FixZ Constraint

The fixZ constraint is a coordinate-based constraint that applies constraints to all nodes located at a specific Z-coordinate.

Description

The fixZ constraint targets nodes based on their Z-coordinate position. This is particularly useful for applying boundary conditions to an entire horizontal plane of nodes, such as the base or top of a model, without needing to specify each node individually.

Parameters

zCoordinate (float): The z-coordinate of nodes to be constrained
dofs (List[int]): List of DOF constraint values (0 or 1) * 0 = unconstrained (free) * 1 = constrained (fixed)
tol (float, optional): Tolerance for coordinate comparison (default: 1e-10)

Usage

import femora as fm

# Create Femora instance


# First assemble the mesh
fm.assembler.Assemble(merge_points=True)

# Fix all nodes at Z=0 (typically the base of a model)
# Fix all translations but allow rotations
fm.constraint.sp.fixZ(zCoordinate=0.0, dofs=[1, 1, 1, 0, 0, 0])

# Fix only vertical movement for nodes at Z=10.0 (top surface)
fm.constraint.sp.fixZ(zCoordinate=10.0, dofs=[0, 0, 1, 0, 0, 0], tol=1e-6)