Extended Time Simulation (XTS)

An AFT Fathom Add-on Module

Many design and operating simulation questions can’t be answered without knowing
how critical parameters vary over time. Extend your modeling capabilities into the
time domain by performing a series of steady-state solutions with variables
changing automatically to achieve a dynamic simulation of your system.

The module lets you define a wide range of actions to occur during the time simulation, including:

  • Tank volume and liquid level tracking (predict how long to fill and drain tanks)
  • Pump start/stop and speed variation
  • Valve position changes
  • Control valve setpoint variation

Reporting Features

  • Text and graphical output clearly displays time varying parameters such as:
    • liquid height in tanks
    • flow and pressure in pipes
    • pump operating conditions
    • valve position and more
  • Unique animation feature that dynamically displays time varying parameters along selected flow paths

AFT Fathom Extended Time Simulation Module FAQ's

What kinds of transients can the AFT Fathom XTS Module model?

A wide range, including liquid levels, valve open/close, pump speed changes, relief valve opening and more. Just as important, the AFT Fathom XTS module 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.

Two examples would the liquid level change that occurs in a finite reservoir (or tank), while another would be a check valve opening and closing as a result of flow reversals.

AFT Fathom models heat transfer, so does this mean Fathom XTS does as well?

No, when using the AFT Fathom XTS module heat transfer is turned off because the module does not model transient heat transfer. This is primarily because the input required by the user to model transient heat transfer would be very complicated for some components. Consider a tank, for example.

What part of the tank structure participates in transient heat transfer? The immediate tank boundaries would seem to be fairly clear, but what about the supporting structure? It too would be involved to some degree, but to model this would require extensive definition by the user.

Do I have to have one AFT Fathom XTS module license for each AFT Fathom license?

No, there does not need to be a one-to-one relationship. This provides users the flexibility to choose the level of capability they need. For example, you may have several AFT Fathom licenses deployed on your network but only need to use the AFT Fathom XTS Module half the time and, therefore, have a correspondingly lower number of module licenses. If you open a model previously saved using the AFT Fathom XTS Module, AFT Fathom will first try to activate the  module.

If all of the module licenses are being used, a message will be displayed telling you a module license is not available and provide you a choice of continuing to open the model or canceling the load.

This same message will remind you that if you do open and work with the model, AFT Fathom XTS Module  specifications contained in the model may be lost.
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