Browsing by Author "Bai, R."
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Item Open Access Evidence and belief in regulatory decisions - Incorporating expected utility into decision modelling(Elsevier Science B.V., Amsterdam., 2012-12-31T00:00:00Z) Li, J.; Davies, Gareth J.; Kendall, Graham; Soane, Emma; Bai, R.; Rocks, Sophie A.; Pollard, Simon J. T.Recent changes in the assessment and management of risks has had the effect that greater importance has been placed on relationships between individuals and within groups to inform decision making. In this paper, we provide the theoretical underpinning for an expected utility approach to decision-making. The approach, which is presented using established evidence support logic (TESLA™), integrating the expected utilities in the forming of group decisions. The rationale and basis are described and illustrated through a hypothetical decision context of options for the disposal of animal carcasses that accumulate during disease outbreaks. The approach forms the basis for exploring the richness of risk-based decisions, and representing individual beliefs about the sufficiency of evidence they may advance in support of hypotheseItem Open Access Numerical investigation of the breakup mode and trajectory of liquid jet in a gaseous crossflow at elevated conditions(Cambridge University Press, 2021-09-13) Zhu, Yu; Sun, Xiaoxiao; Sethi, Vishal; Gauthier, Pierre; Guo, S.; Bai, R.; Yan, D.The commercial Computational Fluid Dynamics (CFD) software STAR-CCM+ was used to simulate the flow and breakup characteristics of a Liquid Jet Injected into the gaseous Crossflow (LJIC) under real engine operating conditions. The reasonable calculation domain geometry and flow boundary conditions were obtained based on a civil aviation engine performance model similar to the Leap-1B engine which was developed using the GasTurb software and the preliminary design results of its low-emission combustor. The Volume of Fluid (VOF) model was applied to simulate the breakup feature of the near field of LJIC. The numerical method was validated and calibrated through comparison with the public test data at atmospheric conditions. The results showed that the numerical method can capture most of the jet breakup structure and predict the jet trajectory with an error not exceeding ±5%. The verified numerical method was applied to simulate the breakup of LJIC at the real engine operating condition. The breakup mode of LJIC was shown to be surface shear breakup at elevated condition. The trajectory of the liquid jet showed good agreement with Ragucci’s empirical correlation.