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AFT Blog

Welcome to the Applied Flow Technology Blog.
John Rockey

Model Specialty Valves Accurately with AFT Impulse 5

Applied Flow Technology is proud to release a new version of AFT Impulse , now at version 5. AFT Impulse 5 encapsulates all of the new interface and navigational enhancements from AFT Fathom 8 , as well as a considerable breadth of new and improved technical features. One such feature is our newly enhanced Relief Valve Junction. A relief valve can still be modeled as Internal, Exit, or Inline Exit, but we now offer four unique opening/closing profiles as well. With these new profiles, you can now directly model many specialty valves which were previously difficult to model accurately! Another very...
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Applied Flow Technology

Announcing the Winners of the 2013 Platinum Pipe Award!

Now in its 9th year, the AFT Platinum Pipe Award recognizes excellence in piping and ducting system modeling using AFT software. We are pleased to congratulate the winners of the 2013 AFT Platinum Pipe Award! For the first time this year, we have awarded an honorable mention. Use of Software Features and Model Creativity Winner: Jordan Grose, Beta Machinery Analysis, Canada AFT Impulse was used to solve significant waterhammer occurring after pump trip and check valve closure. Assigned flow junctions were manipulated to make the pressures match at the pump discharge check valves, showing a creative use of the software’s features....
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Trey Walters

AFT Fathom Smooths Earthquake Impact From California's San Andreas Fault

The Los Angeles Aqueduct conveys water from the Owens River in the Eastern Sierra Nevada mountains to the city of Los Angeles. The system provides 80% of the water to Los Angeles. Part of the aqueduct system travels through the 5.5 mile (9 km) Elizabeth Tunnel. The San Andreas fault cuts across the tunnel and a major earthquake at this location has the potential to cut off this water supply to the city for over a year. Ray Hamilton of AMEC made a fascinating presentation of his work using AFT Fathom on the Elizabeth Tunnel at the AFT Denver User Group...
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Ben Keiser

Use Control Valve Junctions to Size Valves and Orifice Plates

AFT Fathom can EASILY size valves AND orifice plates with a SINGLE Control Valve junction!  There is no need to perform strenuous hand calculations to determine a valve Cv or an orifice diameter.  Just specify the system boundary conditions, pipe input properties, and the desired flow rate (or pressure) and AFT Fathom will calculate the Cv, K factor, and equivalent orifice diameter/area for you all at once! Figure 1 illustrates a control valve junction at the location of a valve or an orifice plate.  For known flow, use a Flow Control Valve (FCV).  For known upstream pressure, use a Pressure Sustaining...
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Ben Keiser
Well, you could place a control valve upstream of the orifice plate to control the flow. However, the idea behind this article is... Read More
Friday, 25 November 2016 03:11
Ben Keiser
Hi Adam, thanks for your question! What you need to do is to open the Output Control window, then click on the "Valves" button in... Read More
Monday, 28 January 2019 17:43
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Trey Walters

Who Cares About the Surge in "Funny" Fluids?

Well, it turns out lots of people. My first experience with "funny fluids" was in graduate school. One of my fluids professors had recently completed his doctoral thesis on funny fluids also known as non-Newtonian fluids. I got to see some of his graduate students do some crazy experiments with polymer additives to otherwise boring Newtonian fluids. Funny, non-Newtonian fluids are often broken into two categories:  Homogeneous fluids which encompasses non-settling slurries where the fluid and solids behave in an aggregate, homogeneous manner Heterogeneous fluids which encompasses settling slurries where the fluid and solids behave somewhat independently The applications where non-Newtonian fluid...
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John Rockey

Exhaustive Tolerance Criteria

AFT Arrow uses Newton iteration to find a simultaneous solution for all junction pressures. Well, maybe not all junctions. When “Use Exhaustive Tolerance Criteria” is NOT selected, AFT Arrow will only check junction pressures that find their way into the solution matrix. The AFT Arrow solver builds a matrix of equations based on the number of flow splits in the model. Each flow split must have a common pressure that is consistent with the flow and pressure drop in all of the connected pipes. Finding the right pressure for each flow split can become rather tricky. To find the pressure using...
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Trey Walters

Coming Soon To a Computer Screen Near You: AFT Impulse 5 - Act Now To Get New Features at Old Prices

We are excited about all the new features coming in our AFT Impulse 5 waterhammer and surge modeling software. We plan to release this much anticipated new version before the end of the year. Want to know what new features are coming? Read on!                       Waterhammer Modeling of Slurry Pipe Flow AFT Impulse 5 will offer a new add-on SSL module for modeling slurry flow in piping systems. Why is this important? The AFT Impulse 5 SSL module will offer the first commercially available waterhammer modeling of settling slurry piping systems....
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Trey Walters
Please send you tech support questions to support@aft.com. This is not a support forum. Thanks.
Monday, 01 June 2015 15:37
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