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41
Fluent / vof with obstacle
« Last post by bahare on September 21, 2012, 09:03:01 AM »
i am modelling a canal with a ostakle in it.i use Adopt_>region  to define volume fraction of water.
velocity inket is 1.77m/s  and depth in enterance is 1.83m.
the flow is sub critical
i cant access this.can anyone help me.
42
Fluent / Time dependent source term
« Last post by moloy_kb on September 06, 2012, 06:44:11 AM »
Dear all,

I am trying to solve the effect of body acceleration on the human arterial system. For that I need to write some codes for a time dependent source term in DEFINE_SOURCE Macros. The acceleration term is given by
a(t) = a0*Cos(omega*t+Phi), where a0 is the amplitude part of the acceleration in mm, but the Fluent document tells that the dimension of the source term should be in N/m^3. How to make the proper dimension for the problem.
43
Fluent / Re: How can I get particles mean diameters at each cell?
« Last post by william on August 29, 2012, 11:21:03 AM »
You can get an estimated solid volume fraction in a cell by diving discrete phase concentration with particle density (assuming that all particles have the same density).

This will be:

C_DPMS_CONCENTRATION(c,t)/P_RHO(p)

You may get a value greater than 1 in certain regions if your case involves dense discrete phase flow.
44
Fluent / Re: How can I get particles mean diameters at each cell?
« Last post by tue1984 on August 29, 2012, 10:35:04 AM »
William: Thanks. Fortunately, I have fixed the compiling issue and it works for me now. One more question though: how do you get the particle volume or volume fraction in every cell? Is it C_VOF(c,t)?

Tue
45
Fluent / Re: How can I get particles mean diameters at each cell?
« Last post by william on August 29, 2012, 09:00:03 AM »
You will have to compile the UDF you can not run it as interpreted because it uses variables.
You will need to sort out the issues with compiling.
46
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.
47
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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