Initial-value ordinary differential equation solution via variable order Adams method (SIVA/DIVA) package is collection of subroutines for solution of nonstiff ordinary differential equations. There are versions for single-precision and double-precision arithmetic. Requires fewer evaluations of derivatives than other variable-order Adams predictor/ corrector methods. Option for direct integration of second-order equations makes integration of trajectory problems significantly more efficient. Written in FORTRAN 77.

Solving Ordinary Differential Equations

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Numerical Heat Transfer And Fluid Flow

Energy use in cities has attracted significant research in recent years. However such a broad topic inevitably results in number of alternative interpretations of the problem domain and the modelling tools used in its study. This paper seeks to pull together these strands by proposing a theoretical definition of an urban energy system model and then evaluating the state of current practice. Drawing on a review of 219 papers, five key areas of practice were identified – technology design, building design, urban climate, systems design, and policy assessment – each with distinct and incomplete interpretations of the problem domain. We also highlight a sixth field, land use and transportation modelling, which has direct relevance to the use of energy in cities but has been somewhat overlooked by the literature to date. Despite their diversity, these approaches to urban energy system modelling share four common challenges in understanding model complexity, data quality and uncertainty, model integration, and policy relevance. We then examine the opportunities for improving current practice in urban energy systems modelling, focusing on the potential of sensitivity analysis and cloud computing, data collection and integration techniques, and the use of activity-based modelling as an integrating framework. The results indicate that there is significant potential for urban energy systems modelling to move beyond single disciplinary approaches towards a sophisticated integrated perspective that more fully captures the theoretical intricacy of urban energy systems.

/pdf/a-review-of-urban-energy-system-models-approaches-challenges-3n6p1jv426.pdf

A review of urban energy system models: Approaches, challenges and opportunities

The Darrieus wind turbine: Proposal for a new performance prediction model based on CFD

This paper presents a review on the performance of Savonius wind turbines. This type of turbine is unusual and its application for obtaining useful energy from air stream is an alternative to the use of conventional wind turbines. Simple construction, high start up and full operation moment, wind acceptance from any direction, low noise and angular velocity in operation, reducing wear on moving parts, are some advantages of using this type of machine. Over the years, numerous adaptations for this device were proposed. The variety of possible configurations of the rotor is another advantage in using such machine. Each different arrangement of Savonius rotor affects its performance. Savonius rotor performance is affected by operational conditions, geometric and air flow parameters. The range of reported values for maximum averaged power coefficient includes values around 0.05–0.30 for most settings. Performance gains of up to 50% for tip speed ratio of maximum averaged power coefficient are also reported with the use of stators. Present article aims to gather relevant information about Savonius turbines, bringing a discussion about their performance. It is intended to provide useful knowledge for future studies.

A review on the performance of Savonius wind turbines

Unsteady Aerodynamics of a Savonius wind rotor: a new computational approach for the simulation of energy performance

Enhancement of Savonius wind rotor aerodynamic performance: a computational study of new blade shapes and curtain systems

http://www.fem.unicamp.br/~phoenics/EM974/PROJETOS/PROJETOS%201%20SEM-15/TURMA%20A/GRUPO-4-Ranque-Hilsch%20tubo-vortice/Grupo2ReferenciaSecchiaroli.pdf

Valerio D’Alessandro

Papers

Unsteady Aerodynamics of a Savonius wind rotor: a new computational approach for the simulation of energy performance

Enhancement of Savonius wind rotor aerodynamic performance: a computational study of new blade shapes and curtain systems

Numerical simulation of turbulent flow in a Ranque–Hilsch vortex tube

A Spalart-Allmaras turbulence model implementation in a discontinuous Galerkin solver for incompressible flows

Detached–eddy simulations of the flow over a cylinder at Re = 3900 using OpenFOAM