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Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Nonlinear structural stability and linear dynamic instability of transonic steady-states to a hydrodynamic model for semiconductors
跨音速稳态 非线性结构稳定性 线性动态不稳定性 半导体 流体动力学模型
2023/5/8
For unipolar hydrodynamic model of semiconductor device represented by Euler-Poisson equations, when the doping profile is supersonic, the existence of steady transonic shock solutions and C^\infty-sm...
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...
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 ...
This article traces the evolution of long range jet transport aircraft over the 50 years since Kuechemann founded the journal Progress in Aerospace Sciences. The article is particularly focused on tra...
Aerodynamic–Structural Design Studies of Low-Sweep Transonic Wings
Aerodynamic–Structural Design Studies Low-Sweep Transonic Wings
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...
An improved gas-kinetic BGK finite-volume method for three-dimensional transonic flow
Navier–Stokes equations BGK equation Kinetic scheme Finite-volume scheme
2015/7/2
During the past decade gas-kinetic methods based on the BGK simplification of the Boltzmann equation have been employed to compute fluid flow in a finite-difference or &#...
Aerodynamic Shape Optimization of Transonic and Supersonic Aircraft configurations
Aerodynamic Shape Optimization Transonic Supersonic Aircraft gurations
2015/7/2
With the availability of high performance computing platforms and robust numerical methods to simulate fluid flows, it is possible to shift attention to automated design procedures which u...
Exploring the Limits of Shock-free Transonic Airfoil Design
Exploring Limits Shock-free Transonic Airfoil Design
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...
DEVELOPMENT OF COMPUTATIONAL TECHNIQUES FOR TRANSONIC FLOWS:AN HISTORICAL PERSPECTIVE
COMPUTATIONAL TECHNIQUES RANSONIC FLOWS HISTORICAL PERSPECTIVE
2015/7/2
The history of computational fluid dynamics (CFD), especially as driven by the requirements of transonic flow prediction, has been largely coincident with the history of these Symposia. Th...
While aerodynamic prediction methods based CFD are now well estab lished, and quite accurate and robust, the ultimate need in the design process is to find the optimum shape which maximizes the ...
Artificial Diffusion, Upwind Biasing, Limiters and their Effect on Accuracy and Multigrid Convergence in Transonic and Hypersonic Flows
Artificial Diffusion, Upwind Biasing, Limiters Accuracy Multigrid Convergence Transonic Hypersonic Flows
2015/7/1
The theory of non-oscillatory scalar schemes is developed in this paper in terms of the local extremum diminishing (LED) principle that maxima should not increase and minima should not decrease.
Automatic Design of Transonic Airfoils to Reduce Reduce the Shock Induced Pressure Drag
Automatic Design Transonic Airfoils Shock Induced Pressure Drag
2015/7/1
This paper discusses the use of control theory for optimum design of aerodynamic configurations. Examples are presented of the application of this msethod to the reduction of shock induced press...
Paul Garabedian's Contributions to Transonic Airfoil and Wing Design
Transonic Airfoil Wing Design
2015/6/23
This note on Paul Garabedian's work on transonic airfoil and wing
design is written from the perspective of aeronautical engineering as well
as applied mathematics. Paul's contributions in this area...
Analysis of steady transonic isentropic flow in two dimensions
transonic isentropic flow aircraft affine transformation conformal mapping
2013/9/2
Firstly, this paper presents a new expression which changes the isentropic flow equation into Cauchy-Riemann quation, and the exact solution of subsonic flow around an arbitrary two dimensional body i...