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PMMH’s weekly seminar is held every Friday at 11 am (map)
Alice Pelosse
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 — Dmitry Kolomenskiy (Skolkovo Institute of Science and Technology, Russia)
Flight mechanics of the smallest insects
Microinsects with body sizes below 2 millimetres evolved from larger ancestors through natural selection to occupy specialized ecological niches. During miniaturization, many retained their major organs and functions, including the ability to fly. Moreover, microinsects from different orders convergently evolved morphological adaptations to the physical constraints that matter at such small scales.
In this talk, I will focus on flight and examine the insect flight apparatus from an engineering perspective, considering the mechanical factors that determine performance as well as the objectives and constraints that shape possible optimal designs. In particular, microinsect wings are notable because they operate near the lower limit of inertial scaling for aerodynamic forces. The Reynolds number, which measures the ratio of inertial to viscous forces in the airflow, is approximately 10. At this Reynolds number (which can be termed as intermediate) neither inertial nor viscous effects dominate.
I will show how microinsect geometrical and kinematic parameters are finely tuned to the flow regime set by their size. The first part of the talk will give a brief overview of current microinsect flight research. The second part will contain illustrative examples from our recent work on the beetle Paratuposa placentis and the waspsTrichogramma cacoeciae and Megaphragma viggianii, highlighting their distinct kinematic and morphological traits. The third part will focus on theoretical analyses of aerodynamic mechanisms.
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Seminars (1)
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Séminaire PMMH - Carlos Málaga Iguiñiz (UNAM, Mexico)
Vendredi 5 juin de 11h00 à 12h00 - Salle réunion PMMH 1
The Lattice Boltzmann Method
The lattice-Boltzmann method is a relatively new numerical scheme for fluid dynamics simulations. It is a non-conventional method in the sense that it is not built around the equations of fluid motion. Instead, it computes solutions to the Navier-Stokes equations indirectly based on the Boltzmann equation that (…)
The audience is composed of people with rather heterogeneous backgrounds including specialists in solids, fluids, granular flows, statistical physics... so the idea is to keep your talk understandable by people not necessarily working in your field... The seminar time slot runs from 11am to noon so the best is to make the talk last around 45 minutes to leave some time for discussion.
- Séminaires ESPCI-ENS de biophysique
- Séminaires du Département de Physique de l’ENS
- Séminaires du Laboratoire d’Hydrodynamique de l’X
- 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
Link to cofee seminar (internal, every Thursday)
