Meshing Sequences

Using Meshing Sequences
COMSOL Multiphysics provides an interactive meshing environment where, with a few mouse clicks, you can easily mesh individual faces or domains. Each meshing operation is added to the meshing sequence. The final mesh is the result of building all the operations in the meshing sequence.

This example demonstrates how to use the meshing sequence to create a mesh consisting of different element types. You learn how to add, move, disable and delete mesh operations, and how to control the mesh using size features in the meshing sequence.
"Meshing sequences" are the ordered steps used to generate a computational mesh from a geometric model. In software like COMSOL, a meshing sequence is a list of operations and attributes, executed from top to bottom, that progressively builds the mesh. These sequences can be automatically generated based on a model's physics or can be manually customized for specific control over mesh element types, size, and distribution. The order of operations is crucial, as it can impact the final mesh and may lead to errors if an operation depends on a previous one that is changed.

Key components of a meshing sequence
Mesh Generator Node: This is the foundational node that specifies the element type (e.g., triangular, tetrahedral) to be used for the mesh.
Meshing Operations: These are the main steps in the sequence, such as "Free Tetrahedral" or "Swept Mesh," which define how the geometry is divided.
Attributes: These are sub-nodes that modify the mesh operations by adding local details. Common attributes include:
Size: Controls the size of the mesh elements. A finer mesh increases accuracy but also computational cost.
Size Expression: Allows for using a mathematical expression to define element size.
Distribution: Sets a specific number of elements along a certain direction, as explained in this YouTube video.
Corner Refinement: Automatically refines the mesh at sharp corners to improve accuracy, as seen in this Comsol blog post.
Boundary Layers: Adds layers of elements next to boundaries, often used in fluid dynamics simulations.
How meshing sequences work
Automatic or Manual Creation: The sequence can be created automatically by the software (a "physics-controlled" mesh) based on the model's physics, or it can be built manually by the user (a "user-controlled" mesh).
Top-Down Execution: The software executes the operations in the sequence from the top down, applying the operations and their associated attributes in order.
Attribute Precedence: If multiple attributes are applied to the same selection, the last one in the sequence takes precedence.
Order Dependency: The order is critical. If you move an operation, it may no longer work correctly if it relies on results from a previous operation that has been moved, potentially causing errors.
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