Noise Analysis of a Limited-area Fine-mesh Prediction Model PDF Download
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Author: Joseph P. Gerrity
Publisher:
ISBN:
Category : Differential equations, Nonlinear
Languages : en
Pages : 92
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Book Description
"A diagnostic study of the mechanism responsible for producing high wavenumber oscillations (noise)in the numerical solution of the nonlinear equations governing a free surface, barotropic, atmospheric model is reported. The oscillations are identified as predominantly the result of the lattice of the difference equations and the boundary conditions employed to specified the solution. The analytic methods employed involved the use of space and time sections of the numerical solutions to provide a set of hypotheses. These are tested utilizing a one-dimensional linear analog of the model equations. The solution of the linear equations is obtained analytically, by the method of characteristics, and numerically. Several possibilities for removing the noise are suggested. Some improvement is demonstrated when the suggested methods are used in the linear one-dimensional analog.
Author: Joseph P. Gerrity
Publisher:
ISBN:
Category : Differential equations, Nonlinear
Languages : en
Pages : 92
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Book Description
"A diagnostic study of the mechanism responsible for producing high wavenumber oscillations (noise)in the numerical solution of the nonlinear equations governing a free surface, barotropic, atmospheric model is reported. The oscillations are identified as predominantly the result of the lattice of the difference equations and the boundary conditions employed to specified the solution. The analytic methods employed involved the use of space and time sections of the numerical solutions to provide a set of hypotheses. These are tested utilizing a one-dimensional linear analog of the model equations. The solution of the linear equations is obtained analytically, by the method of characteristics, and numerically. Several possibilities for removing the noise are suggested. Some improvement is demonstrated when the suggested methods are used in the linear one-dimensional analog.
Author: United States. National Weather Service
Publisher:
ISBN:
Category : Meteorological instruments
Languages : en
Pages : 46
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Author: National Meteorological Center (U.S.)
Publisher:
ISBN:
Category : Meteorological services
Languages : en
Pages : 374
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Author: Ronald D. McPherson
Publisher:
ISBN:
Category : Meteorological services
Languages : en
Pages : 44
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Author: Joseph P. Gerrity
Publisher:
ISBN:
Category : Hydrodynamic weather forecasting
Languages : en
Pages : 76
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1460
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Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: Joseph P. Gerrity
Publisher:
ISBN:
Category : Difference equations
Languages : en
Pages : 40
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Investigations of the computational stability of finite difference formulations of the equations governing shallow water, non-linear gravitational oscillations are reported. The investigations consist of empirical analyses of the results of numerical integration of the quasi-two-dimensional and fully two-dimensional versions of the equations. the results obtained in the quasi-two-dimensional experiments suggested the formulation of filters for use in approximating the non-linear terms. By filtering certain high frequency non-linear interactions, it is found possible to archive relatively well-behaved long term integrations. A number of efforts to extend this result to the fully two-dimensional equations are indicated. One procedure was found to be practically successful, but is finally rejected on the basis of the instability of its linear counterpart. The paper concludes a critique of possible extensions of the investigation.
Author: Paul D. Polger
Publisher:
ISBN:
Category : Meteorology
Languages : en
Pages : 30
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Author:
Publisher:
ISBN:
Category : Meteorology
Languages : en
Pages : 124
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Author:
Publisher:
ISBN:
Category : Meteorology
Languages : en
Pages : 1084
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