## Research on Computational Mechanics for Unsteady Problems

### Ordinary Research

Akira TezukaC
Takeshi Suzuki

April,1996-March,1999
**Outline of the Project**

Numerical analysis for unsteady and nonlinear problems is widely
used in mechanical design. However, there are still some problems in the
stability, accuracy, and efficiency of calculation. In this research, new
techniques for analysis will be developed based on the statistical simulation
and the space-time FEM. The statistical simulation technique has advantages
that it does not need numerical grid which cause above-mentioned problems,
and can use Lagrangian model that is simpler than Eulerian model, e.g.
Finite Deferential Method. The purpose of development is to make simple
models for large scale simulations which are not able to be performed by
the technique currently used. The space-time FEM, which controls the size
of the time steps with the mesh size of the space, is expected to improve
the stability and efficiency of calculation.

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