Bilinear quadrilateral element

The bilinear quadrilateral element, also known as the Q4 element,[1] is a type of element used in finite element analysis which is used to approximate in a 2D domain the exact solution to a given differential equation.

The element consists of a combination of two sets of Lagrange polynomials, each one used to define the variation of a field in each orthogonal direction of the local referential.

## References

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1. ^ Zienkiewicz, O. C. (2000). The Finite Element Method Volume 1: The Basis (5th ed.).

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