Journal of Verification, Validation and Uncertainty Quantification: Recent submissions
Now showing items 121-140 of 207
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Overview of the 2018 Workshop on Iterative Errors in Unsteady Flow Simulations
(The American Society of Mechanical Engineers (ASME), 2020)Two workshops were held at the ASME V&V Symposiums of 2017 and 2018 dedicated to Iterative Errors in Unsteady Flow Simulations. The focus was on the effect of iterative errors on numerical simulations performed with ... -
Richardson Extrapolation: An Info-Gap Analysis of Numerical Uncertainty
(The American Society of Mechanical Engineers (ASME), 2020)Computational modeling and simulation is a central tool in science and engineering, directed at solving partial differential equations for which analytical solutions are unavailable. The continuous equations are generally ... -
Confidence-Based Uncertainty Quantification and Model Validation for Simulations of High-Speed Impact Problems
(The American Society of Mechanical Engineers (ASME), 2020)Validation exercises for computational models of materials under impact must contend with sparse experimental data as well as with uncertainties due to microstructural stochasticity and variabilities in thermomechanical ... -
Applicability of Common RANS Models for the Calculation of Transient Forced to Natural Convection
(The American Society of Mechanical Engineers (ASME), 2020)The applicability of several Reynolds averaged Navier–Stokes (RANS) turbulence models in calculating the transient evolution of a buoyancy-induced flow reversal along a vertical heated plate is analyzed through the use of ... -
Models, Uncertainty, and the Sandia V&V Challenge Problem
(The American Society of Mechanical Engineers (ASME), 2020)The purpose of this paper is not to present new results; rather, it is to show that the current approach to model validation is not consistent with the accepted mathematics of probability theory. Specifically, we argue ... -
A Visual Sensitivity Analysis for Parameter-Augmented Ensembles of Curves
(The American Society of Mechanical Engineers (ASME), 2020)Engineers and computational scientists often study the behavior of their simulations by repeated solutions with variations in their parameters, which can be, for instance, boundary values or initial conditions. Through ... -
Verification and Validation of Solar Photovoltaic Thermal Water Collectors Performance Using Fuzzy Logic
(The American Society of Mechanical Engineers (ASME), 2020)The performance of the solar photovoltaic (PV) module is more sensitive to its operating temperature. A PV module with a cooling system produces higher electrical power output than a PV module without a cooling system. In ... -
Analytic Solutions as a Tool for Verification and Validation of a Multiphysics Model
(The American Society of Mechanical Engineers (ASME), 2020)Computational physicists are commonly faced with the task of resolving discrepancies between the predictions of a complex, integrated multiphysics numerical simulation, and corresponding experimental datasets. Such efforts ... -
Assessment of RANS-Based Turbulence Models for Buoyancy-Influenced Forced Convection on a Heated Vertical Surface
(The American Society of Mechanical Engineers (ASME), 2020)Over the past 50 years, an industry-wide shift within the nuclear community has led to increased utilization of computational fluid dynamics (CFD) to supplement nuclear reactor safety (NRS) analyses. Although several “best ... -
Leveraging Adapted Polynomial Chaos Metamodels for Real-Time Bayesian Updating
(The American Society of Mechanical Engineers (ASME), 2020)As engineered systems face an ever-increasing array of threats, the ability to perform real-time predictions and decision-making is central for coping with potential menaces. For thorough real-time predictions, uncertainty ... -
A Practical Validation Assessment Workflow
(The American Society of Mechanical Engineers (ASME), 2020)Validation assessments should respond to a diverse set of stakeholders, each with different questions and needs relevant to validation. A single metric designed to address each validation need can inadvertently lead to ... -
A Modified Directional Flame Thermometer: Development, Calibration, and Uncertainty Quantification
(The American Society of Mechanical Engineers (ASME), 2020)The directional flame thermometer (DFT) is a robust device used to measure heat fluxes in harsh environments such as fire scenarios but is large when compared to other standard heat flux measurement devices. To better ... -
Verification, Validation, and Uncertainty Quantification of Spinal Rod Computational Models Under Three-Point Bending
(The American Society of Mechanical Engineers (ASME), 2020)Verification, validation, and uncertainty quantification (VVUQ) can increase confidence in computational models by providing evidence that a model accurately represents the intended reality of interest. However, there are ... -
An Investigation of Tooth Tip Leakages in Gerotor Pumps: Modeling and Experimental Validation
(The American Society of Mechanical Engineers (ASME), 2020)Gerotors are inexpensive positive displacement pumps commonly used in hydrostatic transmissions, fuel injection, and automotive lubrication systems. In these pumps, leakages at the tooth tips of the gears are the major ... -
Forensic Uncertainty Quantification for Experiments on the Explosively Driven Motion of Particles
(American Society of Mechanical Engineers (ASME), 2019)Six explosive experiments were performed in October 2014 and February of 2015 at the Munitions Directorate of the Air Force Research Laboratory with the goal of providing validation-quality data for particle drag models ... -
Assessment of Model Confidence of a Laser Source Model in xRAGE Using Omega Direct-Drive Implosion Experiments
(American Society of Mechanical Engineers (ASME), 2019)Los Alamos National Laboratory is interested in developing high-energy-density physics validation capabilities for its multiphysics code xRAGE. xRAGE was recently updated with the laser package Mazinisin to improve ... -
Verification and Validation of the FLAG Hydrocode for Impact Cratering Simulations
(American Society of Mechanical Engineers (ASME), 2019)Verification and validation (V&V) are necessary processes to ensure accuracy of the computational methods used to solve problems key to vast numbers of applications and industries. Simulations are essential for addressing ... -
Effective Convergence Checks for Verifying Finite Element Stresses at Three-Dimensional Stress Concentrations
(American Society of Mechanical Engineers (ASME), 2019)Current computational capabilities facilitate the application of finite element analysis (FEA) to three-dimensional geometries to determine peak stresses. The three-dimensional stress concentrations so quantified are useful ... -
Validation Metrics for Deterministic and Probabilistic Data
(American Society of Mechanical Engineers (ASME), 2019)Computational modeling and simulation are paramount to modern science. Computational models often replace physical experiments that are prohibitively expensive, dangerous, or occur at extreme scales. Thus, it is critical ... -
Grid-Induced Numerical Errors for Shear Stresses and Essential Flow Variables in a Ventricular Assist Device: Crucial for Blood Damage Prediction?
(American Society of Mechanical Engineers (ASME), 2019)Adverse events due to flow-induced blood damage remain a serious problem for blood pumps as cardiac support systems. The numerical prediction of blood damage via computational fluid dynamics (CFD) is a helpful tool for the ...