The aerospace plane design challenge: credible computational fluid dynamics results

Original publisher: Moffett Field, Calif. : NASA Ames Resarch Center, [1990] OCLC Number: (OCoLC)60248548 Excerpt: ... American Nudear Society and the American Society of Mechanical engineers have prepared, respectively, guidelines for V & V of scientific and engineering computer codes for the nuclear industry 4s and quality assurance requirements for computer software for nuclear facility applications. 4e The development of a software is by a process referred to as a " waterfall usually done model " or " software life-cycle phases. " Generally, the model passes through the following stages: requirements, preliminary design, detailed design, coding, integration and testing, installation and checkout, operation and maintenance, and retirement. The development is categorized either as precedented or unprecedented, the main difference between these two categories being the level of understanding of the requirements. The current development of computer codes for the CFD design process for aerospace planes falls into the unprecedented category ( Fig. 1 ). At the completion of technology development aerospace programs, the development of computer programs for the follow-on programs would be categorized as precedented developments. The defense and nuclear industries develop software for specific requirements and un-dertake the V & V process, which has a beginning and an end. But research institutes of-ten develop CFD codes to have " the ever-widening scope and accelerated pace of possible applications. ' ' 18 The futility of developing a code for a " wide range of applications " ( Fig. TM 1 of ReL 18 ) has been discussed previously; The numerical and physical models, such as numerical models satisfying the second law of thermodynamics and turbulence models, need to be developed and validated for possible wide applications, not codes. Codes are developed for specific applications, both for model validation by the research institutes and for design application ...