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July 2, 2012, 13:15
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butterfly valve
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#1 |
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New Member
Amir sadeghi pour marvi
Join Date: Dec 2011
Posts: 25
Rep Power: 14  |
I'm simulating a butterfly valve. multi phase
Testing was conducted in 18-inch water pressure drop is measured. 24 inches of water pressure in my simulation is achieved. What causes this difference? |
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July 2, 2012, 14:44
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#2 |
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Member
Luis Filipe Fabiani
Join Date: Apr 2009
Posts: 43
Rep Power: 17 |
How was the pressure drop measured? Does the fluid goes to a reservoir or just recirculates back to the inlet? The pressure drop was measured just before and just after the valve? Or was the outlet and inlet pressure of a pump?
If you just setup the outlet pressure as 0 Pa, the software does not take in account the pressure drop of an expansion after the duct you are simulating. What is the speed at the outlet? According to "Memento Des Pertes de Charge" If the speed is around 2 m/s, it is already enough to cause the 6 inches of aditional pressure drop. |
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July 2, 2012, 14:45
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#3 |
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Member
Luis Filipe Fabiani
Join Date: Apr 2009
Posts: 43
Rep Power: 17 |
Also, multiphase flows are tricky
What exactly are you simulating? |
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July 2, 2012, 18:50
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#4 |
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Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,692
Rep Power: 143 |
This is an FAQ: http://www.cfd-online.com/Wiki/Ansys..._inaccurate.3F
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July 3, 2012, 06:49
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#5 | |
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New Member
Amir sadeghi pour marvi
Join Date: Dec 2011
Posts: 25
Rep Power: 14 |
Quote:
i setup the outlet pressure as 0 Pa. i do not have any information at outlet... air was aspirated through the butterfly valve.Distilled water was introduced upstream of valve. |
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July 3, 2012, 13:15
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#6 |
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Member
Luis Filipe Fabiani
Join Date: Apr 2009
Posts: 43
Rep Power: 17 |
Better check the FAQ that Glenn suggested
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