TRACMASS 7.0 - A Lagrangian trajectory code for atmosphere and ocean sciences

2021 ◽  
Author(s):  
Aitor Aldama Campino ◽  
Kristofer Döös ◽  
Sara Berglund ◽  
Dipanjan Dey ◽  
Joakim Kjellsson ◽  
...  
Keyword(s):  
Mass Transport ◽  
Numerical Scheme ◽  
Vertical Coordinate ◽  
Ocean Sciences ◽  
Short Course ◽  
Water Tracing ◽  
Stream Functions ◽  
Set Up ◽  
User Friendly ◽  
Code Version

<p>The latest version of the <strong>TRACMASS</strong> trajectory code, version 7.0 will be presented. The latest version includes several new features, e.g. water tracing in the atmosphere, generalisation of the tracer handling, and improvements to the numerical scheme. The code has also become more user friendly and easier to get started with. Previous versions of <strong>TRACMASS</strong> only allowed temperature, salinity and potential density to be calculated along the trajectories, but the new version allows any tracer to be followed e.g. biogeochemical tracers or chemical compounds in the atmosphere. </p><p><strong>TRACMASS</strong> calculates Lagrangian trajectories offline for both the ocean and atmosphere by using already stored velocity fields, and optionally tracer fields. The code supports most vertical coordinate systems, e.g. z-star, z-tilde, sigma, and hybrid sigma-pressure coordinates. Hence, <strong>TRACMASS</strong> supports a range of atmosphere and ocean models such as ECMWF IFS, NEMO, ROMS, MOM, as well as reanalysis products (e.g. ERA-5) or observations (e.g. geostrophic currents from AVISO satellite altimetry). The fact that the numerical scheme in <strong>TRACMASS</strong> is mass conserving allows us to associate each trajectory with a mass transport and calculate the Lagrangian mass transport between different regions as well as construct Lagrangian stream functions. </p><p>A short course on how to set up, configure and run the <strong>TRACMASS </strong>code will be given separately, <strong>SC5.17</strong>.</p>

scholarly journals TRACMASS - A mass conserving trajectory code for ocean and atmosphere general circulation models

2020 ◽  
Author(s):  
Aitor Aldama Campino ◽  
Kristofer Döös ◽  
Sara Berglund ◽  
Dipanjan Dey ◽  
Joakim Kjellsson ◽  
...  
Keyword(s):  
Mass Transport ◽  
General Circulation ◽  
General Circulation Models ◽  
Velocity Fields ◽  
Grid Turbulence ◽  
Live Demonstration ◽  
Water Tracing ◽  
Stream Functions ◽  
Scale Turbulence ◽  
Set Up

<p>We present the latest version of the TRACMASS trajectory code, version 7.0. The new version includes new features such as water tracing in the atmosphere, parameterisation scheme for sub-grid scale turbulence, generalisation of the tracer handling, etc. The code has also become more user friendly and easier to get started with. Previous versions of TRACMASS only allowed temperature, salinity and potential density to be calculated along the trajectories, but the new version allows any tracer to be followed e.g. biogeochemical tracers or chemical compounds in the atmosphere. The new parameterisation of sub-grid turbulence will enhance the kinetic energy and dispersion of trajectories in the ocean so that results from eddy-permitting ocean models (dx ∼25km) resemble those from “eddy-resolving” models (dx ∼8km). We will demonstrate some use cases of these new capabilities for atmosphere and ocean sciences. </p><p>TRACMASS calculates Lagrangian trajectories offline for both the ocean and atmosphere by using already stored velocity fields, and optionally tracer fields. The velocity fields may be taken from ocean or atmosphere circulation models (e.g. NEMO, OpenIFS), reanalysis products (e.g. ERA-5) or observations (e.g. geostrophic currents from satellite altimetry). The fact that the numerical scheme in TRACMASS is mass conserving allows us to associate each trajectory with a mass transport and calculate the Lagrangian mass transport between different regions as well as construct Lagrangian stream functions. </p><p>A live demonstration on how to set up, configure and run the TRACMASS code will be given.</p>

High Resolution Large Eddy Simulations to Evaluate Turbulence Properties Within a Real Helicopter Engine Combustor

2018 ◽  
Author(s):  
Charlie Koupper ◽  
Jean Lamouroux ◽  
Stephane Richard ◽  
Gabriel Staffelbach
Keyword(s):  
Gas Turbine ◽  
Turbulence Intensity ◽  
Numerical Scheme ◽  
Mesh Refinement ◽  
Large Eddy Simulations ◽  
Scale Model ◽  
Large Eddy ◽  
Set Up ◽  
High Level ◽  
The Impact

In a gas turbine, the combustor is feeding the turbine with hot gases at a high level of turbulence which in turns strongly enhances the heat transfer in the turbine. It is thus of primary importance to properly characterize the turbulence properties found at the exit of a combustor to design the turbine at its real thermal constraint. This being said, real engine measurements of turbulence are extremely rare if not inexistent because of the harsh environment and difficulty to implement experimental techniques that usually operate at isothermal conditions (e.g. hot wire anemometry). As a counterpart, high fidelity unsteady numerical simulations using Large Eddy Simulations (LES) are now mature enough to simulate combustion processes and turbulence within gas turbine combustors. It is thus proposed here to assess the LES methodology to qualify turbulence within a real helicopter engine combustor operating at take-off conditions. In LES, the development of turbulence is primarily driven by the level of real viscosity in the calculation, which is the sum of three contributions: laminar (temperature linked), turbulent (generated by the sub-grid scale model) and artificial (numerics dependent). In this study, the impact of the two main sources of un-desired viscosity is investigated: the mesh refinement and numerical scheme. To do so, three grids containing 11, 33 and 220 million cells for a periodic sector of the combustor are tested as well as centred second (Lax-Wendroff) and third order (TTGC) in space schemes. The turbulence properties (intensity and integral scales) are evaluated based on highly sampled instantaneous solutions and compared between the available simulations. Results show first that the duration of the simulation is important to properly capture the level of turbulence. If short simulations (a few combustor through-times) may be sufficient to evaluate the turbulence intensity, a bias up to 14% is introduced for the turbulence length scales. In terms of calculation set-up, the mesh refinement is found to have a limited influence on the turbulence properties. The numerical scheme influence on the quantities studied here is small, highlighting that the employed schemes dissipation properties are already sufficient for turbulence characterization. Finally, spatially averaged values of turbulence intensity and lengthscale at the combustor exit are almost identically predicted in all cases. However, significant variations from hub to tip are reported, which questions the pertinence to use 0-D turbulence boundary conditions for turbines. Based on the set of simulations discussed in the paper, guidelines can be derived to adequately set-up (mesh, scheme) and run (duration, acquisition frequency) a LES when turbulence evaluation is concerned. As no experimental counterpart to this study is available, the conclusions mainly aim at knowing the possible numerical bias rather than commenting on the predictivity of the approach.

scholarly journals A Simulation Tool for Evaluating Video Streaming Architectures in Vehicular Network Scenarios

Electronics ◽  
2020 ◽  
Vol 9 (11) ◽  
pp. 1970
Author(s):  
Pedro Pablo Garrido Abenza ◽  
Manuel P. Malumbres ◽  
Pablo Piñol ◽  
Otoniel López Granado
Keyword(s):  
Video Transmission ◽  
Vehicular Networks ◽  
Experimental Tests ◽  
Video Encoding ◽  
Simulation Tool ◽  
Simulation Research ◽  
Integrated Simulation ◽  
Network Simulators ◽  
Set Up ◽  
User Friendly

An integrated simulation tool called Video Delivery Simulation Framework over Vehicular Networks (VDSF-VN) is presented. This framework is intended to allow users to conduct experiments related to video transmission in vehicular networks by means of simulation. Research on this topic requires the use of many independent tools, such as traffic and network simulators, intermediate frameworks, video encoders and decoders, converters, platform-dependent scripting languages, data visualisation packages and spreadsheets, and some other tasks are performed manually. The lack of tools necessary to carry out all these tasks in an integrated and efficient way formed the motivation for the development of the VDSF-VN framework. It is managed via two user-friendly applications, GatcomSUMO and GatcomVideo, which allow all the necessary tasks to be accomplished. The first is primarily used to build the network scenario and set up the traffic flows, whereas the second involves the delivery process of the whole video, encoding/decoding video, running simulations, and processing all the experimental results to automatically provide the requested figures, tables and reports. This multiplatform framework is intended to fill the existing gap in this field, and has been successfully used in several experimental tests of vehicular networks.

scholarly journals MESPEUS: a database of the geometry of metal sites in proteins

2008 ◽  
Vol 41 (5) ◽  
pp. 963-968 ◽  
Author(s):  
K. Hsin ◽  
Y. Sheng ◽  
M. M. Harding ◽  
P. Taylor ◽  
M. D. Walkinshaw
Keyword(s):  
Protein Molecule ◽  
Data Bank ◽  
Web Interface ◽  
Coordination Numbers ◽  
Data Resolution ◽  
Metal Metal ◽  
Set Up ◽  
Stored Information ◽  
Interacting Atoms ◽  
User Friendly

A database with details of the geometry of metal sites in proteins has been set up. The data are derived from metalloprotein structures that are in the Protein Data Bank [PDB; Berman, Henrick, Nakamura & Markley (2006).Nucleic Acids Res.35, D301–D303] and have been determined at 2.5 Å resolution or better. The database contains all contacts within the crystal asymmetric unit considered to be chemical bonds to any of the metals Na, Mg, K, Ca, Mn, Fe, Co, Ni, Cu or Zn. The stored information includes PDB code, crystal data, resolution of structure determination, refinement program andRfactor, protein class (from PDB header), contact distances, atom names of metal and interacting atoms as they appear in the PDB, site occupancies,Bvalues, coordination numbers, information on coordination shapes, and metal–metal distances. This may be accessed by SQL queries, or by a user-friendly web interface which searches for contacts between specified types of atoms [for example Ca and carboxylate O of aspartate, Co and imidazole Nδ of histidine] or which delivers details of all the metal sites in a specified protein. The web interface allows graphical display of the metal site, on its own or within the whole protein molecule, and may be accessed at http://eduliss.bch.ed.ac.uk/MESPEUS/. Some applications are briefly described, including a study of the characteristics of Mg sites that bind adenosine triphosphate, the derivation of an average Mg—Ophosphatedistance and some problems that arise when average bond distances with high precision are required.

An investigation into critical service determinants of customer to business (C2B) type product returns in retail firms

2016 ◽  
Vol 46 (6/7) ◽  
pp. 606-633 ◽  
Author(s):  
Kamrul Ahsan ◽  
Shams Rahman
Keyword(s):  
Support Service ◽  
Product Returns ◽  
Senior Managers ◽  
Analytic Hierarchy ◽  
Content Type ◽  
Customer Support ◽  
Reference Guide ◽  
Set Up ◽  
Returns Management ◽  
User Friendly

Purpose – In spite of regular occurrence of product returns, research into determinants of returns services in retail businesses is still limited. To fill the gap, the purpose of this paper is to investigate critical determinants of customer to business type product returns services in the retail industry. Design/methodology/approach – The authors develop a framework of product returns services that consists of three major service categories and 16 returns service determinants. The criticality of the determinants of product returns management are assessed employing the analytic hierarchy process (AHP) based multi-criteria decision-making approach. Under AHP set up the authors interview retail operations managers of major retail firms in Australia to identify critical determinants of product returns services. Findings – Results indicate that the most important returns services dimensions are the way in which returns services are handled through interaction, and the outcome of service delivery. The top five critical service determinants of product returns are related to: communication support service for customer, money back for any type of returns, customer support access, user-friendly interaction, and product replacement. Originality/value – The findings of the study can be considered by senior managers of retail firms as a reference guide for designing efficient and effective returns service systems and developing strategies for competitive advantage through product returns, namely, customer retention.

REF‐11: A database for references

Online Review ◽  
1986 ◽  
Vol 10 (3) ◽  
pp. 163-164 ◽  
Author(s):  
Maria Faraone
Keyword(s):  
Reference Data ◽  
Set Up ◽  
User Friendly

If you find yourself drowning in reference data, unable to organize information to your satisfaction, REF‐11 may be the package to help you. With REF‐11, users can set up a file of bibliographic references, and search the file. It is quite user friendly. An optional utility ($30) produces bibliographies from the files. A second utility ($25) stores text material in REF‐11 files.

scholarly journals Developing a Coupling Model System of Global Rainfall Data and Open-Source Model for Water Forecast in Poorly Gauged Basins

2019 ◽  
Vol 3 (1) ◽  
pp. 355 ◽  
Author(s):  
Duong Du Bui ◽  
Duc Minh Tran ◽  
Huong Thi Vu ◽  
Nuong Thi Bui
Keyword(s):  
Open Source ◽  
Input Data ◽  
Water Security ◽  
Coupling Model ◽  
Source Model ◽  
Rainfall Data ◽  
Creative Commons ◽  
Set Up ◽  
User Friendly

Water security is under severe pressures from human interventions and climate change in all over the world and improved water forecast is essential for water management. HYPE is a semi-distributed hydrographic model, running on Windows or Linux operating systems. The code of the model is written by the Fortran programming language and open source as Lesser GNU Public License. HYPE has been becoming a widely used tool in the forecasting of transboundary flows. However, the application of HYPE encounters many difficulties in processing input data and serving the construction, calibration, and validation of the model. This article introduces the development of the V-HYPE tool that helps a couple of global rainfall data and HYPE model for operational use. V-HYPE allows developing a user-friendly interface and setting parameters of the HYPE model as well as evaluating errors and transforming and visually displaying the results of the model. Besides, the V-HYPE has the ability to show related maps (i.e. sub-basins, river network, lake, and dams, etc), set up input data, automatically download global rainfall data, and visually display results on WebGIS. V-HYPE also can generate bulletins supporting for operational water resources warning and forecasting works in Vietnam. The utilities of this tool are demonstrated in the case study of Serepok river basin.This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium provided the original work is properly cited.

scholarly journals ProsNet – a Modelica library for prosumer-based heat networks: description and validation

2021 ◽  
Vol 2042 (1) ◽  
pp. 012031
Author(s):  
I Elizarov ◽  
T Licklederer
Keyword(s):  
Steady State ◽  
Heat Generation ◽  
Renewable Energy Sources ◽  
District Heating ◽  
Heating Systems ◽  
Heat Networks ◽  
Operating Modes ◽  
Set Up ◽  
User Friendly ◽  
Steady State Performance

Abstract Prosumer-based heat networks are a new concept in district heating systems that uses the ability of prosumers to operate as either producers or consumers. This type of networks allows for utilizing distributed heat generation and renewable energy sources. A broad range of individual operating modes, heat generation technologies, and topologies determine complex thermo-hydraulic behavior of such networks. Simulations help gain insights into their properties. In this paper, a Modelica library ProsNet is presented for such simulations. It is designed to set up models of prosumer-based heat networks to investigate their dynamic and steady-state performance in a user-friendly way. Important models of the library are described in more detail. Finally, a successful validation of the developed components was performed by comparing simulation results with another software for modeling bidirectional heat networks in steady-state.

scholarly journals Generation of Cobalt-Containing Nanoparticles on Carbon via Pyrolysis of a Cobalt Corrole and Its Application in the Hydrogenation of Nitroarenes

Catalysts ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 11
Author(s):  
Jessica Michalke ◽  
Michael Haas ◽  
Dominik Krisch ◽  
Thomas Bögl ◽  
Stephan Bartling ◽  
...  
Keyword(s):  
State Of The Art ◽  
Active Material ◽  
Metal Catalyst ◽  
Noble Metal Catalyst ◽  
Wet Impregnation ◽  
Laboratory Bench ◽  
Gas Atmosphere ◽  
Set Up ◽  
Heterogeneous Hydrogenation ◽  
User Friendly

We report on the manufacture of a state-of-the-art heterogeneous non-noble metal catalyst, which is based on a molecularly well-defined phosphine-tagged cobalt corrole complex. This precursor compound is readily synthesized from convenient starting materials while the active material is obtained through wet-impregnation of the pertinent metalliferous macrocycle onto carbon black followed by controlled pyrolysis of the loaded carrier material under an inert gas atmosphere. Thus, the obtained composite was then applied in the heterogeneous hydrogenation of various nitroarenes to yield a vast array of valuable aniline derivatives that were conveniently isolated as their hydrochloride salts. The introduced catalytic protocol is robust and user-friendly with the entire assembly of the reaction set-up enabling the conduction of the experiments on the laboratory bench without any protection from air.

scholarly journals Random Assignment with a Smile: How to Love “TheRandomiser”

2020 ◽  
Vol 4 (3-4) ◽  
pp. 233-237
Author(s):  
Benedict Linton ◽  
Barak Ariel
Keyword(s):  
Random Assignment ◽  
Access To Treatment ◽  
Text Format ◽  
Plain Text ◽  
Treatment Providers ◽  
Online Portal ◽  
Police Agencies ◽  
Set Up ◽  
Randomised Controlled ◽  
User Friendly

Abstract Objectives This note describes a free online portal (www.therandomiser.co.uk) that allows researchers to design randomised controlled trials and then delegate the random assignment process to pracademics delivering the experiment. Methods Observation of the use of this tool in repeated randomised trials in police agencies. Findings Researchers are able to design RCTs using the online portal, which offers many ways to customise the experimental design. Results are downloadable in excel or plain text format. Researchers can grant access to treatment providers, enabling them to log in securely, enter identifiers for cases, and assign different treatments to each case. Email notifications of assignment can be sent to designated list of recipients who can track the allocation of treatments. This tool delivers this functionality at zero cost and at the time of writing is being used by 78 researchers, who have set up 70 experiments that have processed 5778 randomisations. Conclusions TheRandomiser has been used in multiple experiments with feedback suggesting it is a powerful and user-friendly tool. The ability to deliver trickle-flow randomisation with high degrees of researcher control are attractive, as is the ability to edit an unlimited number of qualification questions prior to randomisation.

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