3D Mesh Preparation and Quality Control

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Questions and Answers

What is the process of finding and removing unnecessary free edges in a 3D mesh called?

Mesh Cleanup (correct)

Mesh Preparation

Mesh Quality Assessment

Mesh Editing

Which color represents bounding faces in solid geometry?

Blue

Green (correct)

Yellow

Red

What type of faces are shared between connected solids and depicted in yellow?

Fixed Faces

Partition Faces (correct)

Shared Faces

Bounding Faces

What should be adjusted during mesh preparation particularly for interactive processes?

Mesh Details Signup and view all the answers

Which operation helps to correct areas with low mesh quality?

Morphing Signup and view all the answers

What action is taken after running a mesh to ensure quality?

Review Element Quality Signup and view all the answers

What are edges that belong to two adjacent faces of a single solid called?

Shared Edges Signup and view all the answers

What should be done to unexpected holes in a 3D mesh?

Close the Holes Signup and view all the answers

What must be adjusted in the microdialog to create a hex mesh along the element normal?

Thickness value Signup and view all the answers

Which property indicates whether a solid can be meshed using the map tool?

Mappability Signup and view all the answers

What color indicates a solid that is not mappable?

Orange Signup and view all the answers

Which shape is required for the Map tool to function properly?

Solid geometry of mappable shapes Signup and view all the answers

What does it mean if a solid is mappable in one direction?

It can only be meshed in a single dimension. Signup and view all the answers

What will prevent a solid from being classified as mappable?

Multiple surfaces on the destination face Signup and view all the answers

Which step is unnecessary for the Tetra meshing process in HyperMesh?

Generate a shell mesh Signup and view all the answers

Which situation indicates that not all solids can be meshed at once?

When all solids are mappable but complex Signup and view all the answers

What causes a solid to be classified as not mappable?

Shared edges perpendicular to the drag direction Signup and view all the answers

Which feature is essential for generating a tetrahedral mesh from geometry?

Proper element connectivity Signup and view all the answers

What characteristic should a 2D mesh have to be suitable for tetrahedral meshing?

It must be non-overlapping Signup and view all the answers

How can the quality of a tetrahedral mesh be improved after its creation?

Performing mesh smoothing Signup and view all the answers

Which process is not part of the typical workflow for tetrahedral meshing?

Running computational tests Signup and view all the answers

What is a primary consideration when creating geometry for tetrahedral meshing?

The geometry should be watertight Signup and view all the answers

Which element type is generally not used in the Tetra meshing process?

Hexahedral elements Signup and view all the answers

In improving mesh quality, which criterion is often prioritized?

Balancing mesh size and shape Signup and view all the answers

What is required for hex meshing to occur?

An existing 2D mesh Signup and view all the answers

In the context of hex meshing, what is referred to as the 'drag direction'?

The vector from the source face to the target face Signup and view all the answers

Which of the following roles do Guide faces serve in hex meshing?

Faces that connect the source and target faces Signup and view all the answers

What action is optional when creating a hex mesh in HyperMesh?

Equivalence of elements in the solidmap component Signup and view all the answers

Which toolbar is used to access the hex meshing features in HyperMesh?

3D ribbon Signup and view all the answers

When creating a mesh of solid elements, what is the first step?

Select surfaces, elements, or faces as source/target Signup and view all the answers

What type of mesh can be created using the Map tool in HyperMesh?

3D meshes on mappable solids Signup and view all the answers

What does the term 'equivalence' refer to in the context of hex meshing?

Ensuring elements in the solidmap component are unified Signup and view all the answers

What is the primary purpose of 1D meshing in HyperMesh?

To accurately test connectors like bolts and rods in FEA Signup and view all the answers

What additional value do 2.0D elements incorporate compared to 1D elements?

Mesh nodes with an additional scalar value Signup and view all the answers

In which application would you likely use beam sections for modeling?

Designing structural joints in automotive engineering Signup and view all the answers

Which feature allows users to review cross-sectional values of beam sections in HyperMesh?

Contour plots Signup and view all the answers

What do the 'Align, Orient, and Offset' features relate to in HyperMesh?

Adjusting 1D element configurations Signup and view all the answers

What functionality can be accessed under the Beam Mesh group in HyperMesh?

Editing and reviewing beam properties Signup and view all the answers

Which of the following best describes beam sections in HyperMesh?

They store configurations of 1D beam cross-sections. Signup and view all the answers

What aspect of beam models can be reviewed when using the Edit Beam feature?

Moments of inertia and stiffness Signup and view all the answers

What is the purpose of RBE3 elements in the context of connector creation?

To connect multiple nodes into a single node Signup and view all the answers

Which connector type needs to be created after RBE3 elements in the connector creation process?

Point Connectors Signup and view all the answers

In the model setup for channel analysis, what material property is assigned to the Bracket?

T=2 and E=7.0e4 Signup and view all the answers

What is the purpose of creating sliding contacts between components in analysis setups?

To allow relative motion between parts Signup and view all the answers

Which step follows the creation of load collectors in the model setup process?

Creation of constraints Signup and view all the answers

What is a key benefit of validating and checking the model before running solver analysis?

To ensure the model meets required specifications Signup and view all the answers

What material property parameters are used for steel in the model build?

T=3, E=2.1e5, nu=0.3 Signup and view all the answers

In the context of model ribbon functions, what does 'Run' specifically enable users to do?

Open the Altair Compute Console Signup and view all the answers

Study Notes

HYPERMESH FOR PRE-PROCESSING V2023 AGENDA

The agenda covers HyperMesh for pre-processing, version 2023.

SESSION 4: 3D AND 1D MESHING

The session covers 3D and 1D meshing techniques.
3D Mesh Generalities (20m): Introduces basic 3D mesh concepts.
Tetra Mesh (70m): Covers tetrahedral meshing methods.
Hexa Mesh (120m): Discusses techniques for hexahedral meshing.
Beam Modeling (180m): Details the methods for creating 1D beam models.

3D MESHING OVERVIEW

Volume meshing (solid meshing) utilizes 3D elements to model solid objects.
Solid meshing is suitable for parts with significant thickness and surface variation.

CAPABILITIES

Volume Mesh: A multi-threaded, fast volume mesher for structural and CFD applications.
Layered Meshing: Enables the creation of layered meshes.
Hexa Mesh: A general interactive solid hexahedral meshing capability.
Mesh Controls: Facilitates hex dominant and hex meshing, as well as mesh control for automation.

3D MESHING STRATEGY OVERVIEW

Geometry cleanup step involves identifying and removing unnecessary free edges.
Geometry preparation includes defining washers and removing other unnecessary elements (logos, etc).
Meshing step involves defining a target mesh, running the mesh, and adjusting it to achieve specific results.
3D mesh quality and editing involve reviewing the element quality to correct low-quality areas.

GEOMETRY ENTITIES

Solid Faces (surfaces):
- Bounding faces (green): Belong to one solid object.
- Partition faces (yellow): Shared between multiple connected solids.
Fixed Points: Located at the ends of edges.
Edges: Lines either shared by two adjacent faces of a single solid (green) or non-manifold (yellow).
Non-manifold edges: Located between partition faces and two or more surfaces.

QUESTIONS & ANSWERS

Q1: What does it mean when you see yellow faces in your solid model?
- d) Two solid faces are stitched together.

SUPPORTED 3D ELEMENTS

Tetra Elements:
- Tetra4 (Configuration 204): 1st-order tetrahedra with 4 nodes.
- Tetra10 (Configuration 210): 2nd-order tetrahedra with 10 nodes.
Penta Elements:
- Penta6 (Configuration 206): 1st-order prism elements with 6 nodes.
- Penta15 (Configuration 215): 2nd-order prism elements with 15 nodes.
Hexa Elements:
- Hexa8 (Configuration 208): 1st-order hexahedra with 8 nodes.
- Hexa20 (Configuration 220): 2nd-order hexahedra with 20 nodes.

EXERCISE 09 - TETRA MESHING

Steps involve opening the model, fixing topology, creating tetra mesh, performing defeaturing operations, and detecting features.

EXERCISE 10 - CREATE A MAPPABLE SOLID

Steps include opening the model and defecturing the solid, splitting the solid using planes and lines, and creating solid mesh.

1D MESHING OVERVIEW

1D meshing is appropriate for analyzing connectors or components shaped like lines.
2D elements form the foundation for 1D elements.
1D elements are essentially mesh nodes.
Beam Sections (1D components) store, generate, and visualize 1D beam and cross-sectional data

BEAM MODELING APPLICATIONS

Beam modeling is used in various contexts, including automotive, ship building, aircraft, and civil engineering.
Specific elements modeled using this method are joints, panels, stiffener beams, columns, and nodes.

RIGIDS AND CONNECTORS

RBE2 (One-to-many): A rigid link where the motion of an independent node defines the motion of the dependent nodes. RBE2s add stiffness.
RBE3 (Many-to-one): The dependent node motion is a weighted average of the independent nodes' motion, and does not add stiffness.

CONNECTORS

Connectors define how parts are joined and facilitate rapid FEA (Finite Element Analysis) process realizations.

CONNECTOR STATES

Unrealized: No FE representation.
Realized: Successful FE representation.
Modified: The connector's values have changed after realization.
Failed: Unable to create a FE representation.

CREATE AND REALIZE CONNECTORS

The process involves utilizing tools for creating point, line, and area connectors.

SETUP VALIDATION & RUN

This is the final phase involving model setup, validating the model, and running the analysis.

EXERCISE 12 - CHANNEL ANALYSIS SETUP AND RUN

Focuses on model building, material and property setup, connector realization, and boundary condition setup, before running the solver.

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Description

This quiz explores essential concepts in 3D mesh preparation, including identifying and removing unnecessary edges, understanding face representations, and ensuring mesh quality. Test your knowledge on the procedures and adjustments required for effective 3D modeling.