Model.acousticmeshcreate

Model.acousticmeshcreate(fixed_nodes_collection, mesh_type, max_structural_cavities, min_jacobian, min_tet_collapse, create_comp_collection, create_cavity_faces, reserved1, reserved2)

Options are available for creating the mesh using specified type and quality parameters, to create face elements, to input fixed nodes within the cavities and optionally to only create a mesh for particular AC_Structural.N components. The AC_Structural.N naming convention is used to separate each cavity by placing them in components of different names, where N ranges from 1 to the number of structural cavities found.

This function can be run multiple times after running Model.acousticmeshinit() a single time. Each time Model.acousticmeshcreate() is run, it automatically deletes any existing AC_Structural.N and AC_Seat.M components. Note that a similar naming convention is used for seat cavities, AC_Seat.M. In order to avoid memory leaks, the Model.acousticmeshend() function should be called when the acoustic cavity mesh process is complete.

Parameters:

• fixed_nodes_collection (Collection) – The collection containing the fixed nodes. An empty collection can be used if there are no fixed nodes specified.

• mesh_type (int) –

  The type of mesh. Valid values are:

  0 - Preview mesh

  13 - For all-tetrahedral

  14 - For hexa-tetrahedral, non-conforming

• max_structural_cavities (int) –

  A flag used to denote the number of cavities for which to output elements. Valid values are:

  0 - All

  \(\gt\) 0 - The number of largest cavities found.

  \(\lt\) 0 - Those above this (positive) percent of largest cavities found.

• min_jacobian (double) – The minimum Jacobian for any hexa elements created. It is measured at the corner nodes of the elements.

• min_tet_collapse (double) – The minimum tet-collapse for any tetrahedral elements created.

• create_comp_collection (Collection) – The collection containing the entities. These (entities) components are those with the AC_Structural.N naming convention.

• create_cavity_faces (int) – Create faces for any solid-meshed cavities. These elements are placed in the ^cavity_faces component.

• reserved1 (int) – Reserved for future use. Must be specified as 0.

• reserved2 (double) – Reserved for future use. Must be specified as 0.

Examples

Produce an acoustic cavity mesh preview of the 10 largest cavities

import hm
import hm.entities as ent

model = hm.Model()

model.acousticmeshcreate(
  fixed_nodes_collection=hm.Collection(model, ent.Node, populate=False),
  mesh_type=0,
  max_structural_cavities=10,
  min_jacobian=0.0,
  min_tet_collapse=0.0,
  create_comp_collection=hm.Collection(model, ent.Component, populate=False),
  create_cavity_faces=0,
  reserved1=0,
  reserved2=0,
)

Produce an acoustic cavity mesh hexa - tetrahedral mesh of the 10 largest cavities . There are fixed nodes and cavities to output . Also , the output of cavity faces is enabled . There are also minimum acceptable Jacobian and tet - collapse values specified ( 0.2 and 0.1 , respectively )

import hm
import hm.entities as ent

model = hm.Model()

# Take as fixed nodes all nodes from 1-10
fixedNodeCol = hm.Collection(model,ent.Node,list(range(1,11)))

# Create an empty Node collection for the output
outputCol = hm.Collection(model,ent.Node,populate=False)

model.acousticmeshcreate(
    fixed_nodes_collection=fixedNodeCol,
    mesh_type=14,
    max_structural_cavities=10,
    min_jacobian=0.2,
    min_tet_collapse=0.1,
    create_comp_collection=outputCol,
    create_cavity_faces=1,
    reserved1=0,
    reserved2=0,
)