Particle mass calculation

manut · May 18, 2019, 13:12

Hello,

I have different diameter particles stuck to a different surfaces and I would like to know what is the mass of particles that stuck to a particular surface.
It's a steady simulation and I really cannot find the way to calculate it.

BR

Gert-Jan · May 20, 2019, 04:19

May I assume that the particle exit the simulation when they hit these surfaces? Then I would go to Pre and define csv files (Output Control) with information of particles when they exit the simulation. You can add a lot of variables, including particle massflow.

manut · May 20, 2019, 04:31

Thank you for your help.
I have set surface bc in a way that these particles stuck to it as it's quite close to what really happens. Unfortunately CFX does not write info about masses as a default so I set appropriate expert parameter but now it's just impossible to set enough integer memory. I tried change alloc factor to 10 and it was not enough, still getting error either about integer memory or permission denied due to unknown reason (100 GB disk space available).
I guess I need to play with Output Control.

BR

Gert-Jan · May 20, 2019, 04:43

In output control, you can create histograms when particles end on a wall. Via Export you can create the csv files.

BTW, if you have restitution coefficients equal to 0, then I am quite sure that CFX write the massflow information just to the output file. Simply listed. Did you check this? However, if you have a particle size distribution, CFX will give the total mass of all particles in the output file, and not by classes.

manut · May 20, 2019, 04:48

I checked it, good that you have mentioned particle size distribution. Yes, I have different particle diameters, presumably this is the reason why it's not that straightforward to pull these data.

BR

Gert-Jan · May 20, 2019, 04:54

Therefore, use the csv-files. This allows you to export the particle diameter and gives you all info you need.

manut · May 20, 2019, 04:56

I will try that.
Thank you again.

BR

manut · May 20, 2019, 10:59

Quote:

Originally Posted by Gert-Jan

In output control, you can create histograms when particles end on a wall. Via Export you can create the csv files.

BTW, if you have restitution coefficients equal to 0, then I am quite sure that CFX write the massflow information just to the output file. Simply listed. Did you check this? However, if you have a particle size distribution, CFX will give the total mass of all particles in the output file, and not by classes.

You were right, it actually is written in output file under Particle Mass Flow Summary.
You saved me a lot of time, really appreciate your help.

BR

Gert-Jan · May 20, 2019, 11:05

It is an advice I can give to everyone on this forum: read the output file.

Regs, Gert-Jan

May 18, 2019, 13:12	Particle mass calculation	#1
manut New Member Join Date: Jul 2017 Posts: 10 Rep Power: 9	Hello, I have different diameter particles stuck to a different surfaces and I would like to know what is the mass of particles that stuck to a particular surface. It's a steady simulation and I really cannot find the way to calculate it. BR

May 20, 2019, 11:05		#9
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,913 Rep Power: 28	It is an advice I can give to everyone on this forum: read the output file. Regs, Gert-Jan manut likes this.

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May 20, 2019, 04:19		#2
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,913 Rep Power: 28	May I assume that the particle exit the simulation when they hit these surfaces? Then I would go to Pre and define csv files (Output Control) with information of particles when they exit the simulation. You can add a lot of variables, including particle massflow.

May 20, 2019, 04:31		#3
manut New Member Join Date: Jul 2017 Posts: 10 Rep Power: 9	Thank you for your help. I have set surface bc in a way that these particles stuck to it as it's quite close to what really happens. Unfortunately CFX does not write info about masses as a default so I set appropriate expert parameter but now it's just impossible to set enough integer memory. I tried change alloc factor to 10 and it was not enough, still getting error either about integer memory or permission denied due to unknown reason (100 GB disk space available). I guess I need to play with Output Control. BR

May 20, 2019, 04:43		#4
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,913 Rep Power: 28	In output control, you can create histograms when particles end on a wall. Via Export you can create the csv files. BTW, if you have restitution coefficients equal to 0, then I am quite sure that CFX write the massflow information just to the output file. Simply listed. Did you check this? However, if you have a particle size distribution, CFX will give the total mass of all particles in the output file, and not by classes.

May 20, 2019, 04:48		#5
manut New Member Join Date: Jul 2017 Posts: 10 Rep Power: 9	I checked it, good that you have mentioned particle size distribution. Yes, I have different particle diameters, presumably this is the reason why it's not that straightforward to pull these data. BR

May 20, 2019, 04:54		#6
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,913 Rep Power: 28	Therefore, use the csv-files. This allows you to export the particle diameter and gives you all info you need.

May 20, 2019, 04:56		#7
manut New Member Join Date: Jul 2017 Posts: 10 Rep Power: 9	I will try that. Thank you again. BR