105 research outputs found
Computation of Turbulent Pitching Aerofoil Flows. G.U. Aero Report 9322
An unfactored implicit method for the unsteady, turbulent Navier-Stokes equations is adapted for pitching aerofoil flows. The mesh is moved rigidly with the aerofoil. Parameter tests on the method are presented. Test cases examined are from the AGARD aeroelastic configurations and involve the NACA0012 and NACA64A010 aerofoils. Detailed comparisons with experiment are presented
AF-CGS-P: an Unfactored Method in Parallel for Turbulent Pitching Aerofoil Flows. G.U. Aero Report 9323
An unfactored implicit method for the unsteady, turbulent Navier-Stokes equations is implemented in parallel. The algorithm uses the alternating direction implicit (ADI) method as a preconditioner for a conjugate gradient solution of the linear system at each time step. The sequential nature of the ADI process is tackled by using a transposition method to solve complete ADI sweeps on single processors. Results are presented for a standard pitching aerofoil case solved on the iPSC
Newton's Method for Steady Laminar Aerofoil Flows. G.U. Aero Report 9310
Newton’s method for steady laminar flows over aerofoils is examined
as a prelude to the study of more demanding unsteady flows. A simple
and fast method for approximating the Jacobian is proposed and various
conjugate gradient techniques are evaluated for the solution of the linear
system. Rapid convergence is demonstrated on two test cases
AF-CGS-P: an Unfactored Method in Parallel for Turbulent Pitching Aerofoil Flows. G.U. Aero Report 9323
An unfactored implicit method for the unsteady, turbulent Navier-Stokes equations is implemented in parallel. The algorithm uses the alternating direction implicit (ADI) method as a preconditioner for a conjugate gradient solution of the linear system at each time step. The sequential nature of the ADI process is tackled by using a transposition method to solve complete ADI sweeps on single processors. Results are presented for a standard pitching aerofoil case solved on the iPSC
An Investigation of Mesh Sequencing and Mesh Coarsening for the AF-CGS method. G.U. Aero Report 9411
The use of mesh sequencing as a way to speed up the convergence of the AF-CGS method is considered for the AGARD test case 9. A mesh refinement study is also carried out to determine a compromise mesh which will produce an accurate solution with fewer grid points
Computer Assisted Learning for Fluid Mechanics. G.U. Aero Report 9616.
No abstract available
Time Stepping Approaches for Three-Dimensional Transonic Viscous Flows. G.U. Aero Report 9412
A novel time-stepping approach is presented for the three-dimensional
thin-layer Navier-Stokes equations. The method involves a two factor
approximate factorisation and uses a preconditioned conjugate gradient
solution for one of the factors. The method has potential to provide most
of the advantages of a fully unfactored method without the huge memory
requirements. A partially implicit method is also considered. Results and
a stability analysis are presented to evaluate the approaches
The Application of an Unfactored Method to the Simulation of Nonlinear Aerofoil Responses: Part I - Verification for Inviscid Flows. G.U. Aero Report 9432
An unfactored solution method developed for the Navier-Stokes equations is applied to study the nonlinear aeroelastic response of an aerofoil. A loosely coupled approach is adopted with the structural equations and the flow equations being solved in sequence. The flow solver efficiency is compared with the standard ADI method and the results are compared with previous computations for the NACA64A006 aerofoil
An Investigation of Mesh Sequencing and Mesh Coarsening for the AF-CGS method. G.U. Aero Report 9411
The use of mesh sequencing as a way to speed up the convergence of the AF-CGS method is considered for the AGARD test case 9. A mesh refinement study is also carried out to determine a compromise mesh which will produce an accurate solution with fewer grid points
Unfactored Multiblock Methods: Part I - Initial Method Development. G.U. Aero Report 9511
The use of implicit multiblock methods is discussed and an unfactored method based on a conjugate gradient type solution is described. Preconditioners appropriate to multiblock are considered along with future extensions to parallel computing
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