Numerical simulation

Persons in charge: 
Christophe GENGEMBRE

Our laboratory currently has two dedicated platforms for numerical simulations :

  • Nessy (NEtwork Solver SYstem)
  • SDT (Structural Dynamics Toolbox) / OpenFem

Nessy (NEtwork Solver SYstem) :

Persons involved :

Gérard Coffignal, Philippe Lorong, Lounes Illoul, Christophe Gengembre

Description :

Nessy offers development framework to solve big size non-linear problems using parallele coarse grain. It is intended to integrate and test new methods of modeling and numerical simulation in the laboratory. A first version of Nessy was born in 1996, but older works forms a part of it.

Amongs Nessy embeded applications we can make mention of : CNEM (Constrained Natural Element Method), Macro machining, specifical finite elements.

Nessy currently runs on Mac OS X (PowerPC and MacIntel), Linux/Unix. Nessy contains today about 4000 Fortran 77 subroutines but some parts are written in C or C++ languages.

We have recently embeded a part of Nessy's simulations into an Object Oriented project written in Python. This software offers a GUI that allow setting up data entries, launching Nessy instances in parallel or in series,  and authomaticaly analyse the results.

SDTools and openFEM :

Persons involved :

Etiennes Balmes, Jean-Philippe Bianchi, Guillaume Vermot des Roches

Description :

The SDTools private compagny team joined us in September 2008. SDTools specializes in providing open and extensible MATLAB® based solutions in expérimental modal analysis and finite element modeling for vibration problems.

This company offers 2 softwares :

  • OpenFEM (SDTools / INRIA): software distributed under GNU LGPL license. This is a general finite elements multi-physics code.
  • SDT (SDTools): this commercial toolbox provides tools for Experimental Modal Analysis and Finite Element Modeling for vibration problems, and also optimized solvers for large sizes.

Other numerical simulation activities :

Following computation codes are also used in our laboratory :

  • COMSOL Multiphysics
  • ABAQUS 6.7 à 6.9 (finite elements computing)
  • Materials Studio (molecular dynamics simulations)

Internal fortran code is sometimes used with Abaqus

Laboratory's calculators dedicated to numerical computing :

  • obelix : Ensam's cluster : bought in 2007 by LMSP and SINUMEF, this cluster is Under Linux. It contains 5 computation nodes. Every node embed 4 Intel processors Itanium 2 (dual core processors). Each core running at 1,6 GHz. Cach memory: 18M (9 Mo by core). Every node has a RAM of 32 Go.
  • lms-tesla : This computer is based on an i7 processor and embed a GPU card Tesla.  Its OS is Linux. The Tesla embed 250 cores at 1,1 GHz
  • lms-servhp : An HP Computer under Linux. It contains 2 Intel Xeon at 3,2 GHz. Cach memory by processor : 2Mo.  RAM : 8Go
  • lms-bigsave : A Transtec computer under Linux, bi-processor, 4 core Opteron, RAM : 16 Go.
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