[matejek]

Hi everyone,

I'm learnint to use Fluent, and i do the tutorial case of flow fuel droplets througt the engine.
How can i calculate the mass of droplets that flowed throught surface ?
I'm using discrete phase model.

I found one solution of this problem. I set "trap" DPM boundary conditions for this surface and monitored mass fraction of fuel, but this is solutions for only continuous phase, but i want to monitor the weight of the continuous phase and discrete phase separately.

Thanks for response.

[edu_aero]

Originally Posted by matejek

Hi everyone,

I'm learnint to use Fluent, and i do the tutorial case of flow fuel droplets througt the engine.
How can i calculate the mass of droplets that flowed throught surface ?
I'm using discrete phase model.

I found one solution of this problem. I set "trap" DPM boundary conditions for this surface and monitored mass fraction of fuel, but this is solutions for only continuous phase, but i want to monitor the weight of the continuous phase and discrete phase separately.

Thanks for response.

DId u manage to solve it? I am facing the same problem. However I cannot change the boundary condition

[hwet]

Flux report maybe? See the mass imbalance etc, how much came in, how much went out from two surfaces. Can do this in both Fluent post and CFD post.

[edu_aero]

Originally Posted by hwet

Flux report maybe? See the mass imbalance etc, how much came in, how much went out from two surfaces. Can do this in both Fluent post and CFD post.

But there you only get the data of gas not the data of liquid.
I mean by mass flux Fluent gives you the data from the Eulerian fluid, but not from the Lagrangian fluid

[CFDYourself]

Hi,

maybe this will help, I've tried it and it seems to work, though I'm sure there is more-than-one-way-to-skin-a-cat.

1. Extract data:
in Gui, click 'reports', highlight Discretephase:'sample', click 'set up...'
select your outlet under 'boundaries' select the injections under 'release from injections'
click 'compute'.

this should generate a small file called "output.dpm" or something similar in the same folder as your simulation, that contains all the info from individual tracks. you can inspect this in notepad or import to excel if you want to do one-off manual data handling etc.

2. plot the data:
'reports'->click 'Histogram'->click 'set up...'
click 'read' and load the data file
then untick all the boxes at the LHS under 'options',
highlight 'mass-flow' under variables,
when you click 'plot' the total mass flow of particles should appear in the text user interface under "SUM = ________" in units of kg/s.

[edu_aero]

Originally Posted by CFDYourself

Hi,

maybe this will help, I've tried it and it seems to work, though I'm sure there is more-than-one-way-to-skin-a-cat.

1. Extract data:
in Gui, click 'reports', highlight Discretephase:'sample', click 'set up...'
select your outlet under 'boundaries' select the injections under 'release from injections'
click 'compute'.

this should generate a small file called "output.dpm" or something similar in the same folder as your simulation, that contains all the info from individual tracks. you can inspect this in notepad or import to excel if you want to do one-off manual data handling etc.

2. plot the data:
'reports'->click 'Histogram'->click 'set up...'
click 'read' and load the data file
then untick all the boxes at the LHS under 'options',
highlight 'mass-flow' under variables,
when you click 'plot' the total mass flow of particles should appear in the text user interface under "SUM = ________" in units of kg/s.

Thank you

One week ago, I was exporting the data and postproccesing it with Matlab. Nowadays, I have created a macro to save the data that I want and postprocess easily with Matlab

[unnikrishnan]

Originally Posted by CFDYourself

Hi,

maybe this will help, I've tried it and it seems to work, though I'm sure there is more-than-one-way-to-skin-a-cat.

1. Extract data:
in Gui, click 'reports', highlight Discretephase:'sample', click 'set up...'
select your outlet under 'boundaries' select the injections under 'release from injections'
click 'compute'.

this should generate a small file called "output.dpm" or something similar in the same folder as your simulation, that contains all the info from individual tracks. you can inspect this in notepad or import to excel if you want to do one-off manual data handling etc.

2. plot the data:
'reports'->click 'Histogram'->click 'set up...'
click 'read' and load the data file
then untick all the boxes at the LHS under 'options',
highlight 'mass-flow' under variables,
when you click 'plot' the total mass flow of particles should appear in the text user interface under "SUM = ________" in units of kg/s.

Thank you so much for the information
But, I have one doubt... The compute option will be available in report-->sample only when the unsteady particle tracking is disabled in Discrete phase dialogue box right?
If we turn on unsteady particle tracking(2way coupling, instead of compute it will show start and stop only. I tried to do the same procedure but it doesnt work, Do u have any idea how??

[user9]

thankyou for your help.