zone ratio command

Syntax

zone ratio keyword

Primary keywords:

average    local    maximum

The ratio limit for mechanical, thermal and fluid-flow calculations using the model solve can be calculated in three ways, as defined by the following keywords:

average

The ratio is defined to be the average unbalanced mechanical force (or heat-flux or fluid-flow) magnitude for all the gridpoints in the model divided by the average applied mechanical force (or heat flux or fluid flow) magnitude for all the gridpoints (default).

local

The ratio is defined to be the maximum value of the ratio of the unbalanced mechanical force (or heat-flux or fluid-flow) magnitude to the applied mechanical force (or heat-flux or fluid-flow) magnitude for all the gridpoints in the model.

maximum

The ratio is defined to be the maximum unbalanced mechanical force (or heat-flux or fluid-flow) magnitude for all the gridpoints in the model divided by the average applied mechanical force (or heat flux or fluid flow) magnitude for all the gridpoints.

In increasing order of stringency, the conditions are:

average

ensures a majority of zones are in equilibrium.

maximum

ensures that all unbalanced forces are below a certain value, compared to average forces for the whole model.

local

ensures that each local unbalanced force is less than some fraction of the local forces, averaged for each gridpoint. This criterion can be misleading if some zones have very small stresses, because even a large ratio for one gridpoint may not be very important, given that the associated zone contributes almost nothing to the overall response.