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Building Blocks for Reliable Complex Nonlinear Numerical SimulationsThis talk describes some of the building blocks to ensure a higher level of confidence in the predictability and reliability (PAR) of numerical simulation of multiscale complex nonlinear problems. The focus is on relating PAR of numerical simulations with complex nonlinear phenomena of numerics. To isolate sources of numerical uncertainties, the possible discrepancy between the chosen partial differential equation (PDE) model and the real physics and/or experimental data is set aside. The discussion is restricted to how well numerical schemes can mimic the solution behavior of the underlying PDE model for finite time steps and grid spacings. The situation is complicated by the fact that the available theory for the understanding of nonlinear behavior of numerics is not at a stage to fully analyze the nonlinear Euler and Navier-Stokes equations. The discussion is based on the knowledge gained for nonlinear model problems with known analytical solutions to identify and explain the possible sources and remedies of numerical uncertainties in practical computations. Examples relevant to turbulent flow computations are included.
Document ID
20030001841
Acquisition Source
Ames Research Center
Document Type
Conference Paper
Authors
Yee, H. C.
(NASA Ames Research Center Moffett Field, CA United States)
Mansour, Nagi N.
Date Acquired
August 21, 2013
Publication Date
July 10, 2002
Subject Category
Computer Programming And Software
Meeting Information
Meeting: CNLS 22nd Annual International Conference: Frontiers of Simulation
Location: Los Alamos, NM
Country: United States
Start Date: August 19, 2002
End Date: August 23, 2002
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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