ESPCI web site
Le séminaire hebdomadaire du laboratoire PMMH a lieu tous les vendredis à 11h, au premier étage Barre Cassan, campus Jussieu (plan).
Stéphane Perrard
Etienne Reyssat
Virgile Thiévenaz
PMMH
BARRE CASSAN
BAT A 1ER ETAGE CASE 18
7 QUAI SAINT BERNARD
75005 PARIS
France
Tel : (33) 1 40 79 45 22
Séminaire PMMH - Alexis Mérigaud - IFPEN
Predicting ocean waves in real-time
Ocean waves are usually predicted in a meteorological sense, from hourly to weekly time scales. In this talk, we cover the much lesser-known topic of real-time ocean wave forecasting, which consists in predicting accurately the second-by-second motion of the sea surface, a ship or another floating structure, up to a few minutes in advance. Such real-time forecasts would be highly desirable to mitigate risks and costs, associated with the commissioning and maintenance of marine renewable energy systems.
We will first focus on ocean wave predictability : Given available observations of the sea surface, where, and when can the wave motion be predicted accurately ? We will show that the commonly employed model for “deterministic” prediction zones is unreasonably optimistic for realistic wave fields. Instead, a classical Gaussian wave field representation allows the rigorous calculation of “probabilistic” prediction zones, defined with respect to a given uncertainty criterion. Those prediction zones can have relatively simple physical interpretation. We then show experimental evidence of the validity of our wave predictability model.
Real-time wave forecasting implies that waves are also measured in real time and, as we will see, over large distances around the point of interest, which represents another scientific and technical challenge. We will thus briefly describe ongoing experimental and numerical work at IFP Energies Nouvelles, on remote wave measurements using sensors such as LiDARs and X-band marine radars.
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Séminaires récents (3)
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Séminaire PMMH - Vince Craig, Australian National University, Australia
Vendredi 11 juillet de 11h00 à 12h00 - Salle réunion PMMH 1
Underscreening Stable colloidal systems at very high electrolyte concentrations
In colloidal systems the range and strength of electrostatic interactions has a profound effect on a range of properties including the stability of colloidal dispersions and the phase behaviour of surfactant and polymer systems. The Debye length has proven to be a very effective measure of the range of (…) -
Séminaire PMMH - Salvatore Federico (University of Calgary, Canada)
Vendredi 4 juillet de 11h00 à 12h00 - Salle réunion PMMH 1
Continuum Mechanics of Hydrated Fibre-Reinforced Soft Tissues
Biological tissues can be represented as bi-phasic continua, with a porous solid phase saturated by an interstitial fluid and reinforced by collagen fibers. This lecture will give an overview of the modelling techniques for fibre-reinforced porous composite materials with statistical orientation of the fibers. Both (…) -
Séminaire PMMH - Salvatore Federico (University of Calgary, Canada)
Vendredi 4 juillet de 11h00 à 12h00 - Salle réunion PMMH 1
Continuum Mechanics of Hydrated Fibre-Reinforced Soft Tissues
Biological tissues can be represented as bi-phasic continua, with a porous solid phase saturated by an interstitial fluid and reinforced by collagen fibers. This lecture will give an overview of the modelling techniques for fibre-reinforced porous composite materials with statistical orientation of the fibers. Both (…)
Instructions générales pour les conférenciers
Le public du séminaire est très hétérogène (rien qu’au PMMH nous travaillons sur des thématiques très diverses, mécanique des fluides, des milieux granulaires, des solides, physique statistique, physique du mouillage, micro-fluidique, biophysique,...) l’objectif est donc de ne pas faire un séminaire trop spécialiste : au moins la première moitié du séminaire à un niveau accessible pour celui qui ne connaît rien sur le sujet.
Le séminaire a lieu à 11h. rendez-vous 15 minutes avant pour installer et tester la projection.
Le séminaire dure environ 45 minutes pour laisser un peu de temps pour discuter à la fin.
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- Séminaire de Mécanique d’Orsay (page web FAST)
- Séminaire de Mécanique d’Orsay (page web LIMSI)
- Séminaire de Mécanique des Fluides de l’Institut Jean le Rond d’Alembert
- Séminaires du laboratoire MSC, Paris VII
- Séminaires Gulliver
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