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Multigrid Acceleration of Time-Accurate DNS of Compressible Turbulent FlowAn efficient scheme for the direct numerical simulation of 3D transitional and developed turbulent flow is presented. Explicit and implicit time integration schemes for the compressible Navier-Stokes equations are compared. The nonlinear system resulting from the implicit time discretization is solved with an iterative method and accelerated by the application of a multigrid technique. Since we use central spatial discretizations and no artificial dissipation is added to the equations, the smoothing method is less effective than in the more traditional use of multigrid in steady-state calculations. Therefore, a special prolongation method is needed in order to obtain an effective multigrid method. This simulation scheme was studied in detail for compressible flow over a flat plate. In the laminar regime and in the first stages of turbulent flow the implicit method provides a speed-up of a factor 2 relative to the explicit method on a relatively coarse grid. At increased resolution this speed-up is enhanced correspondingly.
Document ID
19970006866
Acquisition Source
Langley Research Center
Document Type
Conference Paper
Authors
Broeze, Jan
(Technische Hogeschool Twente Enschede, Netherlands)
Geurts, Bernard
(Technische Hogeschool Twente Enschede, Netherlands)
Kuerten, Hans
(Technische Hogeschool Twente Enschede, Netherlands)
Streng, Martin
(Technische Hogeschool Twente Enschede, Netherlands)
Date Acquired
August 17, 2013
Publication Date
September 1, 1996
Publication Information
Publication: Seventh Copper Mountain Conference on Multigrid Methods
Issue: Part 1
Subject Category
Fluid Mechanics And Heat Transfer
Accession Number
97N13759
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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