Douglas N. Arnold, Daniele Boffi, Richard S. Falk, Quadrilateral H (div) Finite Elements, SIAM Journal on Numerical Analysis, Vol. 42, No. 6 (2005), pp. 2429-2451 ...

By adding a term to the variational equations, we derive a new finite element method for the stationary Stokes equations which eliminates the div u= 0 restriction on the trial functions.

The most resounding example of this was the use of the FE method by the National Institute of Standards and Technology (NIST) during the research and studies into the collapse of the World Trade ...