Calculate interfacial area
Hi all,
I'm currently simulating gasliquid 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 fi * Vi where, Ai is the interfacial area of cell i, grad fi 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:) 
What type of flow regime you working with?

Hi, kbaker
I'm working with a Tshaped 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 
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?

use
C_VOF(c,t) in udf to acess that parameter that parameter that you want to know shk 
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)? 
Quote:
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 fi * Vi "? 
Thank you pointh,
I'll try your method. And I can't figure out this equation neither. sorry. 
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