How do I set up initial particles condition?

sohn · March 16, 2015, 04:36

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

`e` · March 16, 2015, 05:55

Is the line "((x y z u v w temperature diameter mass-flow)name)" literally in the injection file? Remove this line.

sohn · March 16, 2015, 09:31

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

sohn

`e` · March 16, 2015, 17:06

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.

sohn · March 17, 2015, 01:12

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

sohn

`e` · March 17, 2015, 05:17

Try setting a mass flow rate for the injection streams.

Eric_TUI · June 29, 2015, 09:17

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 I´m 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

March 16, 2015, 04:36	How do I set up initial particles condition?	#1
sohn New Member sohn donh kyung Join Date: Mar 2015 Posts: 3 Rep Power: 11	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

March 16, 2015, 05:55		#2
`e` Senior Member Join Date: Mar 2015 Posts: 892 Rep Power: 18	Is the line "((x y z u v w temperature diameter mass-flow)name)" literally in the injection file? Remove this line. sohn likes this.

March 16, 2015, 17:06		#4
`e` Senior Member Join Date: Mar 2015 Posts: 892 Rep Power: 18	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. sohn likes this.

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March 16, 2015, 09:31		#3
sohn New Member sohn donh kyung Join Date: Mar 2015 Posts: 3 Rep Power: 11	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 sohn

March 17, 2015, 01:12		#5
sohn New Member sohn donh kyung Join Date: Mar 2015 Posts: 3 Rep Power: 11	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 sohn

March 17, 2015, 05:17		#6
`e` Senior Member Join Date: Mar 2015 Posts: 892 Rep Power: 18	Try setting a mass flow rate for the injection streams.

June 29, 2015, 09:17		#7
Eric_TUI New Member Eric Bachmann Join Date: Jun 2015 Posts: 2 Rep Power: 0	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 I´m 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