2005Conférence ER5 Auteurs : Jarkass, Chadi; Antczak, Emmanuel; Chauchois, Alexis; Defer, Didier; Duthoit, Bruno Characterization of a soil by thermal impedance, application to the in situ monitoring of the soil moisture 7ème Colloque International Franco-Quebecois « Thermique des Systèmes à Température Modérée », Saint Malo (France), 2005, (ACTI). @conference{Jark2005b,
title = {Characterization of a soil by thermal impedance, application to the in situ monitoring of the soil moisture},
author = {Chadi Jarkass and Emmanuel Antczak and Alexis Chauchois and Didier Defer and Bruno Duthoit},
year = {2005},
date = {2005-01-01},
booktitle = {7ème Colloque International Franco-Quebecois « Thermique des Systèmes à Température Modérée »},
address = {Saint Malo (France)},
note = {ACTI},
keywords = {ER5},
pubstate = {published},
tppubtype = {conference}
}
|
2005Article de journal ER5 Auteurs : Carlier, E; Khattabi, Jamal El Proposal for a probabilistic model of dispersion: A first validation Dans: Mathematical and Computer Modelling, vol. 42, no. 9-10, p. 1137–1144, 2005, (ACL). Résumé | Liens @article{,
title = {Proposal for a probabilistic model of dispersion: A first validation},
author = {E Carlier and Jamal El Khattabi},
doi = {10.1016/j.mcm.2004.05.014},
year = {2005},
date = {2005-01-01},
journal = {Mathematical and Computer Modelling},
volume = {42},
number = {9-10},
pages = {1137--1144},
abstract = {The probabilistic approach is used to simulate the particle tracking for two types of porous media. The first one is sand grains with a single intergranular porosity. The particle tracking is carried out by advection and dispersion. The second one is chalk granulates with intergranular and matrix porosities. Sorption can occur with advection and dispersion during particle tracking. The particle tracking is simulated as the sum of elementary steps with independent random variables in the sand medium. An exponential distribution is obtained for each elementary step and shows that the whole process is Markovian. A gamma distribution or probability density function is then deduced. The relationship between dispersivity and the elementary step is given using the central limit theorem. The particle tracking in the chalky medium is a non-Markovian process. The probability density function depends of a power to the distance. Experimental simulation by dye tracer tests on a column have been performed for different distances and discharges. The probabilistic approach computations are in good agreement with the experimental data. The probabilistic computation seems an interesting and complementary approach to simulate transfer phenomena in porous media with respect to the traditional numerical methods. (c) 2005 Elsevier Ltd. All rights reserved.},
note = {ACL},
keywords = {ER5},
pubstate = {published},
tppubtype = {article}
}
The probabilistic approach is used to simulate the particle tracking for two types of porous media. The first one is sand grains with a single intergranular porosity. The particle tracking is carried out by advection and dispersion. The second one is chalk granulates with intergranular and matrix porosities. Sorption can occur with advection and dispersion during particle tracking. The particle tracking is simulated as the sum of elementary steps with independent random variables in the sand medium. An exponential distribution is obtained for each elementary step and shows that the whole process is Markovian. A gamma distribution or probability density function is then deduced. The relationship between dispersivity and the elementary step is given using the central limit theorem. The particle tracking in the chalky medium is a non-Markovian process. The probability density function depends of a power to the distance. Experimental simulation by dye tracer tests on a column have been performed for different distances and discharges. The probabilistic approach computations are in good agreement with the experimental data. The probabilistic computation seems an interesting and complementary approach to simulate transfer phenomena in porous media with respect to the traditional numerical methods. (c) 2005 Elsevier Ltd. All rights reserved. |
2004Article de journal ER5 Auteurs : Naji, Hassane; Mompean, Gilmar; El-Yahyaoui, Omar Evaluation of explicit algebraic stress models using direct numerical simulations Dans: Journal of Turbulence, vol. 5, p. N38, 2004, (ACL). Résumé | Liens @article{doi:10.1088/1468-5248/5/1/038,
title = {Evaluation of explicit algebraic stress models using direct numerical simulations},
author = {Hassane Naji and Gilmar Mompean and Omar El-Yahyaoui},
url = {https://www.tandfonline.com/doi/abs/10.1088/1468-5248/5/1/038},
doi = {10.1088/1468-5248/5/1/038},
year = {2004},
date = {2004-01-01},
journal = {Journal of Turbulence},
volume = {5},
pages = {N38},
publisher = {Taylor & Francis},
abstract = {The paper deals with evaluation and improvement of two recent explicit algebraic turbulent stress models (EASMs). The first model was derived by Gatski and Rumsey (2001 Closure Strategies for Turbulent and Transitional Flows ed B E Launder and N D Sandham (Cambridge: Cambridge University Press) pp 9–46) and the second is the one devised by Wallin and Johansson (2000 J. Fluid Mech. 403 89–132). These models are studied for the turbulent flow through a square duct which involves a secondary flow and significant anisotropy between the turbulent Reynolds stress tensor components. An a priori evaluation of these models is made using direct numerical simulation (DNS) results of Navier–Stokes equations. In order to handle wall proximity effects, a damping function is suggested. The material frame-indifference (MFI) of these models is studied using the eigenvectors of the rate-of-deformation tensor and their angular velocities. This procedure allows us to evaluate an objective vorticity tensor. For this flow, it is shown that the weak-equilibrium assumption used in the derivation of EASMs is verified, i.e. the material derivative of the anisotropy tensor b is negligeable (Db/Dt ≈ 0). Comparisons of results from EASM and from DNS shows that these models are able to predict reasonably well such flows.},
note = {ACL},
keywords = {ER5},
pubstate = {published},
tppubtype = {article}
}
The paper deals with evaluation and improvement of two recent explicit algebraic turbulent stress models (EASMs). The first model was derived by Gatski and Rumsey (2001 Closure Strategies for Turbulent and Transitional Flows ed B E Launder and N D Sandham (Cambridge: Cambridge University Press) pp 9–46) and the second is the one devised by Wallin and Johansson (2000 J. Fluid Mech. 403 89–132). These models are studied for the turbulent flow through a square duct which involves a secondary flow and significant anisotropy between the turbulent Reynolds stress tensor components. An a priori evaluation of these models is made using direct numerical simulation (DNS) results of Navier–Stokes equations. In order to handle wall proximity effects, a damping function is suggested. The material frame-indifference (MFI) of these models is studied using the eigenvectors of the rate-of-deformation tensor and their angular velocities. This procedure allows us to evaluate an objective vorticity tensor. For this flow, it is shown that the weak-equilibrium assumption used in the derivation of EASMs is verified, i.e. the material derivative of the anisotropy tensor b is negligeable (Db/Dt ≈ 0). Comparisons of results from EASM and from DNS shows that these models are able to predict reasonably well such flows. |
2004Article de journal ER5 Auteurs : Ould-amer, Yacine; Chikh, Salah; Naji, Hassane Attenuation of water coning using dual completion technology Dans: J. Petroleum Science Engineering, vol. 45, no. 1, p. 109 - 122, 2004, ISSN: 0920-4105, (ACL). Résumé | Liens @article{OULDAMER2004109,
title = {Attenuation of water coning using dual completion technology},
author = {Yacine Ould-amer and Salah Chikh and Hassane Naji},
url = {http://www.sciencedirect.com/science/article/pii/S092041050400066X},
doi = {https://doi.org/10.1016/j.petrol.2004.04.004},
issn = {0920-4105},
year = {2004},
date = {2004-01-01},
journal = {J. Petroleum Science Engineering},
volume = {45},
number = {1},
pages = {109 - 122},
abstract = {Water coning causes a reduction of oil production and an increase of production costs. Dual completion (downhole water sink) is one of the methods adopted to attenuate water coning. This work describes numerical results associated with this completion technique. The water cone shape and water breakthrough time are investigated to define the mechanism and performance of this technical procedure. The numerical results show that dual completion deforms the shape of the cone. For instance, the top of the water–oil interface is shifted away from the well yielding (under high water production rates) oil breakthrough into water perforations. The water breakthrough is proportional to dimensionless density difference and horizontal permeability and inversely proportional to oil production rate, mobility, and anisotropy ratios. High oil production rates yield elevation of water coning height that intercepts oil flow. Paradoxically, high production rate at water sink is not recommended, the improvement of water breakthrough begins when dimensionless density difference is greater than 0.05. The dual completion technique delays water breakthrough time (BT*). In general, the BT* is delayed by two times that of single completion and critical oil rate is augmented compared to single completion.},
note = {ACL},
keywords = {ER5},
pubstate = {published},
tppubtype = {article}
}
Water coning causes a reduction of oil production and an increase of production costs. Dual completion (downhole water sink) is one of the methods adopted to attenuate water coning. This work describes numerical results associated with this completion technique. The water cone shape and water breakthrough time are investigated to define the mechanism and performance of this technical procedure. The numerical results show that dual completion deforms the shape of the cone. For instance, the top of the water–oil interface is shifted away from the well yielding (under high water production rates) oil breakthrough into water perforations. The water breakthrough is proportional to dimensionless density difference and horizontal permeability and inversely proportional to oil production rate, mobility, and anisotropy ratios. High oil production rates yield elevation of water coning height that intercepts oil flow. Paradoxically, high production rate at water sink is not recommended, the improvement of water breakthrough begins when dimensionless density difference is greater than 0.05. The dual completion technique delays water breakthrough time (BT*). In general, the BT* is delayed by two times that of single completion and critical oil rate is augmented compared to single completion. |
2004Article de journal ER5 Auteurs : Sadek, Marwan; Isam, Shahrour Three-dimensional finite element analysis of the seismic behavior of inclined micropiles Dans: Soil Dynamics and Earthquake Engineering, vol. 24, no. 6, p. 473-485, 2004, (ACL). Liens @article{sadek:hal-03930932,
title = {Three-dimensional finite element analysis of the seismic behavior of inclined micropiles},
author = {Marwan Sadek and Shahrour Isam},
url = {https://hal.archives-ouvertes.fr/hal-03930932},
doi = {10.1016/j.soildyn.2004.02.002},
year = {2004},
date = {2004-08-01},
urldate = {2004-08-01},
journal = {Soil Dynamics and Earthquake Engineering},
volume = {24},
number = {6},
pages = {473-485},
publisher = {Elsevier},
note = {ACL},
keywords = {ER5},
pubstate = {published},
tppubtype = {article}
}
|
2003Conférence ER5 Auteurs : Chauchois, Alexis; Antczak, Emmanuel; Defer, Didier; Duthoit, Bruno Auscultation de parements en béton par couplage d'impédance thermique et de thermographie infrarouge 6ème Colloque « Thermique des Systèmes à Température Modérée », Québec (Canada), 2003, (ACTI). @conference{Chau2003b,
title = {Auscultation de parements en béton par couplage d'impédance thermique et de thermographie infrarouge},
author = {Alexis Chauchois and Emmanuel Antczak and Didier Defer and Bruno Duthoit},
year = {2003},
date = {2003-01-01},
booktitle = {6ème Colloque « Thermique des Systèmes à Température Modérée »},
address = {Québec (Canada)},
note = {ACTI},
keywords = {ER5},
pubstate = {published},
tppubtype = {conference}
}
|
2003Article de journal ER5 Auteurs : Chauchois, Alexis; Defer, Didier; Antczak, Emmanuel; Duthoit, Bruno Use of noninteger identification models for monitoring soil water content Dans: Measurement Science and Technology, vol. 14, no. 6, p. 868, 2003, (ACL). @article{ChauchoisDidierEmmanuelEtAl2003b,
title = {Use of noninteger identification models for monitoring soil water content},
author = {Alexis Chauchois and Didier Defer and Emmanuel Antczak and Bruno Duthoit},
year = {2003},
date = {2003-01-01},
journal = {Measurement Science and Technology},
volume = {14},
number = {6},
pages = {868},
publisher = {IOP Publishing},
note = {ACL},
keywords = {ER5},
pubstate = {published},
tppubtype = {article}
}
|
2002Article de journal ER5 Auteurs : El-Yahyaoui, Omar; Mompean, Gilmar; Naji, Hassane Evaluation a priori d'un modèle non-linéaire de turbulence Dans: Comptes Rendus Mécanique, vol. 330, no. 1, p. 27 - 34, 2002, ISSN: 1631-0721, (ACL). Résumé | Liens @article{El-Yahyaoui2002,
title = {Evaluation a priori d'un modèle non-linéaire de turbulence},
author = {Omar El-Yahyaoui and Gilmar Mompean and Hassane Naji},
url = {http://www.sciencedirect.com/science/article/pii/S1631072102014237},
doi = {https://doi.org/10.1016/S1631-0721(02)01423-7},
issn = {1631-0721},
year = {2002},
date = {2002-01-01},
journal = {Comptes Rendus Mécanique},
volume = {330},
number = {1},
pages = {27 - 34},
abstract = {The aim of this work is a priori evaluation and improvement of a non-linear model for turbulent flows using the results from direct numerical simulation of Navier–Stokes equations. The algebraic explicit non-linear model recently proposed by Rumsey C.L. et al. [1] is studied. The data base used here comes from a direct numerical simulation of a turbulent flow through a square duct. For this flow, this study shows that the hypothesis of equilibrium state for the anisotropic tensor is correct. The analysis is made using the maps of the second and third invariants of the Reynolds stress tensor. The approach used permits to conclude that the model using a wall function improves the numerical prediction of the anisotropy.},
note = {ACL},
keywords = {ER5},
pubstate = {published},
tppubtype = {article}
}
The aim of this work is a priori evaluation and improvement of a non-linear model for turbulent flows using the results from direct numerical simulation of Navier–Stokes equations. The algebraic explicit non-linear model recently proposed by Rumsey C.L. et al. [1] is studied. The data base used here comes from a direct numerical simulation of a turbulent flow through a square duct. For this flow, this study shows that the hypothesis of equilibrium state for the anisotropic tensor is correct. The analysis is made using the maps of the second and third invariants of the Reynolds stress tensor. The approach used permits to conclude that the model using a wall function improves the numerical prediction of the anisotropy. |
2002Conférence ER5 Auteurs : Chauchois, Alexis; Antczak, Emmanuel; Defer, Didier; Duthoit, Bruno Characterization of the thermal effusivity of a system by fractional differential equations. Application to a wet soil exposed to natural weathering 16 TH ECTP (European Conference on Thermo Physical Properties, London (GB), 2002, (ACTI). @conference{Chau2002b,
title = {Characterization of the thermal effusivity of a system by fractional differential equations. Application to a wet soil exposed to natural weathering},
author = {Alexis Chauchois and Emmanuel Antczak and Didier Defer and Bruno Duthoit},
year = {2002},
date = {2002-01-01},
booktitle = {16 TH ECTP (European Conference on Thermo Physical Properties},
address = {London (GB)},
note = {ACTI},
keywords = {ER5},
pubstate = {published},
tppubtype = {conference}
}
|
2001Article de journal ER5 Auteurs : Defer, Didier; Antczak, Emmanuel; Duthoit, Bruno Measurement of low-thermal effusivity of building materials using thermal impedance method Dans: Measurement Science and Technology, vol. 12, no. 5, p. 549, 2001, (ACL). @article{DeferAntczakDuthoit2001,
title = {Measurement of low-thermal effusivity of building materials using thermal impedance method},
author = {Didier Defer and Emmanuel Antczak and Bruno Duthoit},
year = {2001},
date = {2001-01-01},
journal = {Measurement Science and Technology},
volume = {12},
number = {5},
pages = {549},
publisher = {IOP Publishing},
note = {ACL},
keywords = {ER5},
pubstate = {published},
tppubtype = {article}
}
|
2001Article de journal ER5 Auteurs : Delacre, Elisabeth; Defer, Didier; Antczak, Emmanuel; Duthoit, Bruno Identification by thermal impedance: application to wet materials Dans: High Temperatures. High Pressures, vol. 33, no. 3, p. 337–344, 2001, (ACL). @article{DelacreDeferAntczakEtAl2001,
title = {Identification by thermal impedance: application to wet materials},
author = {Elisabeth Delacre and Didier Defer and Emmanuel Antczak and Bruno Duthoit},
year = {2001},
date = {2001-01-01},
journal = {High Temperatures. High Pressures},
volume = {33},
number = {3},
pages = {337--344},
publisher = {Pion},
note = {ACL},
keywords = {ER5},
pubstate = {published},
tppubtype = {article}
}
|
2001Article de journal ER5 Auteurs : Younsi, Rachid; El-Batanony, Ismail; Tritsch, Jean-Bernard; Naji, Hassane; Landjerit, Bernard Dynamic study of a wind turbine blade with horizontal axis Dans: Europ. J. Mechanics - A/Solids, vol. 20, no. 2, p. 241 - 252, 2001, ISSN: 0997-7538, (ACL). Résumé | Liens @article{YOUNSI2001241,
title = {Dynamic study of a wind turbine blade with horizontal axis},
author = {Rachid Younsi and Ismail El-Batanony and Jean-Bernard Tritsch and Hassane Naji and Bernard Landjerit},
url = {http://www.sciencedirect.com/science/article/pii/S099775380001127X},
doi = {https://doi.org/10.1016/S0997-7538(00)01127-X},
issn = {0997-7538},
year = {2001},
date = {2001-01-01},
journal = {Europ. J. Mechanics - A/Solids},
volume = {20},
number = {2},
pages = {241 - 252},
abstract = {The study of the dynamic behavior of a wind turbine with horizontal axis can be undertaken by various methods of analysis. The effects of the change of the aerodynamic flow (in the steady and unsteady cases), the variation of parameters of the cinematic movement (angle of attack, pitch angle and yaw angle) and the definition of subsystems characteristics that makes the wind turbine (blade, nacelle and pylon) allow one to characterize the structural dynamic behavior of the wind turbine. It is therefore necessary to develop these items. Once this is done, the structural dynamic behavior of the system can be improved. The term `improve' means the increase of the life duration by mastering the fatigue effects and the reduction of cost without sacrificing the aerodynamic output. The present study aims to examine the behavior of the blade, which is the main part of the wind turbine in that it that transmits forces to all other parts of the structure. The model is based on the theory of three-dimensional beams, under the assumption of variable sections of the type NACA 4415 airfoil, and takes into account membrane, transversal shear, flexion and free torsion effects. With regards to the aerodynamic loads (the lift, the drag and the pitching moment), a validation has been undertaken by considering experimental data and numerical results obtained by a CFD code (Fluent). The forces are obtained by means of a parametric CAD method interpolation of the aerodynamic poles by Bézier patch under geometrical constraints solved by a Simplex type algorithm. The emphasis is put on dynamic aspects by a complete processing of the dynamic equilibrium equation, applied to the wind turbine blade with horizontal axis.},
note = {ACL},
keywords = {ER5},
pubstate = {published},
tppubtype = {article}
}
The study of the dynamic behavior of a wind turbine with horizontal axis can be undertaken by various methods of analysis. The effects of the change of the aerodynamic flow (in the steady and unsteady cases), the variation of parameters of the cinematic movement (angle of attack, pitch angle and yaw angle) and the definition of subsystems characteristics that makes the wind turbine (blade, nacelle and pylon) allow one to characterize the structural dynamic behavior of the wind turbine. It is therefore necessary to develop these items. Once this is done, the structural dynamic behavior of the system can be improved. The term `improve' means the increase of the life duration by mastering the fatigue effects and the reduction of cost without sacrificing the aerodynamic output. The present study aims to examine the behavior of the blade, which is the main part of the wind turbine in that it that transmits forces to all other parts of the structure. The model is based on the theory of three-dimensional beams, under the assumption of variable sections of the type NACA 4415 airfoil, and takes into account membrane, transversal shear, flexion and free torsion effects. With regards to the aerodynamic loads (the lift, the drag and the pitching moment), a validation has been undertaken by considering experimental data and numerical results obtained by a CFD code (Fluent). The forces are obtained by means of a parametric CAD method interpolation of the aerodynamic poles by Bézier patch under geometrical constraints solved by a Simplex type algorithm. The emphasis is put on dynamic aspects by a complete processing of the dynamic equilibrium equation, applied to the wind turbine blade with horizontal axis. |
2001Conférence ER5 Auteurs : Chauchois, Alexis; Defer, Didier; Antczak, Emmanuel; Duthoit, Bruno Monitoring of the water content of a porous environment by measurement of the thermal effusivity 5ème Colloque « Thermique des Systèmes à Température Modérée », Lyon (France), 2001, (ACTI). @conference{chau2001ab,
title = {Monitoring of the water content of a porous environment by measurement of the thermal effusivity},
author = {Alexis Chauchois and Didier Defer and Emmanuel Antczak and Bruno Duthoit},
year = {2001},
date = {2001-01-01},
booktitle = {5ème Colloque « Thermique des Systèmes à Température Modérée »},
address = {Lyon (France)},
note = {ACTI},
keywords = {ER5},
pubstate = {published},
tppubtype = {conference}
}
|
2001Article de journal ER5 Auteurs : Shahrour, Isam; Sadek, Marwan; Ousta, Rami Seismic Behavior of Micropiles: Used as Foundation Support Elements: Three-Dimensional Finite Element Analysis Dans: Transportation Research Record, vol. 1772, no. 1, p. 84-90, 2001, (ACL). Liens @article{shahrour:hal-03930945,
title = {Seismic Behavior of Micropiles: Used as Foundation Support Elements: Three-Dimensional Finite Element Analysis},
author = {Isam Shahrour and Marwan Sadek and Rami Ousta},
url = {https://hal.archives-ouvertes.fr/hal-03930945},
doi = {10.3141/1772-10},
year = {2001},
date = {2001-01-01},
urldate = {2001-01-01},
journal = {Transportation Research Record},
volume = {1772},
number = {1},
pages = {84-90},
publisher = {SAGE Journal},
note = {ACL},
keywords = {ER5},
pubstate = {published},
tppubtype = {article}
}
|
1998Article de journal ER5 Auteurs : Defer, Didier; Antczak, Emmanuel; Duthoit, Bruno The characterization of thermophysical properties by thermal impedance measurements taken under random stimuli taking sensor-induced disturbance into account Dans: Measurement Science and Technology, vol. 9, no. 3, p. 496, 1998, (ACL). @article{DeferAntczakDuthoit1998,
title = {The characterization of thermophysical properties by thermal impedance measurements taken under random stimuli taking sensor-induced disturbance into account},
author = {Didier Defer and Emmanuel Antczak and Bruno Duthoit},
year = {1998},
date = {1998-01-01},
journal = {Measurement Science and Technology},
volume = {9},
number = {3},
pages = {496},
publisher = {IOP Publishing},
note = {ACL},
keywords = {ER5},
pubstate = {published},
tppubtype = {article}
}
|
1994Thèse ER5 Auteurs : Defer, Didier Théorie du signal appliquée à la caractérisation thermique et au contrôle non destructif des ouvrages in situ sous sollicitations aléatoires 1994, (TH). @phdthesis{Defer1994,
title = {Théorie du signal appliquée à la caractérisation thermique et au contrôle non destructif des ouvrages in situ sous sollicitations aléatoires},
author = {Didier Defer},
year = {1994},
date = {1994-01-01},
note = {TH},
keywords = {ER5},
pubstate = {published},
tppubtype = {phdthesis}
}
|
1994Article de journal ER5 Auteurs : Duthoit, Bruno; Defer, Didier; Antczak, Emmanuel; Oter, Liliane In-situ characterization of soil effusivity by measurement of thermal admittance Dans: High Temperatures. High Pressures, vol. 26, no. 2, p. 225–230, 1994, (ACL). @article{DuthoitDeferAntczakEtAl1994,
title = {In-situ characterization of soil effusivity by measurement of thermal admittance},
author = {Bruno Duthoit and Didier Defer and Emmanuel Antczak and Liliane Oter},
year = {1994},
date = {1994-01-01},
journal = {High Temperatures. High Pressures},
volume = {26},
number = {2},
pages = {225--230},
publisher = {Pion},
note = {ACL},
keywords = {ER5},
pubstate = {published},
tppubtype = {article}
}
|
1986Article de journal ER5 Auteurs : Naji, Hassane The prediction of turbulent swirling jet flow Dans: Int. J. Heat Mass Transfer, vol. 29, no. 2, p. 169 - 182, 1986, ISSN: 0017-9310, (ACL). Résumé | Liens @article{NAJI1986169,
title = {The prediction of turbulent swirling jet flow},
author = {Hassane Naji},
url = {http://www.sciencedirect.com/science/article/pii/0017931086902255},
doi = {https://doi.org/10.1016/0017-9310(86)90225-5},
issn = {0017-9310},
year = {1986},
date = {1986-01-01},
journal = {Int. J. Heat Mass Transfer},
volume = {29},
number = {2},
pages = {169 - 182},
abstract = {A space marching integration procedure is used to solve the Reynolds equations governing the axisymmetric incompressible turbulent swirling jet flow. Turbulence is modelled by the k−ε model with an isotropic turbulent viscosity. Besides mean velocity field, turbulent properties—such as Reynolds stresses, turbulent kinetic energy and dissipation rate—are obtained and the results are compared with experimental data. Agreement is quite encouraging and shows that the assumption of isotropic turbulent viscosity seems plausible.
Résumé
Une procédure de calcul pas à pas a été prise comme base de résolution numérique des équations de Reynolds gouvernant l'écoulement turbulent dans un jet tournant. Le caractère turbulent a été pris en compte par une modélisation simple basée sur le concept d'une viscosité turbulente dont la détermination a été réalisée àl'aide du modèle k−ε. Le calcul a permis de déterminer, en plus des profils de vitesses moyennes, les tensions de Reynolds, l'énergie cinétique de turbulence et son taux de dissipation. L'accord avec les résultats expérimentaux est relativement satisfaisant et montre que l'utilisation d'une viscosité turbulente isotropique semble correcte.
Zusammenfassung
Eine räumlich fortschreitende Integrationsmethode wurde verwendet, um die Reynolds'-schen Gleichungen zu lösen, welche die achsensymmetrische, inkompressible, turbulente Strömung eines rotierenden Strahls beschreiben. Als Turbulenzmodell wurde das k−ε-Modell mit isotroper turbulenter Viskosität gewählt. Auβer dem mittleren Geschwindigkeitsfeld wurden die turbulenten Eigenschaften, wie z.B. Reynolds'sche Schubspannung, kinetische Turbulenzenergie sowie die Dissipationsrate, berechnet. Die Ergebnisse wurden mit experimentellen Daten verglichen. Die Übereinstimmung ist relativ gut und zeigt, daβ die Annahme einer isotropen turbulenten Viskosität gerechtfertigt erscheint.
Реферат
Иcпoльзyeтcя мeтoд пpocтpaнcтвeннoгo интeгpиpoвaния для peшeния ypaвнeний Peйнoльдca, oпиcывaющиx ocecиммeтpичнoe нecжимaeмoe тypбyлeнтнoe зaкpyчeннoe cтpyйнoe тeчeниe. Иcпoльзyeтcя k−ε мoдeль c изoтpoпнoй тypбyлeнтнoй вязкocтью. Пoмимo pacпpeдeлeния ocpeднeнныx cкopocтeй oпpeдeлeны тaкиe xapaктepиcтики тypвyлeнтнocти, кaк нaпpяжeния Peйнoльдca, тypбyлeнтнaя кинeтичecкaя энepгия и cкopocть диccипaции. Пpoвeдeнo cpaвнeниe c экcпepимeнтaльными дaнными и пoлyчeнo oбнaдeживaющee cooтвeтcтвиe. Пoкaзaнo, чтo дoпyщeниe oб изoтpoпнoй тypбyлeнтнoй вязкocти являeтcя впoлнe oпpaвдaнным.},
note = {ACL},
keywords = {ER5},
pubstate = {published},
tppubtype = {article}
}
A space marching integration procedure is used to solve the Reynolds equations governing the axisymmetric incompressible turbulent swirling jet flow. Turbulence is modelled by the k−ε model with an isotropic turbulent viscosity. Besides mean velocity field, turbulent properties—such as Reynolds stresses, turbulent kinetic energy and dissipation rate—are obtained and the results are compared with experimental data. Agreement is quite encouraging and shows that the assumption of isotropic turbulent viscosity seems plausible.
Résumé
Une procédure de calcul pas à pas a été prise comme base de résolution numérique des équations de Reynolds gouvernant l'écoulement turbulent dans un jet tournant. Le caractère turbulent a été pris en compte par une modélisation simple basée sur le concept d'une viscosité turbulente dont la détermination a été réalisée àl'aide du modèle k−ε. Le calcul a permis de déterminer, en plus des profils de vitesses moyennes, les tensions de Reynolds, l'énergie cinétique de turbulence et son taux de dissipation. L'accord avec les résultats expérimentaux est relativement satisfaisant et montre que l'utilisation d'une viscosité turbulente isotropique semble correcte.
Zusammenfassung
Eine räumlich fortschreitende Integrationsmethode wurde verwendet, um die Reynolds'-schen Gleichungen zu lösen, welche die achsensymmetrische, inkompressible, turbulente Strömung eines rotierenden Strahls beschreiben. Als Turbulenzmodell wurde das k−ε-Modell mit isotroper turbulenter Viskosität gewählt. Auβer dem mittleren Geschwindigkeitsfeld wurden die turbulenten Eigenschaften, wie z.B. Reynolds'sche Schubspannung, kinetische Turbulenzenergie sowie die Dissipationsrate, berechnet. Die Ergebnisse wurden mit experimentellen Daten verglichen. Die Übereinstimmung ist relativ gut und zeigt, daβ die Annahme einer isotropen turbulenten Viskosität gerechtfertigt erscheint.
Реферат
Иcпoльзyeтcя мeтoд пpocтpaнcтвeннoгo интeгpиpoвaния для peшeния ypaвнeний Peйнoльдca, oпиcывaющиx ocecиммeтpичнoe нecжимaeмoe тypбyлeнтнoe зaкpyчeннoe cтpyйнoe тeчeниe. Иcпoльзyeтcя k−ε мoдeль c изoтpoпнoй тypбyлeнтнoй вязкocтью. Пoмимo pacпpeдeлeния ocpeднeнныx cкopocтeй oпpeдeлeны тaкиe xapaктepиcтики тypвyлeнтнocти, кaк нaпpяжeния Peйнoльдca, тypбyлeнтнaя кинeтичecкaя энepгия и cкopocть диccипaции. Пpoвeдeнo cpaвнeниe c экcпepимeнтaльными дaнными и пoлyчeнo oбнaдeживaющee cooтвeтcтвиe. Пoкaзaнo, чтo дoпyщeниe oб изoтpoпнoй тypбyлeнтнoй вязкocти являeтcя впoлнe oпpaвдaнным. |
