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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...
Nodal Points and the Nonlinear Stability of High-Order Methods for Unsteady Flow Problems on Tetrahedral Meshes
Nodal Points Nonlinear Stability High-Order Methods Unsteady Flow Problems Tetrahedral Meshes
2015/7/3
High-order methods have the potential to efficiently generate accurate solutions to fluid dynamics problems of practical interest. However, high-order methods are less robust than lower-or...
Combined Feature-Driven Richardson-Based Adaptive Mesh Refinement for Unsteady Vortical Flows
Combined Feature-Driven Richardson-Based Adaptive Mesh Unsteady Vortical Flows
2015/7/3
An adaptive mesh refinement strategy that couples feature detection with local error estimation is presented. The strategyfirst selects vortical regions for refinement using feature ...
A p-multigrid spectral difference method for two-dimensional unsteady incompressible Navier–Stokes equations
Spectral difference method Artifi cial compressibility method Dual time stepping p-Multigrid
2015/7/3
This paper presents the development of a 2D high-order solver with spectral difference method for unsteady incompressible Navier–Stokes equations accelerated by a p-multigrid method. This solver is de...
An Extension of Energy Stable Flux Reconstruction to Unsteady,Non-linear,Viscous Problems on Mixed Grids
Extension Energy Stable Flux Reconstruction Unsteady Non-linear Viscous Problems Mixed Grids
2015/7/3
This paper extends the high-order Flux Reconstruction (FR) approach to the treatment of non-linear diffusive fluxes on triangles. The FR approach for solving diffusion problems is re...
An Artificial Compressibility Method for the Spectral Difference Solution of Unsteady Incompressible Navier-Stokes Equations on Multiple Grids
cial Compressibility Method erence Solution Unsteady Incompressible Navier-Stokes Equations Multiple Grids
2015/7/3
This paper presents the development of a 2D high-order solver with unstructured spectral difference method for unsteady incompressible Navier-Stokes equations.
Unsteady Adjoint Method for the Optimal Control of Advection and Burger’s Equations using High-Order Spectral Difference Method
Unsteady Adjoint Method Optimal Control Advection Burger’s Equations High-Order Spectral
2015/7/3
In this study, we investigate the method for adjoint-based optimal control of linear and non-linear equations. In particular, we are interested in the formulation of the unsteady adjoint method based ...
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...
Blending Dual Time Stepping and Newton-Krylov Methods for Unsteady Flows
Blending Dual Time Stepping Newton-Krylov Methods Unsteady Flows
2015/7/3
We explore the idea of using nonlinear schemes as preconditioners in Newton-Krylov schemes for unsteady flow computations. Analysis shows that left preconditioning changes the Newton scheme in a...
Nonlinear iterative solvers for unsteady Navier-Stokes equations
Nonlinear iterative solvers unsteady Navier-Stokes equations
2015/7/3
The application of nonlinear schemes like dual time stepping as preconditioners in matrix-free Newton-Krylov-solvers is considered and analyzed. We provide a novel formulation of the left precondition...
An Assessment of Dual-Time Stepping, Time Spectral and Artificial Compressibility based Numerical Algorithms for Unsteady Flow with Applications to Flapping Wings
Assessment Dual-Time Stepping Time Spectral Compressibility based Numerical Algorithms Unsteady Flow Flapping Wings
2015/7/3
The objective of this study is to compare and contrast three numerical algorithms that can be used to estimate the forces and pressure distribution on wings in flapping motion. All algorithms ar...
On nonlinear preconditioners in Newton–Krylov methods for unsteady flows
unsteady fl ows preconditioning Newton–Krylov methods matrix-free methods
2015/7/2
The application of nonlinear schemes like dual time stepping as preconditioners in matrix-free Newton Krylov-solvers is considered and analyzed, with a special emphasis on unsteady viscous flows...
Suppression of the unsteady vortex wakes of a circular cylinder pair by a doublet-like counter-rotation
vortex wakes instabilities vortex suppression numerical simulation virtual elliptic body fl ow control
2015/7/2
The present investigation examines the suppression of unsteady, two-dimensional wake instabilities of a pair of identical circular cylinders, placed side-by-side normal to freestream at a low Reynolds...
Optimum Shape Design for Unsteady Flows with Time-Accurate Continuous and Discrete Adjoint Methods
Optimum Shape Design Unsteady Flows Time-Accurate Continuous Discrete Adjoint Methods
2015/7/2
This paper presents an adjoint method for the optimal control of unsteady flows. The goal is to develop the continuous and discrete unsteady adjoint equations and their corresponding boundary co...
Three-Dimensional Unsteady Multi-stage Turbomachinery Simulations using the Harmonic Balance Technique
Three-Dimensional Unsteady Multi-stage Turbomachinery Simulations Harmonic Balance Technique
2015/7/2
In this paper, we propose an extension of the Harmonic Balance method for three dimensional, unsteady, multi-stage turbomachinery problems modeled by the Unsteady Reynolds-Averaged Navier-Stokes (URAN...