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Water surface in open-channel model

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Old   March 25, 2014, 06:32
Default Water surface in open-channel model
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Thanatip
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Hi, I have a problem.I run open-channel flow model with 2 phases (air, water). I want to know water surface (depth of flow) in mid section of channel. How I need to do ?
Please help me. I'm very quickly.
Thank you
Mark.
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Old   March 31, 2014, 07:45
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amit
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i have the same problem. i am using VOF and want to see the air water interface. this seems to be difficult as when i export volume fraction data to excel or even observing contour, the interface is not well defined. the volume fraction is varying and giving as low volume fraction as .5 where it is supposed to have 1. what could be the problem or what could be the alternative please suggest...
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Old   April 5, 2014, 13:42
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Quote:
Originally Posted by akjha View Post
i have the same problem. i am using VOF and want to see the air water interface. this seems to be difficult as when i export volume fraction data to excel or even observing contour, the interface is not well defined. the volume fraction is varying and giving as low volume fraction as .5 where it is supposed to have 1. what could be the problem or what could be the alternative please suggest...
dear akjha
surface-iso surface
choose density or volume fraction as iso-parameter,specify 500 as density or 0.5 as VOF respectively.the you will create the interface between water and air.
VOF method cannot give sharp interface, it is a continuate approach in multiphase flow simulation, so it approximately solve "phase jump" problems, accuracy of interface location prediction depends on mesh density around interface
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Old   April 5, 2014, 13:47
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Quote:
Originally Posted by moremarx View Post
Hi, I have a problem.I run open-channel flow model with 2 phases (air, water). I want to know water surface (depth of flow) in mid section of channel. How I need to do ?
Please help me. I'm very quickly.
Thank you
Mark.
dear moremarx
insert iso-surface as density or volume fraction
insert iso-clip at mid plan,choose iso-surface as clip surface
export the iso-clip date and you will see the coordinates of interface in mid section
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