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How do I set up initial particles condition?

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Old   March 16, 2015, 04:36
Default How do I set up initial particles condition?
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sohn donh kyung
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Hello.

I wanna simulate a fluidized bed reactor with initial particle condition by using fluent DPM.

but, I am so confused about making initial information file for particles.

I made file like below and set up by injection

---------file start---------------------------------------------------------------
((x y z u v w temperature diameter mass-flow)name)

((-0.0060 -0.0735 0.0015 0.0 0.0 0.0 300.0 0.0025 0.0) injection-0:0)

((-0.0030 -0.0735 0.0015 0.0 0.0 0.0 300.0 0.0025 0.0) injection-0:1)

....
---------file end----------------------------------------------------------------

but, I only can see below massage

---------------------------------------------------------------------------------
ERROR reading particle 0 for injection: injection-0.

Particle streams from injection-0:
STREAM ...........................INITIAL VALUES...........................
NO TYP (X) (Y) (Z) (U) (V) (W) (T) (DIAM) (MFLOW)

...
---------------------------------------------------------------------------------

I don't know what is the problem. T T

Please anybody help me.

thank you for your help!!

sohn
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Old   March 16, 2015, 05:55
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Is the line "((x y z u v w temperature diameter mass-flow)name)" literally in the injection file? Remove this line.
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Old   March 16, 2015, 09:31
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sohn donh kyung
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Thank you, e.

The error massage disappears due to your recommendation.

But, I have a new problem.

I can't find my initial particle in my domain through the calculation!!

I want that my particles just stay at given position.

What can I do for that?

Regards

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Old   March 16, 2015, 17:06
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If you wanted your particles to remain stationary (why?) you could set the drag, gravity and other particle forces to zero. Then your particle would have zero acceleration and remain still.
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Old   March 17, 2015, 01:12
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sohn donh kyung
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Thank you for kind answer, e

I mean..

I can't see any particles in my domain.

It seems that the initial particles don't evolve in my computation.

I still see below massage while the 'ERROR' word disappear.

----------------------------------------------------------------------------
Particle streams from injection-0:
STREAM ...........................INITIAL VALUES...........................
NO TYP (X) (Y) (Z) (U) (V) (W) (T) (DIAM) (MFLOW)

....
-----------------------------------------------------------------------------

Maybe is this the problem?

What can I do for that?


Regards

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Old   March 17, 2015, 05:17
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Try setting a mass flow rate for the injection streams.
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Old   June 29, 2015, 09:17
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Hi,

I am new to Fluent and I am also doing DPM and DEM.

I think the order in your injection file is not right. My files are in this order:

((x y z u v w diameter temperature mass-flow)name)

And Im not using a header in my files. Also you have to set a massflow. Use a very small stoptime (smaller than your timesteps) in your injection an than you have to set your massflow like this:

mf = mass of one particle / stoptime

Hopefully this works for you.

Regards
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