GMSH 2D STRUCTURED MESH TUTORIAL HOW TO
GMSH 2D STRUCTURED MESH TUTORIAL SOFTWARE

In this way, in general, physical regions are created which associate together geometrical regions, and then the related mesh elements, which share some common physical properties. Physical Names consist of strings enclosed between quotation marks. Physical Names are assigned to the Physical entities. The expression(s) inside the braces on the right hand side give the identification numbers of all the geometrical lines that need to be grouped inside the physical line. Definition of the physical entity Physical Line 'bulk' The two expressions inside the braces on the right hand side give the identification numbers of the start and end points of the line. Any other geometrical orientation could give impredictable results. N.B.: In a 1D simulation it is assumed that the geometrical model is restricted to the x axis. The size of the mesh elements will then be computed in GMSH by linearly interpolating these characteristic lengths in the whole mesh. Thus, the smaller is the value of d, the greater is the mesh density close to that point. In the definition of a geometrical point, the three first expressions inside the braces on the right hand side give the three X, Y and Z coordinates of the point the last expression ( d) sets the characteristic mesh length at that point, that is the size of a mesh element, defined as the length of the segment for a line segment, the radius of the circumscribed circle for a triangle and the radius of the circumscribed sphere for a tetrahedron. Definition of geometrical entities Points These are valid GMSH variables: L is just the length of the Si sample d is the value of a characteristic mesh length (see below). In a GMSH script, several variables can be defined and given a value in this way:

GMSH 2D STRUCTURED MESH TUTORIAL HOW TO

In the following we’ll see how to write a basic GMSH script (bulk.geo) for any details please refer to GMSH manual GMSH ( ).

Interactive, using the graphical interface.Here we will see in details the procedure for GMSH.

GMSH 2D STRUCTURED MESH TUTORIAL SOFTWARE

To do so, you can use DEVISE module of ISE-TCAD 9.5 software package or GMSH program. The mesh adaptation features are documented here.In this section we will see, step by step, how to use tiberCAD to simulate numerically a semiconductor device.Īs a very simple 1D example we will refer to the Example_0 (Si bulk) that you can find in the examples directory.Īs a first step, we have to model the device. This procedure was previously performed using external codes and the remeshing software Yams. Our implementation is actually restricted to the adaptation of plane-view 2D meshes comprised of linear 3-nodes triangular elements. The mesh adaptation is performed using the freely available library MMG (, Dapogny et al., 2014). Routines to compute the anisotropic metric defining the mesh size have been implemented as Elmer/Ice Solvers. Here, we use an error estimate based on the interpolation error, proposed by Frey and Alauzet (2005). The main difficulty is to find efficient and reliable estimators of the numerical error to control the mesh size. Adaptive mesh refinement (AMR) is a method where the accuracy of the solution is controlled by spatially adapting the mesh size. Having a fine mesh resolution everywhere in the model domain is often not computationnally affordable. close to the grounding line, to capture few-kms-width ice-streams in large-scale ice-sheet simulations etc…, see e.g. Many problems require to have a high mesh resolution in some particular locations (e.g.

Gmsh 2d structured mesh tutorial