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| Activity title | Lecture Series for Computational - Experimental Collaborations for Complex Analysis | Activity Reference | AVT-416 | Panel | AVT | Security Classification | NATO UNCLASSIFIED | Status | Active | Activity type | RLS | Start date | 2024-01-01T00:00:00Z | End date | 2025-12-31T00:00:00Z | Keywords | Complex Aerodynamics, Computational Fluid Dynamics, Validation Verification, Wind Tunnel Testing | Background | A pair of workshops (AVTs 284 and 338) assessed the state-of-the-art in the use of high-fidelity computational fluid dynamics (CFD) simulation of wind tunnel test section wall boundaries and model support hardware in wind tunnel facilities, and to compare results from high fidelity methods to established results. One of the objectives of these workshops was to identify key areas requiring further research and development, and subsequently ET-224 was formed to identify ‘Emerging Activities for Wind Tunnel Wall Boundary Simulations’. One of these emerging activities was identified as the need to encourage computational-experimental collaborations and disseminate the findings of various NATO AVT activities in the area to advance the knowledge of the state of the art. ET-235 was established to explore the potential of a Research Lecture Series (RLS) that covers these topics. | Objectives | The air vehicle community, including multiple AVTs, have recognized that, as wind tunnel and other methods of ground testing become more costly, the reliance on CFD for the design and qualification/certification of air vehicles depends on ensuring accuracy of these simulations, which includes validation. As part of the prior 284 and 338 AVTs, additional insights specifically relating to validation and complex physics has been explored, giving rise to the need to communicate findings from experts, AVTs, and workshops to the current and future generation aerodynamicists. Based on the work of ET-235, the objective of this activity is to gather these findings, along with sufficient background material on CFD and ground testing, to provide a lecture series on the state-of-the-art best practices, limitations, and future directions of experimental-computational collaborations for validation. | Topics | The topics will include, but limited to:
-Introduction to Ground Testing: Similarities and differences of flight regimes and testing apparatus, tunnel blockage, gas effects, testing for physics versus validation
-Introduction to Computational Methods: Equations, turbulence/transition models, mesh/time independence -- but not a CFD course
-Measurement Techniques: Capabilities, limitations, costs
-Defining the Computational and Ground Test Domains for Validation: Test characterization, boundary conditions, turbulent and boundary layer inflow
-Experimental Scaling: Mach, Reynolds, Froude, Lock
-Modern Analysis Techniques: Error bounds, steady, unsteady, machine learning (POD, DMD), roles of artificial intelligence
-Comparing Computation and Experiment Data: Disparate time and spatial scales; transition
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