Embed Size (px)
Citation preview
© 2015 CAE Associates
Combined Meshing Techniques in
ANSYS Workbench Presented by:
Eric Stamper 4/21/2015
2 www.caeai.com www.caeai.com
CAE Associates Inc.
Engineering Consulting Firm in Middlebury, CT specializing in FEA and CFD analysis.
ANSYS® Channel Partner since 1985 providing sales of the ANSYS® products, training and technical support.
3 www.caeai.com www.caeai.com
e-Learning Webinar Series
This presentation is part of a series of e-Learning webinars offered by CAE Associates.
You can view many of our previous e-Learning sessions either on our website or on the CAE Associates YouTube channel:
If you are a New York or New Jersey resident you can earn continuing
education credit for attending the full webinar and completing a survey which will be emailed to you after the presentation.
4 www.caeai.com www.caeai.com
CAEA Resource Library
Our Resource Library contains over 250 items including: — Consulting Case Studies — Conference and Seminar Presentations — Software demonstrations — Useful macros and scripts
The content is searchable and you can download copies of the material to review at your convenience.
5 www.caeai.com www.caeai.com
CAEA Engineering Advantage Blog
Our Engineering Advantage Blog offers weekly insights from our experienced technical staff.
6 www.caeai.com www.caeai.com
CAEA ANSYS® Training
Classes can be held at our Training Center at CAE Associates or on-site at your location.
CAE Associates is offering on-line training classes in 2015! Registration is available on our website.
7 www.caeai.com www.caeai.com
Agenda
Combined Workbench Meshing Overview — Handling mixtures of:
• Beams • Shells • Solids
Previous e-Learning:
CAE Associates has a 2-Day advanced ANSYS Workbench meshing class offered in our Middlebury, CT office.
We’re also offering a 4 hour online course that covers specialized meshing topics.
— Sign up if you’re interested!
https://caeai.com/resources/combining-different-mesh-types-workbench-ansys-e-learning
© 2015 CAE Associates
Conformal Meshing Options
9 www.caeai.com www.caeai.com
Shared Topology Summary
Solid Shell Beam
Solid Yes - -
Shell No1 Yes -
Beam No1 Yes2 Yes
1 – Shared topology not supported but can use “node merge” with v16.0 (to merge nodes on solid face, not within body)
2 – Potentially use Mesh Connections instead or Pinch
Nodes Merged
10 www.caeai.com www.caeai.com
Conformal Meshing Option #1
Geometry is connected at the CAD level in DesignModeler or SpaceClaim: — Option = Shared Topology
11 www.caeai.com www.caeai.com
Conformal Meshing Option #2
Mesh Connections: — Mesh connections use the concept of master and slave geometry to control
how the connection is made: • Master: indicates the geometry/topology onto which other geometry is projected. • Slave: indicates the geometry that will be projected onto the master geometry.
Connection options: — Faces (Master) to Edges (Slave) — Faces (Master) to Vertices (Slave)
Projection
Slave
Master
12 www.caeai.com www.caeai.com
Conformal Meshing Option #2
Independently meshed geometries are connected at the mesh level in Mechanical: — Mesh Connection (or Pinch):
13 www.caeai.com www.caeai.com
Conformal Meshing Option #3
Independently meshed geometries are connected at the mesh level in Mechanical: — Node Merge:
© 2015 CAE Associates
Conformal Mesh: Line Bodies
15 www.caeai.com www.caeai.com
Beam Modeling
DesignModeler: features in the Concept menu are used to create and modify “Line Bodies” which become FE beam models in Mechanical
— Details on the specifics of all DM features can be found in the help. SpaceClaim: can also be used to define beams, and cross sections and
directly extract beams from solid geometry.
Recommendation:
— Use Shared Topology to form a continuous mesh on all beams.
© 2015 CAE Associates
Conformal Mesh: Surface Bodies
17 www.caeai.com www.caeai.com
DM: Connectivity repair tools
DM: Automatic extensions — Quickly connect sheet models
Mechanical/Meshing: Mesh Connections / Pinch controls
— Cleanup of geometry can be manual, due to tolerances. Use mesh connections or pinch controls to quickly fine tune models
On closer inspection, gaps remain after surface extension. Use mesh connections or face pinch controls in mechanical with out having to properly intersect geometry.
18 www.caeai.com www.caeai.com
Mesh Connections
DM — All surfaces are formed into a part — Surface passes through others
(i.e. no edge at intersection).
Mechanical — Shared Topology splits
surfaces to form surface intersections (edge shown)
19 www.caeai.com www.caeai.com
Mesh Connections
In Mechanical — Even though all surfaces are formed into a part, not all surfaces are meshed
continuous — Visualized with “Single” edges
Non-conformal mesh, single edges
20 www.caeai.com www.caeai.com
Mesh Connections
Use automatic mesh connections to find and connect all necessary edges — Create a “Mesh Edit Group” with Type = “Mesh Connection”
— Set in the details the search tolerance and grouping options: • RMB Click > Detect Connections: they’ll be generated in the tree. • RMB Click > Connect Mesh: to generate the connections
21 www.caeai.com www.caeai.com
Mesh Connections
Use automatic mesh connections to connect all single edges — Display edges by connection — View mesh to verify connections
Connections occur post-mesh — E.g. the mesh is pinched in a separate step after meshing is complete
• Selective meshing also won’t show the connection until all meshing is complete
22 www.caeai.com www.caeai.com
Mesh Connections
Mesh connections can be viewed on the geometry with the option shown
© 2015 CAE Associates
Combining Beams and Shells
24 www.caeai.com www.caeai.com
DM: Beams and Shells Conformal Mesh
DM Shared Topology: — Vertices are merged connecting any
mixture of shell edges or beams.
— Use joints anytime you have edges which do not share coincident vertices (any mixture of beams and shells).
• Face to edge mesh connection would also work here.
Note that mesh connections cannot
be used to connect: — Vertices to edges — Edges to edges
25 www.caeai.com www.caeai.com
DM: Beams and Shells Conformal Mesh
Beams and Shells are meshed continuous when the following is performed in DM:
— Joint handling: • Tools > Joint • Select both surface(s) and line(s) to form joints (locations to be meshed continuous).
— Shared topology of line and surface bodies: • This will ensure proper topology sharing among beams and shells in Mechanical for
the “Joints” that have been defined.
Beam & Shell Geometry
Conformal Mesh
26 www.caeai.com www.caeai.com
DM: Beams and Shells Conformal Mesh
Example: — The 1 Line Body has 2 edges. — The 1 edge joint is created on only 1 edge of the line body and the surface
— Form shared topology between line and surface
— View > Edge Joints • This will display edge joints • The color will be RED with no shared topology • The color will be BLUE with shared topology
Joint
Joint
1 Line Body 2 Edges
27 www.caeai.com www.caeai.com
DM: Beams and Shells Conformal Mesh
Example: — Once the geometry is imported into mechanical, only the 1 edge of the line
body is meshed continuous with the edge of the surface.
1 shared edge (conformal mesh)
2 separate edges (independently meshed)
28 www.caeai.com www.caeai.com
Beams and Shells Conformal Mesh
A continuous mesh can be formed between the ends of beams and shells with a “Pinch” meshing control in Mechanical
— DM joints and shared topology do not connect beams ends to shell surfaces. • However; you can use: “Projection > Points On Face” to create coincident vertices
that Shared Topology will merge
29 www.caeai.com www.caeai.com
Mesh Connections
Mesh connections will work on topology that consists of: — Line or surface bodies but not solids
Mesh connection combinations: — Faces (Master) to Vertices (Slave) — Faces (Master) to Edges (Slave)
Face to vertices
Face to edges
30 www.caeai.com www.caeai.com
Mesh Connections
Mesh connect beams and shells
© 2015 CAE Associates
Solid and Shell Shared Topology
32 www.caeai.com www.caeai.com
Solids and Shells w/ Shared Topology
Forming shared topology with solids and surfaces in DM results in the following:
1. The solid geometry is sliced by the surface only at the intersections 2. The surface is not imported into Mechanical 3. A continuous mesh is formed between all the solids
Note: solid and line body shared topology is not supported.
33 www.caeai.com www.caeai.com
Node Merge
Node merge will work on topology that consists of: — Lines, surfaces or solids
Node merge combinations: — Vertex to vertex — Edges to edge — Edge to face — Face to face
Note: mesh should be constructed with nearly
coincident nodes as the node merge can cause poorly element shapes.
Edge to edge
Face to face
34 www.caeai.com www.caeai.com
THANK YOU!
Please visit us online at caeai.com
