Any geometry that can be defined by its surcace geometry and thickness can be classified into 2D, There are certain characteristics of geometry we have to consider before converting into 2D

1. Having constant thickness

2. Thickness negligible w.r.t. area

3. Assumed no deformation in thickness during simulation

Given below are the examples of 2D simplified geometries

or

first order tria/tria3

or

first order quad/quad4

or

second order tria/tria6

or

second order quad/quad8

This is the ratio of the longest edge of an element to either its shortest edge or the shortest distance from a corner node to the opposing edge

An angle is formed by the two lines which pass through the midpoints of the sides of the quadrilateral. The skew angle represents the absolute value of the difference between the angle and 90 degree. A rectangle has the skew angle of 0 since the formed angle between lines is 90 degree.

This is the amount by which an element (or in the
case of solid elements, an element face)deviates from being
planar.

The quad is divided into two trias along its
diagonal, and the angle between the trias’ normals is

measured.

the Jacobian (also called Jacobian Ratio) is a measure of the deviation of a given element from an ideally shaped element. The jacobian value ranges from -1.0 to 1.0, where 1.0 represents a perfectly shaped element.

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