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Detailed Help Files | Example Models

AFT Documentation Portal

AFT Arrow FAQ's

How has AFT Arrow been verified?

There are several aspects to AFT Arrow verification. First, AFT Arrow has been compared to published data where it exists. Available published data is usually for a single pipe, which is a trivial solution for a network solver. Models, comparisons and explanations for such published predictions are given the Verification folder within AFT Arrow. Second, it can be verified that the AFT Arrow results agree with mass and energy conservation along with the fundamental equations for compressible flow in single pipes and networks. Third, AFT Arrow offers two independent solution methods, which can be compared against each other. Fourth, incompressible gas flow predictions for networks show good agreement with incompressible calculation methods such as AFT Fathom. Finally, AFT Arrow predictions have been compared to test data and other analytical methods on numerous occasions and good agreement has been shown. For example, see Winters, B.A., and T.W. Walters, "X-34 High Pressure Nitrogen Reaction Control System Design and Analysis".

Can I install AFT Arrow onto a local or wide area network?

Yes, AFT Arrow can run off the network or local PC. When installed on a network, the number of concurrent users is limited to the number of licenses purchased. See the Installation page for information on installing the software with either a USB key or an eLicense.

Capabilities

Does AFT Arrow handle sonic choking?

AFT Arrow accurately models sonic choking at all three possible geometric conditions. See Sonic Choking for more information.

Reporting

How do I quickly change the units for an output parameter?

Whereas the Output Control window allows you specify units for all parameters, when in the Output window viewing results you can quickly change the units for parameters in the tabular displays by double-clicking the column header.

Costing

I see cost settings for Material, Installation, Maintenance and Operation. Do I need to specify costs for each one?

No. Depending on your goal, you need only specify the costs for which you are interested. If you are looking for just a first-cost estimate then you need to only specify Material and possibly Installation. Remember, these are very broad categories and can be tailored to meet your specific application.

Database

How do I set up custom libraries on my local PC?

See ‘Libraries’ in the AFT Arrow help file.

Modeling

How do AFT Arrow's solution methods compare to traditional handbook methods for gas flow?

AFT Arrow solves the governing equations of compressible flow without simplifying assumptions, and is thus more accurate than traditional handbook methods. See the Solution Method Overview article in the AFT Arrow Help system for more information.

Interface

How do I change the icon for a junction?

Open the Junction Properties window, click the Optional folder tab, and then click the Change Icon button.

Modules

What kinds of transients can Arrow XTS model?

Arrow XTS can model a wide range of transients, including tank pressures, valves open/close, compressor changes, relief valve opening and more. Just as important, Arrow XTS can model time transients, event transients and inherent transients. Time transients are changes that are specified to occur based on the model time. Event transients, on the other hand, are triggered by an event that occurs in the system. Many kinds of events can be used, such as pressure, flow, velocity and liquid level. Inherent transients are changes that occur by the very nature of a system component. One example would be depressurization of a tank, while another would be a relief valve opening and closing as a result of pressure changes.

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