Indices of curves in the geometric model for which a boundary layer is needed Threshold angle for creating a mesh fan in the boundary layer Minimum mesh size in the direction tangeant to the closest curve. Minimum mesh size in the direction normal to the closest curve. Maximum mesh size in the direction tangeant to the closest curve. Maximum mesh size in the direction normal to the closest curve. Minimum distance, bellow this distance from the curves, prescribe the minimum mesh sizes. Maxmium distance, above this distance from the curves, prescribe the maximum mesh sizes. Then the mesh size can be specified independently in the direction normal to the curve and in the direction parallel to the curve (Each curve is replaced by NNodesByEdge equidistant nodes and the distance from those nodes is computed.) Number of nodes used to discretized each curveĬompute the distance from the nearest curve in a list. It might (read: will probably) give wrong results for complex surfaces) Indices of surfaces in the geometric model (Warning, this feature is still experimental. It can also be used to compute the distance from curves, in which case each curve is replaced by NNodesByEdge equidistant nodes and the distance from those nodes is computed.

Here is the list of all available fields with their associated options:Ĭompute the distance from the nearest node in a list. Several field, use the Min or Max field (see below). Only one background field can be given if you want to combine Select the expression-th field as the one used to compute element Set the option string of the expression-th field. string = char-expression | expression | expression-list The newĬreate a new field (with id number expression), of typeįield. Identification numbers are listed in expression-list. Modify the prescribed mesh element size of the points whose Here are the mesh commands that are related to the specification ofĬharacteristic Length = expression Mesh.CharacteristicLengthMin, Mesh.CharacteristicLengthMaxĪnd Mesh.CharacteristicLengthFactor options (see section Mesh options list) The three aforementioned methods can be used simultaneously, in whichĬase the smallest element size is selected at any given point.Īll element sizes are further constrained by the The list of available fields with their options is given below. Geometry points and lines specified by an Attractor field.Ī MathEval field specifies the size of the mesh using an explicitĪ Min field specifies the size as the minimum of the sizesįields are supported by all the algorithms except those based on The GUI by selecting ‘Apply as background mesh’ in the post-processingĪ Box field specifies the size of the elements inside and outsideĪ Threshold field specifies the size of the mesh according to theĭistance to some geometrical entities. Line using the -bgm option (see section Command-line options), or in (Note that you can also load a background mesh directly from the command Used, since the mesh used to define the field will be destroyed during pos’) filesĬan currently be used as background meshes (‘. Mesh (usually through an error estimation procedure, in an iterative This method is very general but it requires aįirst (usually rough) mesh and a way to compute the target sizes on this

Various fieldsĪ PostView field specifies an explicit background mesh in theįorm of a scalar post-processing view (see Post-processing commands, and File formats) in which the nodal values are the Not by default), the mesh will be adapted with respect to the curvatureįinally, you can specify general mesh size “fields”. Second, if Mesh.CharacteristicLengthFromCurvature is set (it is Transfinite and extruded grids: see Structured grids). The final element sizes are of course constrained by the structuredĪlgorithms for which the element sizes are explicitly specified (e.g., This method works with all the algorithms implemented in the mesh In order to get the desired element sizes. So that you may have to add “dummy” geometrical entities in the model This might sometimes lead to over-refinement in some areas,

Linearly interpolating these values on the initial mesh (see The size of the mesh elements will then be computed by Geometrical points of the model (with the Point command: see There are three ways to specify the size of the mesh elements for aįirst, if Mesh.CharacteristicLengthFromPoints is set (it is byĭefault), you can simply specify desired mesh element sizes at the

Gmsh mesh width