The rigid-plastic flow analysis is a solution approach to large deformation analysis, which is well suited for simulation of high temperature metal forming. Two formulations are available: an Eulerian (steady state) and Lagrangian (transient) approach. The effects of elasticity are not included. If these effects are important, this approach should not be employed. However simulation of metal forming applications such as superplastic forming does not require inclusion of elasticity. In the steady state approach, the velocity field land stress field) is obtained as the solution of a steady-state flow analysis. The time period is considered as 1.0 and, hence, the velocity is equal to the deformation. In the transient formulation, the incremental displacement is calculated. This procedure needs to enforce the incompressibility condition, which is inherent to the strictly plastic type of material response being considered.