Journal ArticleDOI
Perspective: Validation—What Does It Mean?
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It is shown that the definition-deduction approach is prone to misinterpretation, and that bottom-up descriptions rather than top-down legalistic Definitions are to be preferred for science-based engineering and journal policies, though legalistic definitions are necessary for contracts.Abstract:
Ambiguities, inconsistencies, and recommended interpretations of the commonly cited definition of validation for computational fluid dynamics codes/models are examined. It is shown that the definition-deduction approach is prone to misinterpretation, and that bottom-up descriptions rather than top-down legalistic definitions are to be preferred for science-based engineering and journal policies, though legalistic definitions are necessary for contracts.read more
Citations
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Journal ArticleDOI
Bayesian uncertainty analysis with applications to turbulence modeling
TL;DR: Bayesian uncertainty quantification techniques are applied to the analysis of the Spalart–Allmaras turbulence model in the context of incompressible, boundary layer flows and it is shown that by using both the model plausibility and predicted QoI, one has the opportunity to reject some model classes after calibration, before subjecting the remaining classes to additional validation challenges.
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Ten iterative steps for model development and evaluation applied to Computational Fluid Dynamics for Environmental Fluid Mechanics
Bert Blocken,Carlo Gualtieri +1 more
TL;DR: The retrospective analysis of the case studies indicates that the ten-steps approach is very well applicable to CFD for EFM and that it provides a comprehensive framework that encompasses and extends the existing best practice guidelines.
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Hydraulics of aerated flows: qui pro quo?
TL;DR: In turbulent free-surface flows, the deformation of the surface leads to air bubble entrainment and droplet projections when the turbulent shear stress is greater than the surface tension stress that resists to the interfacial breakup.
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Fluid-structure interactions in Francis turbines: A perspective review
Chirag Trivedi,Michel Cervantes +1 more
TL;DR: This work states that to attain a reliable and safe runner design, understanding of the structural response to flow-induced excitations is important.
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Validating predictions of unobserved quantities
TL;DR: A validation and predictive assessment process that supports extrapolative predictions for models with known sources of error and the proposed methodology is applied to an illustrative extrapolation problem involving a misspecified nonlinear oscillator.
References
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Book
Turbulence modeling for CFD
TL;DR: In this paper, the authors proposed a compressible ecoulement for compressible ECCs, based on the disquette reference record created on 2005-11-18, modified on 2016-08-08.
Journal ArticleDOI
Verification, Validation, and Predictive Capability in Computational Engineering and Physics
TL;DR: Verification and validation of computational simulations are the primary methods for building and quantifying this confidence in modeling and simulation.
Journal ArticleDOI
Features of a reattaching turbulent shear layer in divergent channel flow
David M. Driver,H. L. Seegmiller +1 more
TL;DR: In this article, experimental data have been obtained in an incompressible turbulent flow over a rearward-facing step in a diverging channel flow and mean velocities, Reynolds stresses, and triple products that were measured by a laser Doppler velocimeter are presented for two cases of tunnel wall divergence.
ReportDOI
DoD Modeling and Simulation (M&S) Verification, Validation, and Accreditation (VV&A),
TL;DR: This Instruction implements policy, assigns responsibilities, and prescribes procedures under DoD Directive 5000.59 for the verification, validation, and accreditation (VV&A) of DOD Modeling and Simulation (M&S).