Changements d’échelle

 

Le but de ces journées était de comparer les méthodes actuelles utilisées pour décrire les changements d’échelle, en physique et en mécanique.

Les changements d’échelle concernent aussi bien les lois de comportement en mécanique du solide, que la séparation d’échelles en turbulence, ou encore les mécanismes de dissipation. Ces journées ont été l’occasion de faire le point sur les méthodes actuelles de changements d’échelles spatiales, mais aussi les méthodes de changements d’échelles temporelles (exemple de la réponse vibratoire, ou des sollicitations extrêmes).

 

Space-Time Multiscale Methods

The purpose of this workshop was the comparison between current rescaling methods, in physics and in mechanics.
Rescaling concerns constitutive laws in solid mechanics, as well as scale separation in turbulence, or even dissipative processes.

This workshop focused on current methods for spatial rescaling, but also temporal rescaling (that appears for example in vibrational response, or in extreme forcing)

 

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Support des presentations

voici les pdf de plusieurs présentations de la journée :

• J. Bleyer,   Generalized continuum media by change of scale in materials reinforced with long fibres
• L. Chevillard,  On the multiscale nature of turbulence in fluids
• D. Dureisseix, An homogenization example of a material with non-conventional microstructure: thermal memory effect and uncertainties
• S. Giordano,Mechanical properties of chains with bistable (two-state) units 
• A. Glacet, Coarse-Graining method for a continuum approximation of discrete media
• F. Maresca, Contributions of austenite to martensite transformation to deformability of steels: from atomistic mechanisms to microstructural response
• F. Méhats, Application of averaging technique for the numerical simulation of highly oscillatory problems
• E. Savin, Multiple scattering of acoustic waves in random flow
• W. Schirmacher, Theory of heterogeneous visco-elasticity

 

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Quand, où ?

le 5 juin 2018,

à l’IPGP, salle P07 (outremer). Pause et buffet dans la médiathèque.

1, rue Jussieu 75005 Paris.   (où est-ce excatement ?/ where is it?)

 

Programme / Program

• 10h – 11h40  Rescaling with multiple time scales
  
  • A. Maurel,  Double scale homogenization in some dynamics problems (20’+3′)
  • F. Méhats,  Application of averaging technique for the numerical simulation of highly oscillatory problems (12’+3′)
  • W. Schirmacher,  Theory of heterogeneous visco-elasticity (20’+3′)
  • B. Tie,  Wave propagation in honeycomb sandwich panels (12’+3′)
  • E. Savin,  Multiple scattering of acoustic waves in random flow (12’+3′)
• 11h40 -12h00  Pause
• 12h00-13h00  Rescaling in Material science
  
  • J. Bleyer,  Generalized continuum media by change of scale in materials reinforced with long fibres (12’+3′)
  • S. Giordano,  Mechanical properties of chains with bistable (two-state) units (12’+3′)
  • F. Maresca,  Contributions of austenite to martensite transformation to deformability of steels: from atomistic mechanisms to microstructural response (12’+3′)
  • M. Upadhyay,  Biaxial load path change response of stainless steel: synergy between multi-scale modeling and experiments (12’+3′)
• 13h00-14h00  Lunch
  
• 14h00-15h40  Spatial rescaling
  
  • D. Dureisseix,  An homogenization example of a material with non-conventional microstructure: thermal memory effect and uncertainties (20’+3′)
  • A. Glacet,  Coarse-Graining method for a continuum approximation of discrete media (12’+3′)
  • A. Fedorenko,  Why one needs a functional renormalization group to study disordered elastic systems (20’+3′)
  • I. Stefanou,  The effect of grain size on the Thermo-Hydro-Mechanical behavior of faults though Cosset continua (12’+3′)
  • D. Kondo,  On some variational approaches in nonlinear composites and nano composites (20’+3′)
• 15h40-16h00 Pause
• 16h00- 17h00 Rescaling in out-of-equilibrium phenomena
  
  • L. Chevillard,  On the multiscale nature of turbulence in fluids (20’+3′)
  • F. Vernerey,  Multiscale modeling of transient networks: the example of insect aggregations (12’+3′)
  • B. Seoane,  Statics-dynamics equivalence through the fluctuation–dissipation ratio (12’+3′)

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