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How to Fill as Quadratic

Filters and screens impose a pressure drop that varies with flow rate. The variation is non-linear, but manufacturers will often provide only one data point for pressure loss at the design flow rate. Using a single point, or constant pressure drop, can produce significant inaccuracies in your model. With this in mind, AFT offers the “Fill As Quadratic” option for entering loss data.

Using only a single point, “Fill As Quadratic” will create two additional points for you. This first is simply 0,0; zero flow produces zero pressure drop. The second point is 2 x Flow and 4 x Pressure Drop. A curve is then fit through all three points and there you have it; a quadratic loss profile from only one data point. By using values along the curve, more realistic losses can be modeled for a wide range of flow rates.

The Fill As Quadratic feature is available in AFT Fathom, AFT Arrow, and AFT Impulse.

 

Multi Scenario Output
Jumping From Pipe to Pipe or Junction to Junction

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