Fluid dynamic modelling of electric arcs for industrial applications

1998 ◽  
Vol 70 (6) ◽  
pp. 1163-1168 ◽  
Author(s):  
C. Delalondre ◽  
Alain Bouvier ◽  
Ange Caruso ◽  
Namane Méchitoua ◽  
O. Simonin ◽  
...  
Keyword(s):  
Fluid Dynamic ◽  
Dynamic Modelling ◽  
Industrial Applications ◽  
Electric Arcs

Non-invasive temperature measurement of turbulent flows of aqueous solutions and gases in pipes

2020 ◽  
Vol 87 (9) ◽  
pp. 553-563
Author(s):  
Jörg Gebhardt ◽  
Guruprasad Sosale ◽  
Subhashish Dasgupta
Keyword(s):  
Surface Temperature ◽  
Temperature Measurement ◽  
Turbulent Flows ◽  
Fluid Dynamic ◽  
Industrial Applications ◽  
Static Case ◽  
Pipe Surface ◽  
Non Invasive ◽  
Step Model ◽  
Plant Optimization

AbstractAccurate and responsive non-invasive temperature measurements are enablers for process monitoring and plant optimization use cases in the context of Industry 4.0. If their performance is proven for large classes of applications, such measurement principles can replace traditional invasive measurements. In this paper we describe a two-step model to estimate the process temperature from a pipe surface temperature measurement. This static case model is compared to and enhanced by computational fluid dynamic (CFD) calculations to predict transient situations. The predictions of the approach are validated by means of controlled experiments in a laboratory environment. The experimental results demonstrate the efficacy of the model, the responsiveness of the pipe surface temperature, and that state of the art industrial non-invasive sensors can achieve the performance of invasive thermowells. The non-invasive sensors are then used to demonstrate the performance of the model in industrial applications for cooling fluids and steam.

Blade Fault Recognition Based on Signal Processing and Adaptive Fluid Dynamic Modelling

1997 ◽  
Author(s):  
A. Stamatis ◽  
N. Aretakis ◽  
K. Mathioudakis
Keyword(s):  
Flow Field ◽  
Fluid Dynamic ◽  
Measurement Data ◽  
Dynamic Modelling ◽  
Physical Modelling ◽  
Diagnostic Procedures ◽  
Measured Quantity ◽  
Test Cases ◽  
Actual Measurement ◽  
Fault Recognition

An approach for identification of faults in blades of a gas turbine, based on physical modelling is presented. A measured quantity is used as an input and the deformed blading configuration is produced as an output. This is achieved without using any kind of “signature”, as is customary in diagnostic procedures for this kind of faults. A fluid dynamic model is used in a manner similar to what is known as “inverse design methods”: the solid boundaries which produce a certain flow field are calculated by prescribing this flow field. In the present case a signal, corresponding to the pressure variation on the blade-to-blade plane, is measured. The blade cascade geometry that has produced this signal is then produced by the method. In the paper the method is described and applications to test cases are presented. The test cases include theoretically produced faults as well as experimental cases, where actual measurement data are shown to produce the geometrical deformations which existed in the test engine.

scholarly journals Computational Fluid Dynamic Modelling of Thermal Periodic Stabilized Regime in Passive Buildings

2016 ◽  
Vol 8 (11) ◽  
pp. 1172 ◽  
Author(s):  
Fabio Nardecchia ◽  
Benedetta Mattoni ◽  
Francesca Pagliaro ◽  
Lucia Cellucci ◽  
Fabio Bisegna ◽  
...  
Keyword(s):  
Computational Fluid Dynamic ◽  
Fluid Dynamic ◽  
Dynamic Modelling

Novel CMR techniques for advanced surgical planning

2018 ◽  
pp. 502-508
Author(s):  
Mark A Fogel
Keyword(s):  
Magnetic Resonance ◽  
Fluid Dynamic ◽  
Three Dimensional ◽  
Dynamic Modelling ◽  
Surgical Care ◽  
Velocity Mapping ◽  
Three Dimensional Printing ◽  
Improved Outcomes ◽  
Medical Advances ◽  
Dimensional Printing

Medical and surgical care for the patient with congenital heart disease (CHD) has advanced greatly over the past 40 years; along with improved surgical and catheter-based techniques, intensive unit care, and overall medical advances, improved outcomes have accrued across a whole host of cardiac defects. This is owed, in no small part, to advances in imaging and cardiovascular magnetic resonance (CMR) which has played an important and growing role in this evolution. Novel CMR techniques 25 years ago, such as gadolinium-based imaging and two-dimensional velocity mapping, are now commonplace. At the cutting edge of novel CMR techniques, in the current era, are computational fluid dynamic modelling, three-dimensional printing, four-dimensional flow imaging, and X-ray magnetic resonance/interventional CMR, which will be the focus of this chapter. The hope is that one day these techniques will be the commonplace ones, aiding in the care of a broad spectrum of CHD.

scholarly journals Computational fluid dynamic modelling of NOx formation in diesel engine

2020 ◽  
Vol 788 ◽  
pp. 012067
Author(s):  
S S Hoseini ◽  
G Najafi ◽  
B Ghobadian ◽  
H Azimi-Nejadian ◽  
Hossein Ahmadian
Keyword(s):  
Diesel Engine ◽  
Computational Fluid Dynamic ◽  
Fluid Dynamic ◽  
Dynamic Modelling ◽  
Nox Formation

Computational Fluid Dynamic Modelling of High Aspect Ratio Cross-Sectional Jets I: The Effect of Orifice Shape on Jet Behaviour

2003 ◽  
Author(s):  
Sarah J. Wakes
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Cfd Simulation ◽  
Fluid Dynamic ◽  
Dynamic Modelling ◽  
Common Belief ◽  
Cross Sectional ◽  
Numerical Work ◽  
Hydrocarbon Production ◽  
Gas Dispersion

High aspect ratio cross-sectional jets (HAR jets) are significant for many industrial applications including offshore hydrocarbon production safety, manufacturing processes, aeronautics and others. Little interest has been paid to such jets as the common belief was that within an acceptable distance from the jet orifice the behaviour emulates that of an axisymmetric jet. Previous experimental and preliminary numerical work [1–4] has shown that this is not necessarily correct. Work has been done to investigate numerically the effect the orifice shape has on the behaviour of the jets. This will be in terms of the curvature of the orifice in comparison to the same aspect ratio with a straight rectangular shape. Simulations have been carried out relating to experimental work [1] as comparison and verification. The spreading of the jet will be assessed as it can have significance in terms of safety, performance and effectiveness. This work enhances previous work [3] and allows an assessment of whether such a curvature in the inlet significantly effects the jet behaviour for two pipe pressures. The choice of turbulence model will also be assessed in terms of the standard two-equation k-ε model and it’s variants the RNG and Realisable models. Later work will investigate the use of Large Eddy Simulation within the context of the geometry used here. This important information will allow for greater understanding for the modelling of such jets in a CFD simulation within a complex industrial problem such as gas dispersion with a hydrocarbon production area. It is realized that the fluid does not emerge as a single velocity from the pipe into the flange and hence to form the inlet for the jet. Therefore the effect of the flow within the pipe and how this effects the emerging jet behaviour is investigated in part II of this paper [5].

Real Gas Effects in Turbomachinery Flows: A Computational Fluid Dynamics Model for Fast Computations

2004 ◽  
Vol 126 (2) ◽  
pp. 268-276 ◽  
Author(s):  
Paolo Boncinelli ◽  
Filippo Rubechini ◽  
Andrea Arnone ◽  
Massimiliano Cecconi ◽  
Carlo Cortese
Keyword(s):  
Fluid Dynamic ◽  
Computational Cost ◽  
Three Dimensional ◽  
Industrial Applications ◽  
Design Tool ◽  
Navier Stokes ◽  
Computational Time ◽  
Real Gas ◽  
Real Gas Effects ◽  
Low Computational Cost

A numerical model was included in a three-dimensional viscous solver to account for real gas effects in the compressible Reynolds averaged Navier-Stokes (RANS) equations. The behavior of real gases is reproduced by using gas property tables. The method consists of a local fitting of gas data to provide the thermodynamic property required by the solver in each solution step. This approach presents several characteristics which make it attractive as a design tool for industrial applications. First of all, the implementation of the method in the solver is simple and straightforward, since it does not require relevant changes in the solver structure. Moreover, it is based on a low-computational-cost algorithm, which prevents a considerable increase in the overall computational time. Finally, the approach is completely general, since it allows one to handle any type of gas, gas mixture or steam over a wide operative range. In this work a detailed description of the model is provided. In addition, some examples are presented in which the model is applied to the thermo-fluid-dynamic analysis of industrial turbomachines.

Geothermal resources characterization of two areas in southern Tuscany

2020 ◽  
Author(s):  
Eugenio Trumpy ◽  
Gianluca Gola ◽  
Alessandro Santilano ◽  
Adele Manzella ◽  
Matteo Brambilla ◽  
...  
Keyword(s):  
Dynamic Models ◽  
Fluid Dynamic ◽  
Dynamic Modelling ◽  
Geothermal Field ◽  
Joint Analysis ◽  
Geothermal Resources ◽  
Flow Measurements ◽  
North East ◽  
Geothermal Potential ◽  
Technical Potential

<p>Based on a joint analysis of geothermal indicators (e.g. temperature map at different depth, surface heat flux) and practical features (e.g. restricted areas, existing research lease), two promising areas in southern Tuscany were identified to perform a more detailed geothermal resource characterization. An area is located on the north-east of the Larderello-Travale geothermal field, and the other one is located on the west of the Mt. Amiata geothermal field.</p><p>A quantitative geothermal resources assessment was performed in the aforementioned areas of Tuscany by solving numerical thermo-fluid dynamic models and by computing the geothermal potential using the ‘ThermoGIS’ software, as further developed for the Italian case (Trumpy et al., 2016).</p><p>First of all, geological and geophysical data required for geological and thermo-fluid dynamic modelling were collected and organised. The geological data were used to build a 3D geological model of the two areas of interest suitable for numerical simulations. Static temperature data gathered from the Italian National Geothermal Database together with site-specific heat flow measurements were used to calibrate the simulated steady state temperature distribution.</p><p>The geothermal potential computed by integrating geological, thermal and petro-physical information implementing the volume method used in ThermoGIS provided estimates of the heat in place and the geothermal technical potential maps. The resulting technical potential in the area close to Larderello –Travale is 330 MW<sub>e</sub> and in the Mt. Amiata sector is 50MW<sub>e</sub>.</p><p>References</p><p>Trumpy E., Botteghi S., Caiozzi F., Donato A., Gola G., Montanari D., Pluymaekers M., Santilano A., Van Wees, J.D., Manzella A. Geothermal potential assessment for a low carbon strategy: a new systematic approach applied in southern Italy. Energy 103, 167-181, 2016.</p>

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