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How to get the surface area between two phases in VOF model

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Old   July 12, 2012, 00:19
Unhappy How to get the surface area between two phases in VOF model
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Cloud Zhang
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Do anyone know if there has a macro to get the surface area between two phases in VOF model. I used Geo-Reconstrust Discretization for VOF.
I found C_VOF_S(c,t) and Get_Surface_Distance(cell_t c, Thread *t) in "sg_vof.h". I wanted to use them to found what did they return. But always fluent return errors:

Error:
FLUENT received fatal signal (ACCESS_VIOLATION)
1. Note exact events leading to error.
2. Save case/data under new name.
3. Exit program and restart to continue.
4. Report error to your distributor.

I tried mixture thread and one phase thread for t in C_VOF_S(c,t) and Get_Surface_Distance(cell_t c, Thread *t),but the errors still exist.
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Old   September 10, 2012, 03:34
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Hi, Cloud,
Have you solve you problem? I need to calculate the interface area in VOF model, and I'm wondering how to implement this. If you've solve this problem, plz help.
Thank you !
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Old   February 5, 2013, 16:16
Default any luck?
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Bradley J
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Hi,

I just posted a similar question and I am wondering if you guys have found out how to obtain the area of the interface using an UDF?

Bradley
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Old   February 17, 2013, 20:27
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Interfacial area could be calculated by the following:

Magnitude of Gradient(Alpha) * Volume

Hope it helps.
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Old   January 10, 2014, 03:41
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Cloud Zhang
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Quote:
Originally Posted by vig View Post
Interfacial area could be calculated by the following:

Magnitude of Gradient(Alpha) * Volume

Hope it helps.
Thanks! It's helpful. Another question: Which literature can I find this equation ?
Does the fluent help has this equation?
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Old   August 8, 2014, 23:53
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M.C.Qin
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Quote:
Originally Posted by Cloud View Post
Thanks! It's helpful. Another question: Which literature can I find this equation ?
Does the fluent help has this equation?

Hi,
I also confused with such a difficult question when i want to simulate the gas-liquid flow in a falling film reactor. how to get the the interface area in a cell using UDF micros? there were an equation in "help" to calculate the area density, area =2.0*[alpha]*the gradient of [alpha]. But this equation may be a wrong one. Besides of this, how to get the gradient of [alpha]? when you use the macro C_VOF_G, there will be notes: access violate.

Are you from China? Maybe we can discuss this problem in Chinese.my e-mail:classic1573@163.com
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Old   August 21, 2014, 21:31
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Bill Wang
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Hi vig,
I wonder if the equation is also applied to the wick-vapor interface?
Regards,
Bill
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