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An Ada 2012 binding to the FFTW fast Fouriertransform library
FFTW_Ada is an Ada binding to the FFTW (fast Fouriertransform) library written at MIT by Matteo Frigo and Steven G. Johnson. FFTW is written in C. FFTW_Ada allows calls to FFTW from an Ada program, thus allowing Ada code to compute fast Fourier and certain other related transforms. FFTW_Ada v2 works with FFTW v3 and requires Ada 2012.
Stress intensity factor (SIF) calculation from crack tip displacements
The code implements Muskhelishvili's complex function approach to calculate 2D stress intensity factors (modes I+II) from crack tip displacement fields. Surface displacements can be used with a plane stress elastic model. The code uses power/Fourier series expansion and a conformal mapping of an ellipse onto a circle.
Fast-Fourier-Transform-based number theory code to test Mersenne numbers for primality using the Lucas-Lehmer test and the Crandall-Fagin irrational-base discrete weighted transform (IBDWT) algorithm (Math. Computation 62 (205), pp.305-324, January 1994)