scholarly journals STH-CFD Codes Coupled Calculations Applied to HLM Loop and Pool Systems

2017 ◽  
Vol 2017 ◽  
pp. 1-13 ◽  
Author(s):  
M. Angelucci ◽  
D. Martelli ◽  
G. Barone ◽  
I. Di Piazza ◽  
N. Forgione
Keyword(s):  
Numerical Scheme ◽  
Research Centre ◽  
Ansys Fluent ◽  
Reading And Writing ◽  
Coupled Calculation ◽  
Coupling Procedure ◽  
Pool System ◽  
Time Required ◽  
The University ◽  
Good Agreement

This work describes the coupling methodology between a modified version of RELAP5/Mod3.3 and ANSYS Fluent CFD code developed at the University of Pisa. The described coupling procedure can be classified as “two-way,” nonoverlapping, “online” coupling. In this work, a semi-implicit numerical scheme has been implemented, giving greater stability to the simulations. A MATLAB script manages both the codes, oversees the reading and writing of the boundary conditions at the interfaces, and handles the exchange of data. A new tool was used to control the Fluent session, allowing a reduction of the time required for the exchange of data. The coupling tool was used to simulate a loop system (NACIE facility) and a pool system (CIRCE facility), both working with Lead Bismuth Eutectic and located at ENEA Brasimone Research Centre. Some modifications in the coupling procedure turned out to be necessary to apply the methodology in the pool system. In this paper, the comparison between the obtained coupled numerical results and the experimental data is presented. The good agreement between experiments and calculations evinces the capability of the coupled calculation to model correctly the involved phenomena.

scholarly journals STH/CFD Coupled Simulation of the Protected Loss of Flow Accident in the CIRCE-HERO Facility

2020 ◽  
Vol 10 (20) ◽  
pp. 7032 ◽  
Author(s):  
Pucciarelli Andrea ◽  
Galleni Francesco ◽  
Moscardini Marigrazia ◽  
Martelli Daniele ◽  
Forgione Nicola
Keyword(s):  
Thermal Stratification ◽  
Outlet Section ◽  
Experimental Conditions ◽  
Ansys Fluent ◽  
Internal Loop ◽  
Fuel Pin ◽  
Mass Flow Rates ◽  
Computational Fluid Dynamics Cfd ◽  
The University ◽  
Good Agreement

The paper presents the application of a coupling methodology between Computational Fluid Dynamics (CFD) and System Thermal Hydraulic (STH) codes developed at the University of Pisa. The methodology was applied to the CIRCE-HERO facility in order to reproduce the recently performed experimental conditions simulating a Protected Loss Of Flow Accident (PLOFA). The facility consists of an internal loop, equipped with a fuel pin simulator and a steam generator, and an external pool. In this coupling application, the System code RELAP5 is adopted for the simulation of the internal loop while the CFD code ANSYS Fluent is used for the sake of simulating the pool. The connection between the two addressed domains is provided at the inlet and outlet section of the internal loop; a thermal coupling is also performed in order to reproduce the observed thermal stratification phenomenon. The obtained results are promising and a good agreement was obtained for both the mass flow rates and temperature measurements. Capabilities and limitations of the adopted coupling technique are discussed in the present paper also providing suggestions for improvements and developments to be achieved in the frame of future applications.

Thermal Performance Analysis of a Rectangular Longitudinal Finned Solar Air Heater With Semicircular Absorber Plate

2015 ◽  
Vol 138 (1) ◽  
Author(s):  
Satyender Singh ◽  
Prashant Dhiman
Keyword(s):  
Thermal Performance ◽  
Numerical Solutions ◽  
Solar Air Heater ◽  
Duct Flow ◽  
Balance Equations ◽  
Absorber Plate ◽  
Ansys Fluent ◽  
Air Heater ◽  
Glass Cover ◽  
Good Agreement

Thermal performance of a single-pass single-glass cover solar air heater consisting of semicircular absorber plate finned with rectangular longitudinal fins is investigated. The analysis is carried out for different hydraulic diameters, which were obtained by varying the diameter of the duct from 0.3–0.5 m. One to five numbers of fins are considered. Reynolds number ranges from 1600–4300. Analytical solutions for energy balance equations of different elements and duct flow of the solar air heater are presented; results are compared with finite-volume methodology based numerical solutions obtained from ansys fluent commercial software, and a fairly good agreement is achieved. Moreover, analysis is extended to check the effect of double-glass cover and the recycle of the exiting air. Results revealed that the use of double-glass cover and recycle operation improves the thermal performance of solar air heater.

scholarly journals Experimental Methods for Measuring the Viscous Friction Coefficient in Hydraulic Spool Valves

2021 ◽  
Vol 13 (13) ◽  
pp. 7174
Author(s):  
Massimo Rundo ◽  
Paolo Casoli ◽  
Antonio Lettini
Keyword(s):  
Friction Coefficient ◽  
Viscous Friction ◽  
Experimental Tests ◽  
Experimental Methods ◽  
Displacement Transducer ◽  
A Posteriori ◽  
Displacement Control ◽  
Spool Valves ◽  
The University ◽  
Good Agreement

In hydraulic components, nonlinearities are responsible for critical behaviors that make it difficult to realize a reliable mathematical model for numerical simulation. With particular reference to hydraulic spool valves, the viscous friction coefficient between the sliding and the fixed body is an unknown parameter that is normally set a posteriori in order to obtain a good agreement with the experimental data. In this paper, two different methodologies to characterize experimentally the viscous friction coefficient in a hydraulic component with spool are presented. The two approaches are significantly different and are both based on experimental tests; they were developed in two distinct laboratories in different periods of time and applied to the same flow compensator of a pump displacement control. One of the procedures was carried out at the Fluid Power Research Laboratory of the Politecnico di Torino, while the other approach was developed at the University of Parma. Both the proposed methods reached similar outcomes; moreover, neither method requires the installation of a spool displacement transducer that can significantly affect the results.

scholarly journals Interview with Stuart Walker

2017 ◽  
Vol 24 (43) ◽  
pp. 12
Author(s):  
Marilia Riul ◽  
Ingrid Moura Wanderley ◽  
Maria Cecilia Loschiavo dos Santos
Keyword(s):  
Product Design ◽  
Solid Waste ◽  
Mass Production ◽  
Social System ◽  
Design Research ◽  
National Policy ◽  
Human Values ◽  
Research Centre ◽  
Design For Sustainability ◽  
The University

Stuart Walker is Professor of Design for Sustainability and Co-Director of the Imagination Lancaster design research Centre at Lancaster University. Focused on design for sustainability; product aesthetics and meaning; practice-based design research and product design that explores and expresses both human values and notions of spirituality. He was interviewed in his second visit to Brazil to attend the Conference and Workshop "Design and the national policy of solid waste: dialogues on sustainability," held in the Sustainability Laboratory (Lassu) at the University of São Paulo (USP) in 2013, an activity of the research project sponsored by CNPq: Product design, sustainability and national policy on solid waste, coordinated by Professor Maria Cecilia Loschiavo dos Santos. Through the suggested questions, Professor Stuart Walker built a severe critique of our social system of mass production and reminded us that values really matter to our journey.

The Reduction of Bias Error in Transfer Function Estimates Using FFT-Based Analyzers

1984 ◽  
Vol 106 (1) ◽  
pp. 29-35 ◽  
Author(s):  
P. Cawley
Keyword(s):  
Transfer Function ◽  
Random Excitation ◽  
Analogue Computer ◽  
Bias Error ◽  
Testing Time ◽  
Theoretical Predictions ◽  
Set Up ◽  
Modal Mass ◽  
Time Required ◽  
Good Agreement

The susceptibility to bias error of two methods for computing transfer (frequency response) functions from spectra produced by FFT-based analyzers using random excitation has been investigated. Results from tests with an FFT analyzer on a single degree-of-freedom system set up on an analogue computer show good agreement with the theoretical predictions. It has been shown that, around resonance, the bias error in the transfer function estimate H2 (Syy/Sxy*) is considerably less than that in the more commonly used estimate, H1 (Sxy/Sxx). The record length, and hence the testing time, required for a given accuracy is reduced by over 50 percent if the H2 calculation procedure is used. The analysis has also shown that if shaker excitation is used on lightly damped structures with low modal mass, it is important to minimize the mass of the force gage and the moving element of the shaker.

The effects of the World Wide Web on reading and writing skills in a Spanish cultural studies courseLos efectos de la Web en la adquisición de destrezas lectoras y escritas en un curso de cultura hispana

ReCALL ◽  
2000 ◽  
Vol 12 (1) ◽  
pp. 63-72 ◽  
Author(s):  
CARMEN CABOT
Keyword(s):  
Writing Skills ◽  
Written Language ◽  
Web Based ◽  
Reading And Writing ◽  
Spanish Speaking ◽  
South Wales ◽  
Effective Use ◽  
The University ◽  
Task Oriented ◽  
Target Culture

This paper presents the results of a study that demonstrates an effective use of the Web as a tool to increase motivation and thus promote reading and writing skills in Spanish as well as a deeper sense of the culture of the Spanish speaking world. In the study, thirty students of second year Spanish at the University of New South Wales were required to prepare an itinerary for a trip to a Spanish speaking country of their choice using the WWW as the only resource. In general our findings regarding improved language skills were consistent with the literature: an increase of vocabulary, more use of references, more student initiated interactions and greater interactivity in the classroom amongst students were observed. There was, however, one aspect, linguistic accuracy, in which improvement was not greatly noted. The data collected confirms that a task-oriented Web based course can increase the motivation of students, improve the scope of their reading, and enhance their perception of the target culture, all with a great effect on range of language explored, learned and re-processed, but a much lesser effect on the accuracy of written language produced.

The Brazilian AMS Radiocarbon Laboratory (LAC-UFF) and the Intercomparison of Results with CENA and UGAMS

Radiocarbon ◽  
2013 ◽  
Vol 55 (2) ◽  
pp. 325-330 ◽  
Author(s):  
K D Macario ◽  
P R S Gomes ◽  
R M Anjos ◽  
C Carvalho ◽  
R Linares ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Latin America ◽  
Liquid Scintillation Counting ◽  
Nuclear Energy ◽  
Liquid Scintillation ◽  
Scintillation Counting ◽  
Physics Institute ◽  
University Of Georgia ◽  
The University ◽  
Good Agreement

After 22 yr of the low-level liquid scintillation counting 14C laboratory at the Center for Nuclear Energy in Agriculture (CENA) at São Paulo University (USP), Piracicaba, Brazil, and several collaborative projects with Brazilian and international researchers from distinct scientific areas, the first 14C accelerator mass spectrometry (AMS) laboratory in Latin America was installed at the Physics Institute of the Universidade Federal Fluminense (UFF), Niterói, Brazil. A 250kV single stage accelerator produced by National Electrostatics Corporation began its operation in 2012. In this work, we compare measurements performed at the AMS Radiocarbon Laboratory at UFF (LAC-UFF) with those performed at CENA and the University of Georgia (UGAMS), Georgia, USA. All the results obtained from distinct inorganic and organic samples were in very good agreement.

ADHD, Self-Harm, and the Importance of Early Childhood Intervention - In Conversation with Dr. Melissa Mulraney

2021 ◽  
Keyword(s):  
Child Mental Health ◽  
Associate Editor ◽  
Mental Health Research ◽  
Social Neuroscience ◽  
Early Childhood Intervention ◽  
Research Centre ◽  
Senior Lecturer ◽  
Childhood Intervention ◽  
Self Harm ◽  
The University

In this podcast, we talk to Dr. Melissa Mulraney, Senior Lecturer and co-leader of the Child Mental Health Research Centre at the Institute for Social Neuroscience in Melbourne, Australia, Honorary Research Fellow at the Murdoch Children's Research Institute in the Department of Paediatrics at the University of Melbourne, and Associate Editor of CAMH.

scholarly journals The Radiopharmaceuticals Production and Research Centre established by the Heavy Ion Laboratory of the University of Warsaw

2014 ◽  
Vol 66 ◽  
pp. 10003 ◽  
Author(s):  
J. Choiński ◽  
J. Jastrzębskia ◽  
K. Kilian ◽  
I. Mazur ◽  
P.J. Napiorkowski ◽  
...  
Keyword(s):  
Heavy Ion ◽  
Research Centre ◽  
The University
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