The possibilities of the modern software package of block - modular simulation to the transient simulation tasks in the gas stream in the natural gas transportation area are considered. An approach to modeling in vec tor format the spatiall y distributed cell model object generated on the special nonlinear basis is offered. This permits to solve the problems on diagnosis and flow control in the transient processes by macro - cellular modeling of its mass and kinetic energy balance. The adequacy

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... of the starting and ending state of the cell model is provided by the calculation of the reference - parameter vector that characterizes the steady - state flow, and by comparing it with these states.