Constant Particle Distribution

Simulaner · April 16, 2020, 03:40

Hi all,

I have to simulate oil droplets during cooking process and i want to imput 5 different Particle Sizes with the same releas number of each particle size, but I don't know how. So I have a constant Distribution and not a Normal Distribution or Rosin-Rammler.

Can anyone please tell me how to do that?

Thanks in advance!

ping · April 16, 2020, 23:37

i think you only have two options when you want 5 specific set of sizes - add 5 injectors - create the first and then copy and paste and change the sizes, or maybe use one injector with size specified as a field function but this would be quite a complex user ff to develop

Simulaner · April 20, 2020, 03:12

Hello Ping,
thank you! I will use 5 injectors.

I have 2 more Question:

1. Do I still need a parcel study? Because in this case I don't have a particle distribution in one injector.

2. Is there a way to count the different particle sizes which are injected. I only found a way to count them all together, but I want to know the sum of each particle size.

Thank you in advance

ping · April 20, 2020, 08:48

not sure what you mean by a parcel study.
there are field functions to allow you to create a subset of particles and parcels based on a range of parameters including size so you can use these to both count numbers etc in reports and display subsets in scenes.

Simulaner · April 21, 2020, 02:16

Which function do you mean?

The Star Help Side has following function:
2e-6 < ${TrackParticleDiameter} && ${TrackParticleDiameter} < 8e-6 ? ${TrackParcelMassFlowRate} : 0

But it is only for study flow, I have a transient flow with lagrangian particles. In transient, there is no TrackParcelMassFlowRate

ping · April 21, 2020, 02:35

there is a list of at least 60 fields that become available for use everywhere when LMP is enabled - see the list here Simulating Physics > Multiphase Flow > Using the Lagrangian Multiphase Model > Lagrangian Multiphase Field Functions Reference. you could also open field functions in tools and expand the lists.
you should also read and understand this section for what you are trying to do Simulating Physics > Multiphase Flow > Using the Lagrangian Multiphase Model > Post-Processing Lagrangian Data

April 16, 2020, 03:40	Constant Particle Distribution	#1
Simulaner New Member Mina Join Date: Apr 2020 Posts: 5 Rep Power: 6	Hi all, I have to simulate oil droplets during cooking process and i want to imput 5 different Particle Sizes with the same releas number of each particle size, but I don't know how. So I have a constant Distribution and not a Normal Distribution or Rosin-Rammler. Can anyone please tell me how to do that? Thanks in advance!

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April 16, 2020, 23:37		#2
ping Senior Member Ping Join Date: Mar 2009 Posts: 556 Rep Power: 20	i think you only have two options when you want 5 specific set of sizes - add 5 injectors - create the first and then copy and paste and change the sizes, or maybe use one injector with size specified as a field function but this would be quite a complex user ff to develop

April 20, 2020, 03:12		#3
Simulaner New Member Mina Join Date: Apr 2020 Posts: 5 Rep Power: 6	Hello Ping, thank you! I will use 5 injectors. I have 2 more Question: 1. Do I still need a parcel study? Because in this case I don't have a particle distribution in one injector. 2. Is there a way to count the different particle sizes which are injected. I only found a way to count them all together, but I want to know the sum of each particle size. Thank you in advance

April 20, 2020, 08:48		#4
ping Senior Member Ping Join Date: Mar 2009 Posts: 556 Rep Power: 20	not sure what you mean by a parcel study. there are field functions to allow you to create a subset of particles and parcels based on a range of parameters including size so you can use these to both count numbers etc in reports and display subsets in scenes.

April 21, 2020, 02:16		#5
Simulaner New Member Mina Join Date: Apr 2020 Posts: 5 Rep Power: 6	Which function do you mean? The Star Help Side has following function: 2e-6 < ${TrackParticleDiameter} && ${TrackParticleDiameter} < 8e-6 ? ${TrackParcelMassFlowRate} : 0 But it is only for study flow, I have a transient flow with lagrangian particles. In transient, there is no TrackParcelMassFlowRate

April 21, 2020, 02:35		#6
ping Senior Member Ping Join Date: Mar 2009 Posts: 556 Rep Power: 20	there is a list of at least 60 fields that become available for use everywhere when LMP is enabled - see the list here Simulating Physics > Multiphase Flow > Using the Lagrangian Multiphase Model > Lagrangian Multiphase Field Functions Reference. you could also open field functions in tools and expand the lists. you should also read and understand this section for what you are trying to do Simulating Physics > Multiphase Flow > Using the Lagrangian Multiphase Model > Post-Processing Lagrangian Data