Ask-The-experts ANSYS Advanced Meshing

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    2010 ANSYS, Inc. All rights reserved. 1 ANSYS, Inc. Proprietary

    2010 ANSYS, Inc. All rights reserved. 1 ANSYS, Inc. Proprietary

    Advanced Meshingin ANSYSMechanical

    Govindan Nagappan

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    umm ry

    Meshing FrameworkImprovements

    Direct meshing

    Parameter handling

    Improved Virtual Topologies

    Mesh-based Connections

    Improved Named Selections

    Mesh Controls

    Advanced Size Function

    Body of Influence

    Mesh Based Defeaturing

    Improved Mapped Meshing

    Pinch Control

    Mesh Methods

    Improvements in Shell meshing

    Improvements in Hex meshing

    Sweep

    MultiZone meshing

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    Direct Meshing

    ANSYS Workbench meshing has been focused onautomated meshing:

    Software automates choice of methods, physicsdefaults and controls

    Interaction between methods is automated

    At 13.0, the user has greater access to directlymesh bodies of multibody parts:

    This provides more flexibility and control over themeshing process

    Control the meshing sequence

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    Direct Meshing

    Direct Meshing advantages: Bodies can be meshed individually

    Mesh seeding from meshed bodies influence

    neighbors (user has sequence control)

    Automated meshing can be used at any time to

    finish rest of meshing (control where you want it

    while keeping the automation)

    When controls are added, only affected bodymeshes go out of date

    More extensive mesh method interoperability

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    Direct Meshing: Local Meshing

    Individual bodies can be meshed (no need forsuppression as in 12.1)

    Subsequent bodies use the attached face mesh

    Direct Meshing allows for more combinations of how to handle the

    common interface between bodies

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    Direct Meshing: Local Remeshing

    Automated meshing:

    Mesh methods and orderdefined automatically

    Good starting mesh

    Direct meshing: On inspection, would like

    more mesh in some spots:

    Add method, inflation or

    sizing control and upon

    Generate Mesh, only this

    body (and any affected

    bodies) are re-meshed

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    Direct Meshing: Selective Body

    Updating

    Similarly if only part of the geometry changes: Only affected bodies need

    to be updated/remeshed

    Significant time savings

    on model change

    Face Delete in DM

    Geometry Refreshonly 1 body is out of date

    Generate meshonly 1 body is meshed

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    Direct Meshing: State

    Management

    State management: The part/body tree willindicate which bodies need to be remeshed:State icons indicate status of bodies.

    When mesh controls are added you will

    notice that the state changes, even

    though the mesh remains visible.

    Body meshes can be generated or

    cleared at body level.Generate mesh at mesh level will

    generate the mesh for all unmeshed

    bodies

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    Direct Meshing: Ordered Meshing

    Automated meshing

    Layer of tet

    mesh required

    as topology

    changes

    Direct meshing

    With Direct Meshing:

    Mesh thin sweep first,then mesh rest of model with

    Automated meshing

    Direct meshing complements the

    automated meshingThin Sweep Mesh Method can handle this, but the

    order the mesh is generated in is critical

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    Parameterization in ANSYS

    Meshing

    Meshing controls can now be parameterized

    Global controls and local controls Selection of parameter promotes the parameter to the WB project page

    Geometry and Meshing parameters can be related using expressions in the parametermanager

    New in AM 13.0!

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    Parameterization Project Example

    Number of divisionson the outlet pipe

    equal to two times its

    length

    Number of divisons

    on the inlet pipe equal

    to its length + 4

    8+4=12d

    ivisions

    Inlet

    Outlet

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    Parameterization Project Example

    (Cont)

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    When to use?

    To merge together a number of small (connected) faces/edges To simplify small features in the model

    To simplify load abstraction for mechanical analysis

    To create edge splits for better control of the surface mesh control New in AM13.0!

    Virtual cell modifies the topology

    Original CAD model remains unchanged New faceted geometry is created with

    virtual topology

    Virtual Topology

    Without VT With VT

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    Edge Splits to Guide Meshing

    VT edge splitsavailable to help

    guide meshing:

    Edge splits introduced to

    constrain the mapped mesh

    Difficult to get a good mesh

    with complex wavy curves

    Mesh is improved

    Edge splits can be further

    moved interactively

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    Mesh connections

    For sheet models, connections can be defined asMesh connections

    Options include similar options as other connections

    Mesh connections will be created at mesh time (rather

    than as CE in solver)

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    Mesh Connections

    Create Automatic Connections Automatic connections are created

    Displays result from

    mesh connections

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    Mesh Connections

    After meshing, user can also look at mesh connectivity

    Automatic connections are created

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    Named Selections

    Named Selections allow users to assign aname to one or more selected entities in DMor AM

    The Named Selections used in DM can betransferred to AM by allowing in the Workbenchoptions (Tools/Options/Geometry Import) beforeopen a DM session

    All entities within a Named Selection must be ofthe same topology

    Easy to reselect groups that will be referencedoften

    Named selections are automatically exported tosolver modules

    Named Selections can be applied to the entitiesof the same size, type or location, by usingnew selection options New in AM 13!. See the

    Appendix at the end for details

    Named Selection groups can be imported from DesignModeler

    and other CAD systems

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    Enhanced - Named Selections

    New option to define selection by worksheet

    Worksheet allows set of actions to build up anamed selection based on a criteria(size,

    location, type, coordinate system, convert etc.

    Able to quickly define criteria whencreating from Graphics Window

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    Named Selections

    Named Selections can be applied to selected geometries Named Selections can be applied to a set of entities of thesame size, location or type by using the filterApply geometry

    items of same

    804 faces selected in

    one click!New in AM13!

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    Sizing : Advanced Sizing Function

    ASF : Off

    Only edge sizes are

    determined based on

    curvature and are

    controlled by the span

    angle center Rest of the mesh is

    generated with global

    element size

    Curvature or proximity is

    not considered for face

    and volume meshing

    ASF : Curvature