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# Pressure Drop Through a Valve Using CFD

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In this slide deck, learn about how pressure forces exerted on valve components during operation are critical to both performance and product life span. Additionally, watch the webinar to learn how fluid flow simulation (CFD) helps engineers and designers identify flow characteristics such as high pressure regions, allowing them to make educated design decisions. With SimScale, use CFD simulation via a standard web browser to calculate pressure drop in valves today.

Watch the webinar here: https://youtu.be/tc5VBS8V1jo

Published in: Engineering
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### Pressure Drop Through a Valve Using CFD

1. 1. PREDICTING PRESSURE DROP THROUGH A VALVE MATT BEMIS
2. 2. PREDICTING PRESSURE DROP THROUGH A VALVE ● Question 1 ○ For a given pressure drop, what is the resulting flow rate? ● Question 2 ○ How does this change with respect to plug position?(Source: https://en.wikipedia.org/wiki/Globe_valve#/media/File:Globe_valve_diagram.svg) (Source: https://grabcad.com/library/globe-valve-design-2)
3. 3. GEOMETRY PREPARATION Original Geometry Simulation-Ready Valve
4. 4. FLOW VOLUME EXTRACTION ● Inlet/outlet extensions: ○ ANSI standard ● Flow volume extraction: ○ Domain = negative of valve assembly
5. 5. WHAT IS THE END GOAL OF THE SIMULATION? The flow coefficient of a device is a relative measure of its efficiency at allowing fluid flow. It describes the relationship between the pressure drop across an orifice, valve or other assembly and the corresponding flow rate.Where: Q = flow rate (GPM) SG = Specific Gravity (water = 1) ΔP = Pressure Drop (expressed in psi)
6. 6. VALVE POSITION VS. FLOW CHARACTERISTICS ● Globe valve ● Develop flow coefficient ● % valve open vs. % of full flow (Source: http://www.industrialcontrolsonline.com/sites/default/files/infotech/Infotec33/image002.gif)
7. 7. SETUP
8. 8. SIMULATION SETUP – BOUNDARY CONDITIONS 1 PSI 0 PSI ● 6 different positions ● 1, 2, 4, 6, 8, 10 mm open ● % open vs. Cv value ● % open vs. flow rate
9. 9. SIMULATION SETUP – MESH ● Hex-dominant automatic meshing sizing ● Moderate fineness ● 4 refinements: ○ Feature refinement ○ Surface refinment ○ Region refinement ○ Wall layers
10. 10. SIMULATION SETUP – RESULT CONTROL
11. 11. RESULTS – PARTICLE TRACES Particle traces showing velocity
12. 12. RESULTS – VELOCITY MAGNITUDE Cut plane showing velocity through cross section
13. 13. RESULTS – PRESSURE Velocity cut plane showing velocity through cross section
14. 14. RESULTS – PERCENT OPEN VS. FLOW COEFFICIENT
15. 15. RESULTS – DISTANCE OPEN VS. FLOW RATE
16. 16. RESULTS – VALVE POSITION VS. PLUG FORCE