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Exploring Alternative Approaches to CFD

Workshop Statement. Barriers to Progress and Technology DriversMisguided Government and Industry PoliciesNASA: No base R

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Exploring Alternative Approaches to CFD

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    1. Exploring Alternative Approaches to CFD Dimitri Mavriplis Dept.of Mechanical Engineering University of Wyoming Laramie, WY

    2. Workshop Statement Barriers to Progress and Technology Drivers Misguided Government and Industry Policies NASA: No base R&D budget, mission/vehicle emphasis Boeing: Lack of interest in technology/internal expertise Dell Computer Corp. Multiple Scales Anisotropy, Solver Stiffness, Mesh Refinement, Turbulence Software Complexity MDO, multiphase flow front tracking, education

    3. Technology Drivers High-Order Accuracy (Discontinuous Galerkin) Attempt to mitigate multiple-scale issue Large gains possible through more efficient approximations (temporal and spatial) Requires efficient solvers to realize gains More complex software Low-Order Accuracy: Simpler Models (Lattice Boltzmann) Simpler software More complex physics: Mesoscales Also requires efficient solvers

    4. CFD Accuracy for Drag Prediction (AIAA workshop results) Current simulations suffer from : Discretization errors Physical Modeling errors Apparently, one does not dominate the other (still)

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