This paper deals with the successful data and code transformation of a commercial CFD application, written in FORTRAN 77, to FORTRAN 90. It has been shown by means of the three-dimensional Euler and Navier-Stokes solver NSFLEX that the use of FORTRAN 90 features leads to more code quality and to much better performance options. In the current state NSFLEX 90 is an excellent starting point for further developments and investigations concerning vector, task, and data parallel realizations on multiprocessor architectures with different parallel programming paradigms. NSFLEX 90 is also the base using HPF (High Performance FORTRAN).

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