Overview of AFT xStream
Welcome to AFT xStream™  a visual platform for modeling compressible fluid transients in pipe networks!
AFT xStream brings increased productivity to the pipe flow engineer by combining traditional analysis with an intuitive graphical user interface. By implementing a draganddrop method of pipe flow modeling, AFT xStream simplifies the pipe network modeling process.
AFT xStream can show both input data and analysis results in visual form, allowing rapid analysis of a model's validity. Identifying poor assumptions, catching typographical or modeling errors, and rerunning models are all accelerated because of AFT xStream's graphical environment.
Whether your pipe system model will be used to evaluate and improve an existing system or to design a new one, AFT xStream increases your productivity in the modeling process.
What Can AFT xStream Do?
AFT xStream can be used to model a wide variety of compressible flow systems, including:

Open and closed (recirculating) systems

Network systems that branch or loop, with no limit on the number of loops

Systems with valve transients

Systems with compressor transients

Systems with pressure or flow control valve transients

Multiple design cases in a single model file (Scenario Manager)
AFT xStream's steadystate solution engine is based on standard techniques used for many years in industry. A modified NewtonRaphson method is used to solve the fundamental equations of pipe flow that govern mass, momentum and energy balance. Solutions are obtained by iteration, and matrix methods optimized for speed are employed to obtain convergence. Once a steadystate solution is obtained, AFT xStream simulates the transient using the Method of Characteristics, the most widely used method for solving fluid transient problems.
Where to Start
The best place to start learning about AFT xStream is to work through our example problems found in the xStream Learning Resources.
Addon Module Capabilities
AFT xStream has one addon module that extends modeling capabilities, the Pulsation Frequency Analysis module. Pulsation Frequency Analysis (PFA) allows the engineer to predict resonant frequencies in the system and graphically show the frequency response of a system
Who Can Use AFT xStream
AFT xStream assumes that the user possesses a good general knowledge of compressible flow theory and has at least a basic understanding of fluid transients. Even the most advanced and easytouse software package cannot make up for a lack of fundamental knowledge on the part of the user.
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