Structural engineers and non-structural software

The increase in computer speed and the reduction in their cost has enabled computational geometry and computational fluid dynamics to gain remarkable importance. In computational geometry, all that parametric design means is that there is some system of rules which state that if some quantities (or parameters) change then other quantities should also change. It is impossible to predict what rules an architect or engineer will require between all the variables and therefore parametric systems such as MicroStat ion Generative Components or Digital Project for CATIA from Gehry Technologies provide a programming or scripting environment for designers to write their own rules. The linear size of the computational mesh and the time step are both approximately proportional to the inverse of the Reynolds number. Thus the computer time is proportional to the cube of the Reynolds number in two dimensions and the Reynolds number to the power 4 in three dimensions.