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Old   February 27, 2015, 15:03
Default flowRateProfile
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I am using coalChemistryFoam.
1,In the patchInjection, there is a keyword "flowRateProfile", what doest it mean?
2, If massTotal is 0.001625, SOI=0, duration=0.5, so massFlowRate=massTotal/duration=0.00325, is it right?

Anyone can help me?Thank you.
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Old   May 10, 2016, 22:39
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Quote:
Originally Posted by musabai View Post
I am using coalChemistryFoam.
1,In the patchInjection, there is a keyword "flowRateProfile", what doest it mean?
2, If massTotal is 0.001625, SOI=0, duration=0.5, so massFlowRate=massTotal/duration=0.00325, is it right?

Anyone can help me?Thank you.
Hey have you solved ur problems?
I have the same question, what does flowRateProfile mean?
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Old   May 11, 2016, 11:43
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Quote:
Originally Posted by chpjz0391 View Post
Hey have you solved ur problems?
I have the same question, what does flowRateProfile mean?
I think it's just mass flow rate. Hope this is helpful.
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Old   May 11, 2016, 16:37
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I'm also working on a Lagrangian dispersion problem.

As far as I understand "FlowRateProfile" specifies the source mass flow rate as a function of time. See for example tutorial ./sprayFoam/aachenBomb/constant/sprayCloudProperites.

You could also specify a "sizeDistribution" for the individual particles.

Does anyone know of a good documentation source for the Lagrangian Cloud Properties file? I.e. an explanation of what options are and units of parameters?

Thanks,

Anders
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Old   May 12, 2016, 21:20
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Quote:
Originally Posted by musabai View Post
I think it's just mass flow rate. Hope this is helpful.
Thanks for your reply. Here I have some other questions,
1.after the simulation, do you know how to count the particles number in a specified area? do you have any hints?
2. do you simulate a steady state or transient state? In tutorial simpleReactingParcelFoam, patch is another inlet which inlet air with a certain velocity. can we just inject particles without airflow? If we can, how should we set the BD.

Sorry for my poor English. Hope you can understand.
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Old   May 12, 2016, 21:24
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Quote:
Originally Posted by fluidos View Post
I'm also working on a Lagrangian dispersion problem.

As far as I understand "FlowRateProfile" specifies the source mass flow rate as a function of time. See for example tutorial ./sprayFoam/aachenBomb/constant/sprayCloudProperites.

You could also specify a "sizeDistribution" for the individual particles.

Does anyone know of a good documentation source for the Lagrangian Cloud Properties file? I.e. an explanation of what options are and units of parameters?

Thanks,

Anders
Hi Anders, could you specify your request? what kind of lagrangian cloud properties file do you want? steady-state or transient or different injector?

By the way, do you know how to count the number of particles after simulation?
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Old   May 13, 2016, 13:14
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I'd like to do massless Lagrangian particles with stochastic dispersion for a steady state, simpleFoam problem (e.g. a RANS problem).

In principle if I have already computed the velocity field this should be a post processing computation. Do you know of any tutorials on how to do that?

Unfortunately I do not know of a good way to count particles. One suggestion is that you could export the position of each particle for the timestep of interest and write a Python or Matlab script to search and count in the 3D subdomain.

Regards,

Anders
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Old   August 15, 2016, 11:35
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Quote:
Originally Posted by musabai View Post
I think it's just mass flow rate. Hope this is helpful.
Hi musabai and other Dear foamers,

I want to simulate coal combustion in steady State but i couldn't find steady solver for it thus I solves it with coalChemistryFoam
which is transient until it reaches to steady state . Does anybody have better recommend?

Ok,
I modified coalCloud1Properties to this:
Code:
 type                       patchInjection;
            massTotal                 0.09167;
            parcelBasisType       mass;
            SOI                   0;
            patchName              in_1;
            duration              20; 
            U0                  (26 0 0);
            massFlowRate        0.004583;//kg/s
            parcelsPerSecond     1e5;
            flowRateProfile constant 1;
I know massFlowRate=0.00458 thus for 20 seconds (optional) I adjusted massTotal=0.09167 for massTotal/20=massFlowRate 0.004583.
Is this work right?

Is "flowRateProfile constant 1" right? I think it means to uniform profile for particle inject with 'massFlowRate= 0.00458'. Am I right?

I set 'parcelsPerSecond = 1e5' approximately. I don't know what must I put exactly. Is it a normal input for it?

I excuse because of my poor english writing.

Best Regards.
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Old   September 15, 2016, 05:41
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Quote:
Originally Posted by musabai View Post
I think it's just mass flow rate. Hope this is helpful.

injectionModels has an option "massFlowRate" thus flowRateProfile must be something else.
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