Tools for Multi-Physics Simulation
Hans Petter Langtangen
Simula Research Laboratory
Oslo, Norway
Department of Informatics,
University of Oslo
Present Simula projects
History of the group
Python
PythonC++
multi-physics
PDE components
F77
Future ideas/visions
Waterwaves
Heattransfer
StochasticPDEs
Other PDEapplications
Porous mediaflow
Aero-dynamics
Incompressibleflow
1990s: Diffpack & applications
Structuralmechanics
Field
Grid
MatrixVector
I/O
Ax=b
FEM
FDM
Class P1
Grid* grid;Field* p;LinEqAdm* Axb;
integrands (…);K(…);
A Typical Diffpack PDE Solver
Finite element grid
Finite element field
CbCAx
bAx
BiCGStab
CG MG
Linear equations and solvers
Evaluate integrands in weak formEvaluate variable coefficient
Diffpack distribution
• 1995 & 1997: Open source versions• 1997-2003: Numerical Objects• 2003-?: inuTech• Free test version (size limit)• Simula collaborators have free access• Customers include Cornell, Stanford,
LLNL, Intel, NASA, Shell, IFP, DaimlerCrysler, Mitsubishi, ...
• >200 customers in >30 countries
Some Diffpack features
• Linear solvers and preconditioners• Grids and scalar/vector fields• Biased towards FEM, support for FDM• Mixed FEM, block systems• Systems of PDEs• Stochastic PDEs• Multilevel solution• Adaptive mesh (h-adaptivity)• Parallel computing• Problem solving environment
Some Diffpack applications
• Heat and phase transfer• Viscous laminar and turbulent flow• Thermo-elastic-plastic deformation• Electromagnetics• Chemical reactors• Design of quantum computers• Stochastic porous media flow• Electrical activity in the heart• Tsunami simulation• ...
Simula is a new government lab for advanced ICT research
StartupJan 1, 2001
High quality research
Educate graduate university students
Prepare for research-
based business
Research groups were selected by competition
11 Applicants
Scientific Computing
Software Engineering
Networks and Distributed Systems
Simula emphasizes large projects
Software
for PDEs
Cardiac
Computing
Inverse
problemsComputational
geosciences
Computing the electrical activity in the heart
This is a computationally intensive problem
39 million unknowns
231 million elements
400-500 millions
of ODEs
42 million unknowns
252 million elements
Computational geosciences
• Goal: find more oil!• Compute geological evolution• Multi-resolution visualization• PDEs for deposition/erosion• Flow, heat, deformation• Software integration• Advanced tools for tracking
geological events
t
t
Offshore Geohazards –Tsunami generation
The Storegga Slide (8150 yrsBP)
Headwall 300 kmRun-out 800 kmVolume 5.600 km3
Area 34.000 km2
The Mjølnir asteroide impact
Barents Sea, 142 mill. years ago
The Mjølnir event was 1000 times stronger than the Dec 26, 2004 event!
The Mjølnir tsunami consisted of a series of individual waves
The evolution of the front of the tsunami
The Silent Wings soaring simulator uses advanced terrain visualization
FAMMS
Python
SWIG/F2PY
GiNaC C++/F77
SWIG
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