BndLayer

Create a boundary layer mesh.

Syntax

model.mesh(<tag>).create(<ftag>,"BndLayer");

model.mesh(<tag>).feature(<ftag>).selection();

model.mesh(<tag>).feature(<ftag>).set(property,<value>);

model.mesh(<tag>).feature(<ftag>).getType(property);

model.mesh(<tag>).feature(<ftag>).create(<ftag1>,"BndLayerProp");

Description

Use model.mesh(<tag>).create(<ftag>,"BndLayer") to create a boundary layer mesh in 2D or 3D.

Use model.mesh(<tag>).feature(<ftag>).selection() to specify the domain selection. If you do not specify the selection, the feature operates on all domains.

Use model.mesh(<tag>).feature(<ftag>).create(<ftag1>,"BndLayerProp") to add a BndLayerProp attribute feature defining the locations and properties of the boundary layers.

The feature reads properties from the BndLayerProp attribute feature.

The following properties are available:

Table 4-10: Available Properties for BndLayer

Property	Value	Default	Description
continue	on | off	on	When enabled, the mesher does not stop if there is an error
sharpcorners	none | split | trim	split	Specifies the handling of sharp corners in 2D and sharp edges in 3D.
splitangle	double	240[deg]	Minimum angle between boundary layer boundaries to introduce a boundary layer split.
splitdivangle	double	100[deg]	Maximum angle per split
trimmaxangle	double	50[deg]	Maximum angle between boundary layer boundaries for boundary layer trimming.
trimminangle	double	240[deg]	Minimum angle between boundary layer boundaries for boundary layer trimming.
layerdec	integer	2	Maximum difference in number of boundary layers between neighboring points on boundary layer boundaries.
smoothtransition	on | off	on	Specifies if the operation smooths the transition to interior mesh.
smoothmaxiter	integer	8 in 2D, 4 in 3D	Specifies the number of smoothing iterations.
smoothmaxdepth	integer	16 in 2D, 6 in 3D	Specifies the maximum element smoothing depth.

Compatibility

The following properties from the corresponding COMSOL Multiphysics 3.5a command, meshbndlayer, have been removed:

Table 4-11: Removed Properties

Property	Reason
blbnd	Defined by the selection of BndLayerProp
hauto	Input mesh provided by meshing sequence
mcase	Defined by meshing sequence
meshstart	Input mesh provided by meshing sequence
out	Output mesh provided by meshing sequence
subdomain	Defined by the selection

Examples

Insert boundary layers to an existing mesh containing both quadrilateral elements and triangular elements.

Code for use with Java

Model model = ModelUtil.create("Model");

GeomSequence g = model.geom().create("geom1", 2);

MeshSequence m = model.mesh().create("mesh1", "geom1");

 

g.create("sq1", "Square");

g.create("sq2", "Square");

g.feature("sq2").setIndex("pos", "1", 0);

g.create("c1", "Circle");

g.feature("c1").set("r", "0.2");

g.feature("c1").setIndex("pos", "1.5", 0);

g.feature("c1").setIndex("pos", "0.5", 1);

g.create("co1", "Compose");

g.feature("co1").selection("input").init().set(new String[]{"c1", "sq1", "sq2"});

g.feature("co1").set("formula", "sq1+sq2-c1");

g.run();

 

m.create("map1", "Map");

m.feature("map1").selection().geom("geom1", 2);

m.feature("map1").selection().set(new int[]{1});

m.create("ftri1", "FreeTri");

m.create("bl1", "BndLayer");

m.feature("bl1").create("blp", "BndLayerProp");

m.feature("bl1").feature("blp").selection().set(new int[]{2, 3, 5, 6, 8, 9, 10, 11});

m.run();

Code for use with MATLAB

model = ModelUtil.create('Model');

g = model.geom.create('geom1', 2);

m = model.mesh.create('mesh1', 'geom1');

 

g.create('sq1', 'Square');

g.create('sq2', 'Square');

g.feature('sq2').setIndex('pos', '1', 0);

g.create('c1', 'Circle');

g.feature('c1').set('r', '0.2');

g.feature('c1').setIndex('pos', '1.5', 0);

g.feature('c1').setIndex('pos', '0.5', 1);

g.create('co1', 'Compose');

g.feature('co1').selection('input').init.set({'c1', 'sq1', 'sq2'});

g.feature('co1').set('formula', 'sq1+sq2-c1');

g.run;

 

m.create('map1', 'Map');

m.feature('map1').selection.geom('geom1', 2);

m.feature('map1').selection.set(1);

m.create('ftri1', 'FreeTri');

m.create('bl1', 'BndLayer');

m.feature('bl1').create('blp', 'BndLayerProp');

m.feature('bl1').feature('blp').selection.set([2, 3, 5, 6, 8, 9, 10, 11]);

m.run;

Create a boundary layer mesh consisting of prism elements along the boundary layer boundaries and tetrahedral elements in the interior:

Code for use with Java

Model model = ModelUtil.create("Model");

GeomSequence g = model.geom().create("geom1", 3);

MeshSequence m = model.mesh().create("mesh1", "geom1");

 

g.create("blk1", "Block");

g.feature("blk1").setIndex("size", "10", 0);

g.feature("blk1").setIndex("size", "5", 1);

g.feature("blk1").setIndex("size", "5", 2);

g.create("sph1", "Sphere");

g.feature("sph1").setIndex("pos", "3", 0);

g.feature("sph1").setIndex("pos", "2.5", 1);

g.feature("sph1").setIndex("pos", "2.5", 2);

g.create("dif1", "Difference");

g.feature("dif1").selection("input").init().set(new String[]{"blk1"});

g.feature("dif1").selection("input2").init().set(new String[]{"sph1"});

g.run();

 

m.create("ftet1", "FreeTet");

m.create("bl1", "BndLayer");

m.feature("bl1").create("blp", "BndLayerProp");

m.feature("bl1").feature("blp").selection().

set(new int[]{2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13});

m.run();

Code for use with MATLAB

model = ModelUtil.create('Model');

g = model.geom.create('geom1', 3);

m = model.mesh.create('mesh1', 'geom1');

 

g.create('blk1', 'Block');

g.feature('blk1').setIndex('size', '10', 0);

g.feature('blk1').setIndex('size', '5', 1);

g.feature('blk1').setIndex('size', '5', 2);

g.create('sph1', 'Sphere');

g.feature('sph1').setIndex('pos', '3', 0);

g.feature('sph1').setIndex('pos', '2.5', 1);

g.feature('sph1').setIndex('pos', '2.5', 2);

g.create('dif1', 'Difference');

g.feature('dif1').selection('input').init.set({'blk1'});

g.feature('dif1').selection('input2').init.set({'sph1'});

g.run;

 

m.create('ftet1', 'FreeTet');

m.create('bl1', 'BndLayer');

m.feature('bl1').create('blp', 'BndLayerProp');

m.feature('bl1').feature('blp').selection.set(2:13);

m.run;

See Also

BndLayerProp, Map, Sweep