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Fluent / Re: How can I get particles mean diameters at each cell?
« Last post by tue1984 on August 29, 2012, 06:17:21 AM »
I figured out an easier way to compute the volume flux which is multiplying the volume fraction with the particle velocity.

William: since I have some problems with compiling udf on my computer at work, I have tried to interpret it but Fluent gave me several errors, e.g., "parse error" for the static variable, "undeclared variables P_CELL", etc. Is there any way to modify your udf so that it can be interpreted? If yes, please let me know how. Thanks.
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Fluent / Re: How can I get particles mean diameters at each cell?
« Last post by tue1984 on August 28, 2012, 07:48:08 PM »
Thank you! I realize how the particle velocities can be computed now.

Is there any way that we can compute the particle volume flux or particle mass flux per area for every cell face on a given surface and then write that down as a 2D contour plot? This would be very useful because particle volume flux per area is the variable that is normally measured in the experiments with Phase Doppler Particle Analyzer.

Tue
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Fluent / Re: How can I get particles mean diameters at each cell?
« Last post by william on August 28, 2012, 06:23:17 PM »
You will need to define additional UDMs for this purpose.

The particle velocities at cells can be stored using:

P_VEL(p)[0] ---> x component of particle velocity
P_VEL(p)[1] ---> y component of particle velocity
P_VEL(p)[2] ---> z component of particle velocity

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Fluent / Re: How can I get particles mean diameters at each cell?
« Last post by tue1984 on August 28, 2012, 04:18:09 PM »
Hi William,

Your UDF is really useful. Could you please extend it so that one can compute the following variables at every cell:

1. All particle velocity components u, v and w.

2. Volume flux (m3/s/m2) which is defined as: particle volume/time interval/cell area

Thank you, Tue.
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Fluent / Re: UDF for population balance method
« Last post by iitgbim on August 25, 2012, 04:40:10 PM »
Will you please tell me which parameter I should have for my problem (Gas-liquid Stirred tank)?
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Fluent / Re: UDF for population balance method
« Last post by william on August 25, 2012, 11:05:17 AM »
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Fluent / UDF for population balance method
« Last post by iitgbim on August 25, 2012, 10:06:32 AM »
I am in need for udf for PBM applicable to gas-liquid stirred tank. Please share if you have any
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Use the forcepanel, which is a free add-on to Fluent 12. After reading the scheme you will get an entry in Reports/Resultant Force. You can write out lift, drag, coordinates of CG, force, moment vs iteration or vs flow-time in a separate file. Enable "moving body coordinate system" and the "print to file". Now open the dynamic mesh panel, and confirm the moving zone with "create". This ensures that the force panel recognices the zone motion. In the force panel click on "update" and "print". If you start the simulation now, an external file will track the quantities.

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How can I get time-dependend information about aerodynamic forces and moments, like lift, drag, euler angle, CG, of moving and stationary walls in FLUENT?

Thanks.
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Fluent / Re: moving wall problem
« Last post by william on August 24, 2012, 09:12:13 AM »
See the tutorial in the PDF attached. You will need to make a UDF for this purpose as well.

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