also been...
Airfoils Supporting Non-unique Transonic Solutions for Unsteady Viscous Flows
Airfoils Supporting Non-unique Transonic Solutions Unsteady Viscous Flows
2015/7/6
Non-unique numerical solutions of transonic flows have been found, first for potential flow equation, and later for Euler and RANS equations. The studies conducted so far have been m...
Robust Airfoil Optimization Using Maximum Expected Value and Expected Maximum Value Approaches
Robust Airfoil Optimization Maximum Expected Value Expected Maximum Value Approaches
2015/7/3
Deterministic engineering design often leads to unexpected or physically unrealizable results. This is due to the fact that deterministic design is not able to capture the effects of even slight natur...
Further Studies of Mesh Refinement: Are Shock-Free Airfoils Truly Shock Free?
Mesh Refi nement Are Shock-Free Airfoils Truly Shock Free
2015/7/3
The Garabedian-Korn airfoil is studied at its inviscid design condition and in the neighborhood thereof. This airfoil was designed with a hodograph method to be shock-free at M = 0.750 and Cl = 0.629....
Optimization of Flow Past a Moving Deformable Airfoil using Spectral Difference Method
Optimization Flow Past Moving Deformable Airfoil Spectral Diff erence Method
2015/7/3
In this paper we examine the low Reynolds number flow past a harmonically plunging,pitching, and deforming airfoil, both individually and in combination. The lift and thrust characteristics of t...
Further Studies of Airfoils Supporting Non-Unique Solutions in Transonic Flow
Further Studies Airfoils Supporting Non-Unique Solutions Transonic Flow
2015/7/3
Non-unique solutions of the Euler equations were originally discussed by Jameson in 1991 (“Airfoil Admitting Non-Unique Solutions to the Euler Equations,” AIAA Paper 1991-1625, June 1991) for several ...
A Computational Framework for Low Reynolds Number 3D Flapping Wings Simulations
Computational Framework Low Reynolds Number 3D Flapping Wings Simulations
2015/7/3
This paper describes the work done in the development of a fast and accurate numerical solver for flows around flapping wings at low Reynolds numbers. In the first part, the fi...
Vortex suppression and drag reduction in the wake of counter-rotating cylinders
drag reduction instability control vortex interactions
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
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
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
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
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
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
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 ...