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Wednesday, August 18, 2021 | History

3 edition of A perspective on unstructured grid flow problem solvers found in the catalog.

A perspective on unstructured grid flow problem solvers

A perspective on unstructured grid flow problem solvers

  • 320 Want to read
  • 31 Currently reading

Published by Institute for Computer Applications in Science and Engineering, NASA Langley Research Center, National Technical Information Service, distributor in Hampton, VA, [Springfield, Va .
Written in English

    Subjects:
  • Computational fluid dynamics.,
  • Computational grids.,
  • Euler equations of motion.,
  • Grid generation (Mathematics),
  • Navier-Stokes equation.,
  • Steady flow.,
  • Unsteady flow.

  • Edition Notes

    StatementV. Venkatakrishnan.
    SeriesICASE report -- no. 95-3., NASA contractor report -- 195025., NASA contractor report -- NASA CR-195025.
    ContributionsInstitute for Computer Applications in Science and Engineering.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15409965M


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A perspective on unstructured grid flow problem solvers Download PDF EPUB FB2

A PERSPECTIVE ON UNSTRUCTURED GRID FLOW SOLVERS V. Venkatakrishnan (NASA-CR) A PERSPECTIVE UNSTRUCTURED GRID FLOW SOLVERS Final Report (ICASE) 40 p GN N Unclas G364 Contract NAS February Institute for Computer Applications in Science and Engineering NASA Langley Research Center Hampton, VA   Perspective on unstructured grid flow solvers V.

Venkatakrishnan Institute for Computer Applications in Science and Engineering, NASA Cited by: CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): This survey paper assesses the status of compressible Euler and Navier-Stokes solvers on unstructured grids.

Di erent spatial and temporal discretization options for steady and unsteady ows are discussed. The integration of these components into an overall framework to solve practical problems is addressed.

However, most of the unstructured grid solver are devised based on the density based methods and most of the applications are limited to inviscid flows[1][2].

The density based method has long been recognized to face convergence problem at low speed where density is a weak function of pressure or independent of pressure (incompressible flow limit).

To study the effect of grid non-uniformity (i. variable aspect ratio of the grid) on the performance of the coupled solver, the driven flow in a skew cavity problem is solved on a series of structured and unstructured grid systems of different degree of non-uniformity and results (number of iterations and CPU times) are displayed in Table 4 Cited by: An unstructured grid flow solver was implemented on a massively parallel computer, and benchmark computations were performed.

The solver was a two-dimensional computational fluid dynamics (CFD) code that performs first-order, steady-state solutions of the Euler equations. The parallel computer employed was the Connection Machine made by Thinking Machines, Corp.

Book. Jan ; David Keyes. Ahmed Sameh A Perspective on Unstructured Grid Flow Solvers. This paper addresses the practical problem of obtaining convergence to steady state solutions of. The approach presented in this article is most closely related to the method introduced by Ding.

7 Consistent with his approach, we solve a fine grid problem and then compute upscaled wellblock. Unstructured flow solvers typically req uire more memory and have longer execution ti mes than structured grid solvers on a similar mesh.

D: Potential Benefits of Cartesian Grid Flo w Solvers. One method of 3D generation is based on the marching procedure of the parabolic generator. A grid adaptation strategy is included in flow field simulation.

Structured meshes are adapted to the flow gradients in boundary layers, wakes, solving the shocks, etc. A grid generation provides a key to the development of numerical methods. A Quadtree-based adaptive CartesianQuad grid flow solver for Navier-Stokes equations Computers Fluids, Vol.

27, No. 4 Application of a high-order reconstruction scheme to turbulent flow calculations using hybrid-Cartesian adaptive unstructured grids.

A number of approaches to the problem of using adaptive mesh refinement in large eddy simulations are considered and tested. These include unstructured and structured adaptive grids, various.

Higher-order Upwind Distribution-formula Scheme for Structured and Unstructured Adaptive Flow Solvers International Journal of Computational Fluid Dynamics, Vol. 17, No. 1 Evolution of Upstream Propagating Shock Waves From a Transonic Compressor Rotor.

A Voronoi-based ALE solver for the calculation of incompressible flow on deforming unstructured meshes 1 March | International Journal for Numerical Methods in Fluids, Vol.

65, No. 10 Blockage Effects on the Aerodynamics of a Pitching Wing. The solution sequence is organized into two iterative loops, as seen in Fig. 2: a) the inner loop and b) the outer the inner loop, also referred to as (constant) temperature cycle, new values of pressure and velocity are computed while keeping the temperature and total enthalpy each update of u and p, the density ρ is updated based on the new pressure value.

An unstructured grid, finite volume solver is used. The solver implements 2nd- 3rd- and 4th-order spectral finite volume methods, which use the Roe Riemann solver as the basic numerical flux scheme.

While numerous grid-based vorticity-velocity schemes are described in the literature (e. [,, ]), the numerical formulation embodied in Browns Vorticity Transport Model comprehensive rotorcraft analysis [12,13], and its derivative VorTran-M off-body flow solver [2,14], have shown particular promise with regards to efficiency and low.

3D Adaptive Unstructured Grid Solver: Application to Flow and GaAs Deposition in the Planetary Reactor An automatic adaptive meshing technique for Delaunay triangulations Computer Methods in Applied Mechanics and Engineering, Vol.

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It is well known that the ordering of the unknowns can have a significant effect on the convergence of preconditioned conjugate gradient (PCG) methods. There has been considerable experimental work. A new boundary treatment is proposed for the finite volume discrete Boltzmann method (FVDBM) that can be used for accurate simulations of curved boundaries and complicated flow conditions.

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Chapter 3 treats methods used to solve these flow equations. Chapter 4, then, takes a more detailed look at various implementations of these solutions methods. A discussion concerning the applicability of various flow models, solution methods and aerodynamic solvers to aircraft conceptual design is presented in Chapter 5.

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