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Fig. 9.14. Frontal method of solution.

To minimise memory requirements, which is especially important for jobs with large numbers of dof., the instantaneous width, i.e. front size, of the stiffness matrix during merging should be kept as small as possible. This is achieved by ensuring that elements are selected for merging in a specific order. Figures 9.15(a) and (b) serve to illustrate badly and well ordered elements, respectively, for a simple two-dimensional application. Front ordering facilities are available with some fe. packages which will automatically re-order the elements to minimise the front size.

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