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-   -   Calculate interfacial area (http://www.cfd-online.com/Forums/fluent/107236-calculate-interfacial-area.html)

LyngHoo September 20, 2012 22:45

Calculate interfacial area
 
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:)

kbaker September 23, 2012 01:17

What type of flow regime you working with?

LyngHoo September 23, 2012 02:01

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

kbaker September 23, 2012 03:05

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?

shk12345 September 25, 2012 11:17

use
C_VOF(c,t) in udf to acess that parameter that parameter that you want to know

shk

LyngHoo September 25, 2012 21:03

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)?

pointh October 6, 2012 00:01

Quote:

Originally Posted by LyngHoo (Post 383624)
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 "?

LyngHoo October 12, 2012 21:09

Thank you pointh,
I'll try your method. And I can't figure out this equation neither. sorry.

sajid December 13, 2012 16:28

1 Attachment(s)
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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