Use model.component(<ctag>).mesh(<tag>).create(<ftag>,"Size") to specify element size properties in the sequence. Use
model.component(<ctag>).mesh(<tag>).feature(<ftag>).create(<ftag1>,"Size") to specify element size properties for the feature
<ftag> that can be any of the types
Edge,
FreeQuad,
FreeTri,
FreeTet,
Map, or
Sweep.
Use model.component(<ctag>).mesh(<tag>).feature(<ftag>).selection() or
model.component(<ctag>).mesh(<tag>).feature(<ftag>).feature(<ftag1>).selection() to specify the geometric entity selection. If you do not specify any selection the size feature is defined on all geometric entities. The selection is not available for the
default size feature, tagged
size.
The property table specifies the physics for which the element size is calibrated.
Hauto is a positive scalar. This value is used to set several mesh parameters in order to get a mesh of desired size. Smaller values of
hauto generate finer meshes with more elements. The integers between 1 and 9 has a special interpretation; they correspond to the mesh settings
Normal,
Fine,
Coarse, and so forth in COMSOL Multiphysics. The value 5 correspond to
Normal. When you set the property
hauto, all other properties are set to their default value, according to the following tables (for
table set to
default). Other noninteger values provide mesh parameters that are interpolated from the values in the tables.
The property hcurve is a real value that relates the mesh size to the curvature of the geometry boundaries. The Gaussian radius of curvature is multiplied by the
hcurve factor to obtain the mesh size along the boundary. The specified
hcurve is only used if
hcurveactive is
on, otherwise
hcurve is taken from a preceding size feature in the sequence. In the default size feature, tagged
size,
hcurve is always active and there is no
hcurveactive property.
The property hgrad tells how fast the element size — measured as the length of the longest edge of the element — can grow from a region with small elements to a region with larger elements. If two elements lie one unit length apart, the difference in element size can be at most
hgrad. The specified
hgrad is only used if
hgradactive is
on, otherwise
hgrad is taken from a preceding size feature in the sequence. In the default size feature,
hgrad is always active and there is no
hcurvegrad property.
The hmax parameter controls the size of the elements in the mesh. The algorithm aims at creating a mesh where no element size exceeds
hmax. The default
hmax value is
hmaxfact *
maxdist, where
maxdist is the longest axis parallel distance in the geometry. The specified
hmax is only used if
hmaxactive is
on, otherwise
hmax is taken from a preceding size feature in the sequence. In the default size feature,
hmax is always active and there is no
hmaxactive property.
You can use hmin to control the minimum size of the elements. The main purpose of this parameter is to prevent the generation of many small elements near small curved parts of the geometry. The default
hmin value is
hminfact *
maxdist, where
maxdist is the longest axis parallel distance in the geometry. The specified
hmin is only used if
hminactive is
on, otherwise
hmin is taken from a preceding size feature in the sequence. In the default size feature,
hmin is always active and there is no
hminactive property.
The hnarrow parameter controls the size of the elements in narrow regions. Increasing values of this property decrease the size of the elements in narrow regions. If the value of
hnarrow is less than one, elements that are anisotropic in size might be generated in narrow regions. The specified
hnarrow is only used if
hnarrowactive is
on, otherwise
hnarrow is taken from a preceding size feature in the sequence. In the default size feature,
hnarrow is always active and there is no
hnarrowactive property.
The values of hauto,
hcurve,
hgrad,
hmax,
hmin, and
hnarrow are positive real scalars, or strings that evaluate to positive real scalars, given the evaluation context provided by
model.param().
