15 - Guest lectures

SYSTEMATIC CFD VERIFICATION - RESULTS FROM THE 2024 HIGH FIDELITY CFD VERIFICATION WORKSHOP

M. Galbraith, United States

A large number of Computational Fluid Dynamics (CFD) workshops have been held overrnthe past decade to both assess and advance the current state of the art. These workshops willrngenerally put forth a suite of test cases and participants from academia, industry, andrngovernments will attempt to compute fluid dynamic solutions to predict integrated quantitiesrnsuch as lift, drag, and moment coeffects, or local quantities such as velocity profiles andrnsurface pressure. Inevitably, when all the results are summarized, there is typically a widernscatter in the data. Some of this scatter can be explained by participants using different modelrnfidelities, such as Lattice-Boltzmann vs. Large Eddy Simulation (LES) vs. Reynolds AveragedrnNavier-Stokes (RANS), or using vastly different meshes, for example. Other differences arernless obvious. Most workshops will have multiple participants supposedly running the exactrnsame model yet obtaining different results. The sources of this discrepancies could stem fromrnlack of non-linear residual convergence, order of accuracy of the discretization, stabilizationrnterms, bugs in the software, or user input errors to name a few. The overarching goal of ThernHigh-Fidelity CFD Verification Workshop is to establish requirements to obtain consistentrnresults across a range of discretizations and solution schemes.

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