# I need to fix total volume fraction

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 January 17, 2007, 08:32 I need to fix total volume fraction #1 Yasser Guest   Posts: n/a hello i am using eulerian two phase model to simulate the flow in mixing tank. after post processing, i find the solid volume fraction become lower than its patched value .... I read that another one used UDF to fix the total volume fraction to a certain value and he gave this link in the references http//www.fluentusers.com/udf_archieve/udf_examples/UDF52.htm but i don't have access to this site can anyone help me? thank you

 January 17, 2007, 13:12 Re: I need to fix total volume fraction #2 Suijth Guest   Posts: n/a what is your simulation? If you just want to keep the initial values of the vol fraction, you can turn off the volume fraction equation from solving it, in the solution controls panel.. -Sujith S Nair

 January 17, 2007, 13:24 Re: I need to fix total volume fraction #3 Yasser Guest   Posts: n/a i am modelling two phase flow (solid-liquid) in mixing tank and thx for your suggestion i don't want to keep the initial values ... i am studying solids concentration. just i need the total volume fraction in the tank be the same as initially patched. thx for reply

 January 17, 2007, 17:19 Re: I need to fix total volume fraction #4 Sujith Guest   Posts: n/a After patching your initial value of the patched variable will be over written. if u want to keep this for rest of simulation , you can switch off vof eqn.

 January 17, 2007, 17:47 Re: I need to fix total volume fraction #5 Yasser Guest   Posts: n/a Thanks very much

 January 18, 2007, 02:25 Re: I need to fix total volume fraction #6 Yasser Guest   Posts: n/a hello now i turned the equation off, but the volume fraction didn't change from cell to another i need the volume fraction of solids to change from cell to another but i need the average volume concentration overall the tank to remain constant (which is not happened when turning the vof eq. on). thx Yasser

 August 1, 2011, 15:14 Urgent!! #7 New Member   Olusogo fire Join Date: Jun 2011 Posts: 9 Rep Power: 6 pls yasser. I am working on the scour under pipeline. I am having the same problem you had. Where you able to find solution to it. I will really appreciate your response cos I have to submit my Thesis by august 9. thank you very much

August 1, 2011, 15:15
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Olusogo fire
Join Date: Jun 2011
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Quote:
 Originally Posted by Yasser ;138273 hello now i turned the equation off, but the volume fraction didn't change from cell to another i need the volume fraction of solids to change from cell to another but i need the average volume concentration overall the tank to remain constant (which is not happened when turning the vof eq. on). thx Yasser
pls yasser. I am working on the scour under pipeline. I am having the same problem you had about the volume fraction reducing. Were you able to find solution to it. I will really appreciate your response cos I have to submit my Thesis by august 9 I can get result due to the wrong volume fraction result. thank you very much

 August 3, 2011, 08:10 #9 New Member   zino Join Date: Mar 2010 Posts: 23 Rep Power: 7 I think you need mass conservation. there are options in multiphase. I have used eulerian approach. that approach provide mass conservation option

 August 3, 2011, 13:37 #10 New Member   Olusogo fire Join Date: Jun 2011 Posts: 9 Rep Power: 6 @zino Pls how do I set mass conservation because I am using eulerian granular phase model in which sand is taken as the granular phase while water is the continuum

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