Current capabilities and future directions in computational fluid dynamics

Original publisher: Washington, D.C. : National Academy Press : Available from Aeronautics and Space Engineering Board, National Research Council, 1986. OCLC Number: (OCoLC)406341951 Excerpt: ... 5 LES to develop for use in critical portions of complex turbulent is it LTPS bUt time, if befGie be plied to full aircraft flow. Full turbulence simulations ( FTS ) ( all a scales ) will be limited to simple flows at relatively low Reynolds numbers. While useful in fundamental studies of turbulence, the FTS limitations are such that they are not likely to find much use in engineering applications in the foreseeable future. Hence, some form of turbulence modeling, and modeling transition, is of expected to remain an essential element for engineering CFD. flows, It in the most complicated where intuition fails and is basic experiments are missing, that the turbulence models perform most poorly. With the advent of effective methods for solving the flow equations, the inadequacies of turbulence modeling may be-come the pacing item in the future application of CFD to practical vehicle design. The other items pacing the development of engineering CFD as are more amenable to rapid advance, has already been shown in the case of grid generation, algorithms, and hardware. Solving the turbulence problem is tough, long-standing issue of growing im-a portance that will require sustained attention by many interacting, highly competent groups. The current level of effort in the development better turbu-of a lence model8 limited. The advent of FTS tool for gather-as is ing data about turbulent flows, advances in the methodology of rational structuring of models, and new experimental techniques offers promise for more rapid advances in turbulence modeling. RECOMMENDATIONS a The ultimate for CFD is the development of fully ma-goal is ture capability that user-friendly, cost-effective, and fully verified by detailed experimental comparison. The committee feels that ag-order-of-magnitud...