CNRS Laboratory for Hydrodynamics, Energetics & Atmospheric Environment

Nantes, France

CNRS Laboratory for Hydrodynamics, Energetics & Atmospheric Environment

Nantes, France
SEARCH FILTERS
Time filter
Source Type

Flavia F.,CNRS Laboratory for Hydrodynamics, Energetics & Atmospheric Environment | Clement A.H.,CNRS Laboratory for Hydrodynamics, Energetics & Atmospheric Environment
Applied Ocean Research | Year: 2017

The Direct Matrix Method Interaction Theory (IT) proposed by Kagemoto and Yue [1] speeds up the computation of hydrodynamic coefficients for large arrays of bodies when compared to direct calculations using standard Boundary Element Method (BEM) solvers. One of the most computationally expensive parts of the matrix method is the calculation of two hydrodynamic operators, known as Diffraction Transfer Matrix (DTM) and Radiation Characteristics (RC), which describe the way an isolated geometry scatters and radiates waves, respectively. A third operator, called Force Transfer Matrix (FTM), was introduced by McNatt et al. [2] to facilitate the calculation of the forces exerted on the bodies. In this paper, a novel set of relations between the FTM and RC components is obtained using the Kochin functions specific to the cylindrical basis solutions. They extend the classical Haskind's relations, valid with incident plane waves, to the cylindrical components of the scattered and radiated fields. Moreover, an alternative demonstration of the identities is given, which does not rely on the far-field asymptotic representation of the potential. Additional expressions are provided that relate the hydrodynamic coefficients and the RC for isolated bodies as well as for arrays, and numerical checking of the derived mathematical expressions is presented. These new relations can be used to speed up calculation of the hydrodynamic operators required for the use of the IT and to test its accuracy. © 2017 Elsevier Ltd


Guilmineau E.,CNRS Laboratory for Hydrodynamics, Energetics & Atmospheric Environment | Deng G.,CNRS Laboratory for Hydrodynamics, Energetics & Atmospheric Environment | Wackers J.,CNRS Laboratory for Hydrodynamics, Energetics & Atmospheric Environment
Journal of Fluids and Structures | Year: 2011

A Detached Eddy Simulation (DES) approach is used to investigate the main flow features of the Ahmed body. The flow around the Ahmed body exhibits basic features which are characteristic of real ground vehicles. This work presents unsteady flow simulations at the rear slant angle 25° using the ISIS-CFD flow solver which is developed by the CFD Department of the Fluid Mechanics Laboratory of Ecole Centrale de Nantes. Several versions of the DES models which are based on the k-ω SST turbulence model are used. An Explicit Algebraic Reynolds Stress Model for the turbulence modeling is also used to compare the DES approaches with a Reynolds-Averaged Navier-Stokes (RANS) solution. The flow on the slanted surface and in the wake is discussed. Averaged velocities and turbulent kinetic energy profiles are compared with the experimental data. This work shows that the DES approaches, and particularly the DES-SST model, give a better solution compared with the RANS solution. However, the bubble in the rear slant is not predicted by the DES approaches. © 2011 Elsevier Ltd.


Maiboom A.,CNRS Laboratory for Hydrodynamics, Energetics & Atmospheric Environment | Tauzia X.,CNRS Laboratory for Hydrodynamics, Energetics & Atmospheric Environment
Fuel | Year: 2011

Automotive Diesel engines exhaust emissions must constantly be reduced to comply with more and more stringent regulations, all over the world. The introduction of water in the combustion chamber is already used on some large marine diesel engines to cut down NOx emission. In this paper an experimental study is conducted on a modern automotive 1.5 l HSDI Diesel engine while injecting a water-in-diesel emulsion (WDE) with a volumetric water-to-fuel ratio of 25.6%. Four injection strategies are considered with and without pilot injection, with two levels of injection pressure. First, the injection of WDE is compared to diesel-fuel in terms of combustion and NOx and PM emissions without using exhaust gas recirculation (EGR). Depending on the WDE fuelling rate and injection strategy (with or without a pilot injection before main injection), NOx emissions are most often reduced (of up to 50%), and PM emission are most often decreased as well (the maximum relative reduction being 94%). The combustion is largely affected by the injection of WDE as compared with pure diesel-fuel, the main observations being an increased of the ignition delay and an improved mixing-process between the fuel and the surrounding gases. After that, the use of WDE in parallel with EGR (with various EGR rates) is tested with the aim at improving the NOx-PM trade-off (reduction of NOx emission at a given PM emission level or reduction of PM emission at a given NOx emission level). The results show that this method is an effective way for NOx and PM emission reduction on an automotive Diesel engine. © 2011 Elsevier Ltd. All rights reserved.


Perret L.,CNRS Laboratory for Hydrodynamics, Energetics & Atmospheric Environment | Savory E.,University of Western Ontario
Boundary-Layer Meteorology | Year: 2013

An analysis of the dynamics of the flow over a street canyon immersed in an atmospheric boundary layer is presented, using particle image velocimetry measurements in a wind tunnel. Care was taken to generate a 1:200 model scale urban type boundary layer that is correctly scaled to the size of the canyon buildings. Using proper orthogonal decomposition (POD) of the velocity field and conditional averaging techniques, it is first shown that the flow above the opening of the canyon consists of a shear layer separating from the upstream obstacle, animated by a coherent flapping motion and generating large-scale vortical structures. These structures are alternately injected into the canyon or shed off the obstacle into the outer flow. It is shown that unsteady fluid exchanges between the canyon and the outer flow are mainly driven by the shear layer. Finally, using POD, the non-linear interaction between the large-scale structures of the oncoming atmospheric boundary layer and the flow over the canyon is demonstrated. © 2013 Springer Science+Business Media Dordrecht.


Tauzia X.,CNRS Laboratory for Hydrodynamics, Energetics & Atmospheric Environment | Maiboom A.,CNRS Laboratory for Hydrodynamics, Energetics & Atmospheric Environment | Shah S.R.,CNRS Laboratory for Hydrodynamics, Energetics & Atmospheric Environment
Energy | Year: 2010

This paper describes an experimental study conducted on a modern high speed common-rail automotive Diesel engine in order to evaluate the effects on combustion and pollutant emissions of water injected as a fine mist in the inlet manifold.First, a literature survey describing the several ways to introduce water in an internal combustion engine and reporting the main results from previous studies is presented. It is followed by a short description of the engine and experimental set-up.After that, various results are presented. A special focus is made on water injection (WI) cooling effect. Then, the influence of WI on ignition delay, rate of heat release, nitrogen oxides (NOx) and particulate matter (PM) emissions and engine efficiency is analysed, for various engine operating conditions (speed and load) and various amount of water (up to 4 times the amount of fuel injected). A comparison is made with exhaust gas recirculation to evaluate the potential of inlet WI as an in-cylinder emissions reduction device for automotive application. © 2010 Elsevier Ltd.


Guilmineau E.,CNRS Laboratory for Hydrodynamics, Energetics & Atmospheric Environment
SAE International Journal of Passenger Cars - Mechanical Systems | Year: 2010

This paper presents a finite-volume-based detached-eddy simulation for the prediction of flow around a passenger vehicle. The flow solver used is ISIS-CFD developed by the CFD Department of the Fluid Mechanics Laboratory of Ecole Centrale de Nantes. The validation is carried out by a crosswind simulation around the squareback Willy model. The model was designed in order that separations are limited to the region of the base for a moderate yaw angle. This model without sharp corners on the fore body and a square base is more convenient for the analysis of unsteady separations limited on its leeward side and base. The angle between the upstream velocity and the direction of the model varies between 0° and 30°. The results are compared to a previous numerical study obtained with a RANS simulation and experimental data. All comparisons (aerodynamic forces, wall pressures, and topology of total pressure) show that DES simulations give a better agreement with experimental data, particularly for the large yaw angles. The second model is the classical Ahmed body with the slant angle of 25°. With a RANS simulation, we have a massive separation in the wake while with DES simulation, the agreement is better with the experimental data. This paper shows that DES simulations give an improvement of the wake prediction for the automotive flow. © 2010 SAE International.


Josset C.,CNRS Nantes Thermocinetique Lab | Babarit A.,CNRS Laboratory for Hydrodynamics, Energetics & Atmospheric Environment | Clement A.H.,CNRS Laboratory for Hydrodynamics, Energetics & Atmospheric Environment
Proceedings of the Institution of Mechanical Engineers Part M: Journal of Engineering for the Maritime Environment | Year: 2015

This paper describes a numerical wave-to-wire model of the second-generation wave energy converter called SEAREV. Governing equations are given in the time domain for the motion of the masses involved in the device and for the hydraulic power take-off (PTO) used to convert the motion into electricity. The hydrodynamic forces are derived using the standard linear potential theory. The memory term in the radiation force is replaced by additional states using the Prony method in order to change the equation of motion into the ordinary differential equation form. The PTO is composed of hydraulic rams, an accumulator, and a hydraulic generator, which delivers electricity when there is enough energy stored in the accumulator.Using the MATLAB Simulink tool, the equation of motion is solved to simulate the full device (including the power take-off) from the incident wave to the electricity delivered to the grid. Simulation results are presented in the paper and comparisons are made with a simpler PTO: a linear damper. They show that the torque applied to the hydraulic PTO must exceed a threshold to start absorbing energy, unlike the linear damping model. They also show that the power production can be very discontinuous, depending on the level of the incident wave power. This is due to the fact that the generator considered can transform the energy stored in the accumulator faster than the energy transmitted by the rams into the accumulator. It could therefore be interesting to use several generators to adapt the electrical energy production to the level of incident wave power, or a generator that could work efficiently at part load in order to achieve continuous energy production. © 2007 Institution of Mechanical Engineers.


Politis G.,National Technical University of Athens | Politis K.,CNRS Laboratory for Hydrodynamics, Energetics & Atmospheric Environment
Journal of Fluids and Structures | Year: 2014

Marine mammals travel long distances by utilizing and transforming wave energy to thrust through proper control of their caudal fin. On the other hand, manmade ships traveling in a wavy sea store large amounts of wave energy in the form of kinetic energy for heaving, pitching, rolling and other ship motions. A natural way to extract this energy and transform it to useful propulsive thrust is by using a biomimetic wing. The aim of this paper is to show how an actively pitched biomimetic wing could achieve this goal when it performs a random heaving motion. More specifically, we consider a biomimetic wing traveling with a given translational velocity in an infinitely extended fluid and performing a random heaving motion with a given energy spectrum which corresponds to a given sea state. A formula is invented by which the instantaneous pitch angle of the wing is determined using the heaving data of the current and past time steps. Simulations are then performed for a biomimetic wing at different heave energy spectra, using an indirect Source-Doublet 3-D-BEM, together with a time stepping algorithm capable to track the random motion of the wing. A nonlinear pressure type Kutta condition is applied at the trailing edge of the wing. With a mollifier-based filtering technique, the 3-D unsteady rollup pattern created by the random motion of the wing is calculated without any simplifying assumptions regarding its geometry. Calculated unsteady forces, moments and useful power, show that the proposed active pitch control always results in thrust producing motions, with significant propulsive power production and considerable beneficial stabilizing action to ship motions. Calculation of the power required to set the pitch angle prove it to be a very small percentage of the useful power and thus making the practical application of the device very tractable. © 2012 Elsevier Ltd.


Ducrozet G.,CNRS Laboratory for Hydrodynamics, Energetics & Atmospheric Environment | Bonnefoy F.,CNRS Laboratory for Hydrodynamics, Energetics & Atmospheric Environment | Le Touze D.,CNRS Laboratory for Hydrodynamics, Energetics & Atmospheric Environment | Ferrant P.,CNRS Laboratory for Hydrodynamics, Energetics & Atmospheric Environment
European Journal of Mechanics, B/Fluids | Year: 2012

This paper presents the recent development on the nonlinear directional wave generation process in a 3D Numerical Wave Tank (NWT). The NWT is based on a nonlinear model using the High-Order Spectral (HOS) method, which exhibits high level of accuracy as well as efficiency properties provided by a Fast Fourier Transform (FFT) solution. The wavemaker modeling appears to be a key point in the simulation and it is carefully detailed. Different levels of approximation of the wave generation (up to third-order in nonlinearity) are studied. The properties of the numerical scheme in terms of convergence, stability and accuracy are discussed. This NWT features all the characteristics of the real wave tank (directional wavemaker, absorbing zone, perfectly reflective side walls). Furthermore, several validation results and practical applications where numerical simulations are successfully compared to experiments on 2D and 3D wave fields are presented. © 2012 Elsevier Masson SAS. All rights reserved.


Guilmineau E.,CNRS Laboratory for Hydrodynamics, Energetics & Atmospheric Environment
American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM | Year: 2014

Investigations of the aerodynamic influence of rotating wheels and moving ground on a realistic generic car model are presented. For this study, Computational Fluid Dynamics (CFD) are carried out with the flow solver ISIS-CFD, which is based on a finite-volume method. This paper presents the effects of ground simulation (GS) for the realistic car model DrivAer. Comparisons of the pressure between experimental data and numerical results show a good agreement. A moving ground and rotating wheels reduces the drag and the lift. Though the forces decreases at the front wheel due to the wheel rotation locally, the major change in drag and lift happens directly on the car body itself. The main vortical structures that develop around the wheels are also presented. Copyright © 2014 by ASME.

Loading CNRS Laboratory for Hydrodynamics, Energetics & Atmospheric Environment collaborators
Loading CNRS Laboratory for Hydrodynamics, Energetics & Atmospheric Environment collaborators