# Geometric defect: about

## Introduction

A geometric defect is a particular entity:

• is created by Flux using tools for geometry checking
• is corrected by Flux using tools for geometry healing

## Geometric defects

The geometric defects can be classified in:

• defects involving one geometric entity:
• abnormal face or face lower than automatic epsilon, a value (of surface) computed by Flux
• abnormal face or face lower than epsilon, a value (of surface) given by the user face
• abnormal line or line lower than automatic epsilon, a value (of length) computed by Flux
• abnormal line or line lower than epsilon, a value (of length) given by the user
• open wires
• defects involving two geometric entities:
• two superimposed entities: superimposed points, superimposed lines
• intersection of two entities: intersection of lines, intersection of lines and faces

The geometric defects identified by Flux are presented in details in the blocks below.

## Abnormal entities

The presence of the very small faces / lines does not block geometry building. On the other hand, the entities of small dimensions can affect the mesh quality. The user defines the value ε , the limit for the face / line becomes a defect for the meshing.

Geometric defect Why is this a defect?

Abnormal face:

where: ε is the value of surface computed by Flux

Geometry / mesh building is impossible.

Abnormal face (user epsilon):

where: ε is the value of surface given by the user

The mesh quality can be imperfect.

Abnormal line:

where: ε is the value of length computed by Flux

Geometry / mesh building is impossible.

Abnormal line (user epsilon):

where: ε is the value of length given by the user

The mesh quality can be imperfect.

## Open wire

The geometric data imported in the Flux project can present the openings on contours difficult to detect with the naked eye and which obstruct the later construction of the faces. The user decides if the face must be built or not.

Geometric defect Why is this a defect?

Open wire:

The opening on a contour is blocking for the face building.

## Two entities superimposed

The types of overlay of two entities presented in the table below are not authorized by the geometry building module and as a result are blocking for the construction of the faces.

Geometric defect Why is this a defect?
Superimposed points (distance between two points is lower than the absolute precision) Geometry building is impossible.

Superimposed lines:

• entirely:

• partially:

Geometry building is impossible.

## Intersection of two entities

The intersections of two entities presented in the table below are not authorized by the geometry building module and as a result blocking for the construction of the faces.

Geometric defect Why is this a defect?

Intersection of two lines:

• general case:

• particular case:

Geometry building is impossible.

Intersection of line and face

Geometry building is impossible.