Pierre Saramito: research interests

     

Fig. 1 : [left] A viscoelastic fluid (e.g. a liquid polymer) flowing through an abrupt contraction ;
[right] A yield stress fluid (e.g. mud) flowing around an obstacle ; adaptive mesh
Click on the images to enlarge and get more comments.

This includes some theoretical researches

• New constitutive equations for elastoviscoplastic fluids
• Efficient numerical algorithms for viscoelastic and viscoplastic fluids
• C++ finite element codes, as free softwares.

and some applications

• Modeling of non-colloidal suspensions as a rate-independent viscoelastic fluid.
  With Olivier Ozenda (PhD, LJK, Grenoble) and Guillaume Chambon (IRSTEA, Grenoble).

  
  

  Fig. 2 : Couette inversion for a suspension (experimental data from F. Blanc et al.).

• Modeling of the arctic sea ice cover as a britle-viscoelastic fluid.
  With Véronique Dansereau (post-doc, Isterre, Grenoble) and Jérome Weiss (Isterre, Grenoble).

  
  

  Fig. 3 : A britle-viscoelastic model for the ice (Dansereau, Saramito, Weiss).
  Fractures appear and propagate during an uniaxial compression : view of the deformation.

• Simulation of volcanic lava flows with shallow-depth averaged viscoplastic models.
  With Noé Bernabeu (post-doc, LJK, Grenoble), Andrew Harris (LMV, Clermont-Ferrand) and Claude Smutek (IPGP, Saint-Denis de La Réunion).
  See also the LAVA project web site.

  
  

  Fig. 4 : Simulation of volcanic lava flows (Bernabeu, Saramito, Smutek).

• Partial derivative equation on a surface: application to morphogenesis, biological tissues.
  With Mahamar Dicko (former PhD, LJK, Grenoble) and Jocelyn Étienne (LIPHY, Grenoble).

  
  

  Fig. 5 : Gastrulation of a drosophila embryon: comparison between observation (op) and simulation (bottom).

• Simulation of foam flows
  with Ibrahim Cheddadi (former PhD stduent; now TIM-C, Grenoble) and François Graner (LMSC et Univ. Diderot, Paris).
  

  
  

  Fig. 6 : Foam flow around an obstacle: (top) simulation (Cheddadi, Saramito, Graner); (bottom) experiment.

  • Click here for a numerical simulation based video animation due to I. Cheddadi (gif, 0.7 mb).
  • Click here for an experimental observation based video animation due to M. Asipauskas (avi, 24 mb): bubbles are colored according to the number of sides: blue=7, red=5.
• Numerical modelling of red blood cells and vesicule membranes
  with Aymen Laadhari (ETH, Zurich, Suisse). and Chaouqi Misbah (Liphy, Grenoble).

  
  

  Fig. 7 : Tumbling of red blood cells and vesicle under shear flow:
  (top) experiment (Abkarian and Viallat, 2008);
  (bottom) simulation (Laadhari, Saramito, Misbah).

Previous research interests and applications

• Direct simulation of the motion of particles in flowing liquids (NSF project)
  with Daniel D. Jospeh and Roland Glowinski.
• Adaptive mesh for the epitaxial grown of cristal films
  with Éric Bonnetier and Morgan Brassel (LJK, Grenoble).
  See also the IMAG PIF project home page.
• Numerical simulation of mud flows
  with Dominique Laigle, Mohammed Naim (IRSTEA), Marie-Paul Cani and Fabrice Neyret (LJK, Grenoble).
• Numerical simulation of powder-snow avalanches in mountains
  with Jocelyn Étienne (former PhD student, now Liphy, Grenoble), and Emil Hopfinger (LEGI, Grenoble).
  

  
  

  Fig. 8 : Snow avalanche with aerosol and mesh adaptation (click on the images to enlarge).

  • Click here for watching a direct simulation of snow avalanche (gif, 7.6 mb).
  • Click here for a real movie where I present some new results on snow avalanches simulation (wmv, 49 mb).
  • Risques d'avalanches élevés : explication.
    Intervention à l'édition nationale du journal télévisé de la chaine FR3, le 24 f´vrier 2006, 12h-14h : cliquez ici (wmv, 6.7 mb).
• Structures and instabilities in geophysic and mechanic: analysis and simulation, with J. C. Paumier.