Explicit calculation of compressible flow using approximating functions

The method given in Sections 6.2 to 6.4 of Chapter 6 allows an iterative calculation of steady-state, compressible flow. However, the control engineer is likely to need to calculate the flow of a gas or vapour under a changing set of conditions, implying iteration at each timestep. An explicit method is obviously to be preferred, and this Appendix shows how it is possible to use the established basis of the exact but implicit method to construct an approximate but explicit method of calculation which preserves most of the accuracy. 

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Appendix 2 Explicit calculation of compressible flow using approximating functions... 

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