An Approach To Flow Engineering Via Functional Flow Modules

An Approach to Flow Engineering Via Functional Flow Modules

Complex three dimensional flow fields are seen to consist of identifiable, morphologically invariant, mildly interacting, flow structures or modules. Outputs of such flow fields such as wind loads, heat and mass transfer, flow quality, mixing, and pressure losses can be rationally established and with a knowledge of the modular structure. The paper discusses the modular approach for the case of flows around three-dimensional obstacles in boundary layers and for the case of tailoring free-stream flow and turbulence by flow inserts such as screens, perforated plates, honeycombs and foam slabs. (Author Modified Abstract).

Scientific and Technical Aerospace Reports

Instability and Transition

These two volumes contain the proceedings of the workshop on the Institute for Computer Instability and Transition, sponsored by Applications in Science and Engineering (ICASE) and the Langley Research Center (LaRC), during May 15 to June 9, 1989. The work shop coincided with the initiation of a new, focused research pro gram on instability and transition at LaRC. The objectives of the workshop were to (i) expose the academic community to current technologically important issues of instability and transition in shear flows over the entire speed range, (ii) acquaint the academic com munity with the unique combination of theoretical, computational and experimental capabilities at LaRC and foster interaction with these facilities, (iii) review current state-of-the-art and propose fu ture directions for instability and transition research, (iv) accelerate progress in elucidating basic understanding of transition phenomena and in transferring this knowledge into improved design methodolo gies through improved transition modeling, and (v) establish mech anisms for continued interaction. The objectives (i) to (iii) were of course immediately met. It is still premature to assess whether ob jectives (iv) and (v) are achieved. The workshop program consisted of tutorials, research presenta tions, panel discussions, experimental and computational demonstra tions, and collaborative projects.