NTCC Modules Library

NSCRUNCH

Abstract
A program to compute the moment (Fourier) expansion of a parametric two-dimensional grid representation. The moment expansion is computed at some critical surfaces, in general the first (non-singular) and last, and then interpolated across the grid. A constrained variational principle is applied to determine numerically the optimal parametric angle that minimizes the width of the power spectrum. at the first non-singular and last radial surface. Input data are two rank-one grid arrays (xin1d, yin1d) of size nt*ns, where nt is the number of poloidal points and ns the number of radial surfaces. Indices first iterate over the poloidal nodes and then over the radial surfaces: e.g. xin1d(k), k=(j-1)*nt + i, represents the "x" points at the i-th poloidal node and j-th radial surface. Output data are the COS and SIN radially dependent coefficients of "x" and "y".
DateOfInformation
Thr Jun 18 16:55:48 2009
Domain
Numerical Tools
Keyword
Moment, Fourier, parametric representation, minimization of the power spectrum width
Language
Fortran 90
Name
NSCRUNCH
TargetEnvironment
AIX, CRAY J90, HP-UX, IRIX64, Linux, OSF1, SunOS
Webpage
http://w3.pppl.gov/NTCC/Nscrunch
ContactIs
Alexander Pletzer

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http://w3.pppl.gov/rib/repositories/NTCC/objects/Asset/nscrunch.html


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