ForcesAndSourcesCore.hpp File Reference

Implementation of elements on entities. More...

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Classes
struct	MoFEM::ForcesAndSourcesCore
	structure to get information from mofem into EntitiesFieldData More...
struct	MoFEM::ForcesAndSourcesCore::UserDataOperator
struct	MoFEM::OpLoopSide< E >
	Element used to execute operators on side of the element. More...
struct	MoFEM::OpLoopRange< E >
	Iterate over range of (sub)elements. More...

Namespaces
namespace	MoFEM
	implementation of Data Operators for Forces and Sources

Variables
DEPRECATED typedef ForcesAndSourcesCore	MoFEM::ForcesAndSurcesCore

Detailed Description

Implementation of elements on entities.

Generic finite element implementation using operator pipelines.

Those element are inherited by user to implement specific implementation of particular problem.

This file provides the core framework for finite element computations in MoFEM based on a pipeline of user data operators. Instead of monolithic finite element implementations, ForcesAndSourcesCore treats finite elements as sequences of modular operators that can be combined and reused.

Core Concept: Operator Pipeline Architecture

Finite Element = Pipeline of Operators Rather than traditional finite element classes with hardcoded functionality, MoFEM implements finite elements as pipelines of small, focused operators. Each operator performs a specific task (calculate gradients, apply boundary conditions, assemble matrices, etc.) and can be combined with others to create complex finite element behaviors.

ForcesAndSourcesCore: Generic base class that manages the operator pipeline and provides the framework for element assembly. Users inherit from this class and add specific operators to implement their particular problem.

Operator Types and Usage:

OPROW: Operators that work with test functions (rows of system matrix)

• Used for: Loading vectors, boundary conditions, source terms
• Example: Applying Neumann boundary conditions, body forces
• Operates during: Right-hand side vector assembly

OPCOL: Operators that work with trial functions (columns of system matrix)

• Used for: Geometric operations, coordinate transformations
• Example: Calculating coordinates, setting up geometry
• Operates during: Matrix structure setup and geometric computations

OPROWCOL: Operators that work with both test and trial functions

• Used for: Stiffness matrices, mass matrices, coupling terms
• Example: Linear elasticity stiffness, thermal conductivity
• Operates during: System matrix assembly (most common type)

OPSPACE: Operators that work on the finite element space itself

• Used for: Basis function transformations, coordinate mappings
• Example: Piola transforms for Hdiv/Hcurl spaces, Jacobian operations
• Operates during: Pre-processing before matrix/vector assembly

Usage Pattern:

1. Inherit from appropriate ForcesAndSourcesCore variant
2. Add operators to pipeline using getOpPtrVector()
3. Operators execute automatically during element assembly
4. Combine different operator types to implement complete finite element

Benefits:

• Modularity: Reuse operators across different finite element types
• Flexibility: Easy to modify behavior by adding/removing operators
• Maintainability: Small, focused operators are easier to debug
• Extensibility: Add new physics without modifying existing code

Note

This design enables rapid development of complex multiphysics finite element applications through operator composition.

Definition in file ForcesAndSourcesCore.hpp.