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February 27, 2015, 15:03 
flowRateProfile

#1 
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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. 

May 10, 2016, 22:39 

#2  
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Ping Chang
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Quote:
I have the same question, what does flowRateProfile mean? 

May 11, 2016, 11:43 

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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 

May 12, 2016, 21:20 

#5 
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Ping Chang
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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. 

May 12, 2016, 21:24 

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Ping Chang
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By the way, do you know how to count the number of particles after simulation? 

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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