RelDisp

Relative Displacement

In the governing equation,

$$\mathbf{K\cdot\Delta{}U=R},$$

this converger tests the following ratio,

$$\mathbf{\dfrac{\left|\Delta{}U\right|_\infty}{\left|U\right|_\infty}}\leqslant{}tol.$$

where $\mathbf{\Delta{}U}$ denotes the displacement increment of the current sub-step and $\mathbf{U}$ denotes the total displacement of the system.