# Calculate interfacial area

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 September 20, 2012, 22:45 Calculate interfacial area #1 New Member   Join Date: Nov 2010 Posts: 12 Rep Power: 7 Hi all, I'm currently simulating gas-liquid two phase flow using VOF method. I came across a method to calculate the interfacial area recently, and I'm very interesting in it. According this method, the local interfacial area in an interfacial cell is calculated from the cell fluid fraction gradient, Ai = |grad f|i * Vi where, Ai is the interfacial area of cell i, |grad f|i is the fluid fraction gradient of cell i, Vi is the volume of cell i. Could anybody tell me how to access the value of |grad f| in Fluent. Thanks a lot

 September 23, 2012, 01:17 #2 Senior Member     Khalid Baker Join Date: Mar 2009 Location: IRAQ Posts: 129 Rep Power: 9 What type of flow regime you working with?

 September 23, 2012, 02:01 #3 New Member   Join Date: Nov 2010 Posts: 12 Rep Power: 7 Hi, kbaker I'm working with a T-shaped mixing zone, the computational domain is 3D. The two inlets are for gas and liquid respectively. I need to calculate the interfacial area of the main channel. Can you help with that? thanks

 September 23, 2012, 03:05 #4 Senior Member     Khalid Baker Join Date: Mar 2009 Location: IRAQ Posts: 129 Rep Power: 9 Do you have any paper about what are you trying to do? if you have send it to my email khalidb77@gmail.com its better to understand your problem well?

 September 25, 2012, 11:17 #5 Senior Member   shoeb khan Join Date: Nov 2011 Posts: 179 Rep Power: 6 use C_VOF(c,t) in udf to acess that parameter that parameter that you want to know shk

 September 25, 2012, 21:03 #6 New Member   Join Date: Nov 2010 Posts: 12 Rep Power: 7 thanks shk C_VOF(c,t) returns the volume fraction for cell c, however how can I calculate the gradient of C_VOF(c,t)?

October 6, 2012, 00:01
#7
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jie
Join Date: Oct 2012
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Quote:
 Originally Posted by LyngHoo thanks shk C_VOF(c,t) returns the volume fraction for cell c, however how can I calculate the gradient of C_VOF(c,t)?
Hello,
Haven't you solved the problem? If you haven't, you can try the "C_VOF_G". Additionally, could you explain the meaning of equation"Ai = |grad f|i * Vi "?

Last edited by pointh; October 6, 2012 at 02:49.

 October 12, 2012, 21:09 #8 New Member   Join Date: Nov 2010 Posts: 12 Rep Power: 7 Thank you pointh, I'll try your method. And I can't figure out this equation neither. sorry.

December 13, 2012, 16:28
#9
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Chaudhary
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Location: Pakistan
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i want to calculate area of circles which would be used in ansys fluent ....
it is 2d heat exchanger and i have problem how to calculate area of circle in front of flow or which area i have to put in reference value ..
i have confusion whether i have to use area of 2 or 4 circles ???
kindly tell me how to calculate this area or which area i have to put in reference value ??? i have attached the jpeg. file of structure to further explain it ?
waiting for answer...i will be very thankful to you.
what Reference values should I used in fluent to find the area as defaults values are 1 for area,depth and length.
Area=?
Depth=?
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