This wiki contains simple tutorial models designed to get you acquainted step by step with the concepts and the syntax of ONELAB models.
The list below gives the main new concepts introduced by each tutorial. Explanations are given as comments directly in the models files, which you can browse directly from the list. Useful tips for using the graphical user interface are also available.
You can download all the tutorials on your computer with the command:
git clone https://gitlab.onelab.info/doc/tutorials.git
Additional examples highlighting various physical models and numerical techniques are available here.
Warning: these tutorials require the very latest Gmsh and GetDP versions (the stable versions will not work): simply download the ONELAB bundle to get uptodate versions
ONELAB tutorial for Gmsh and GetDP
The following examples introduce new features gradually, starting with the Electrostatic microstrip line model. Make sure to read the model files: each new feature is explained directly where it is used in the form of inline comments. (See also the ONELAB syntax guide for Gmsh and GetDP.)
 Physical regions and Abstract regions
 Stiffness term of a Laplacian problem
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 Righthandside term of a Poisson problem
 ONELAB variables
 Boundary conditions at infinity
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\nabla u
GetDP specific formulation for linear elasticity  First and second order elements
 Triangular and quadrangular elements
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 Global quantities and their special shape functions
 Computation of the energy dual, i.e. of the armature charge of the electrode
 More on ONELAB parameters (flags, model options, check boxes, menus, ...)
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 Contact thermal resistance (idealised thin region with hign thermal conductivity)
 Thermal electrode (floating temperature in a region of high thermal conductivity)
 Computation of heat flux through surfaces
 Import of a source field from a file
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 Potential flow, irrotational flow
 Multivalued scalar field
 Lift and Magnus effect, stagnation points
 Runtime variables
 Elementary algorithms in the Resolution section
 Nonlinear iteration to achieve Kutta's condition
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 Eddy current problems in frequency and timedomain
 Complexvalued solutions (phasors)
 Use of a template library containing generic formulations
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 Coupling of finite elements and electric circuits
 Definition of lumped circuit elements
 Creation of netlists combining lumped elements and global finite element quantities
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3D Magnetostatics and magnetic rigidbody forces
 3D Magnetostatics
 Dual vector and scalar magnetic potentials formulations
 Boundary condition at infinity with infinite elements
 Maxwell stress tensor and rigidbody magnetic forces
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ONELAB tutorial for Python
(See also the ONELAB syntax guide for Python.)
 Python ONELAB client
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ONELAB tutorial for C++
 C++ ONELAB client
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