The meaning of the following warning in fluent?

ebtedaei · May 9, 2018, 03:58

Dear All,
To solve the following warning in Fluent,I increased the maximum number of time steps used to compute a single particle trajectory. But the warning was not solved !!!

"" WARNING: 53.5245% of the total discrete phase mass was not tracked for the expected residence time:
0.000956 s less on a mass-weighted average (which is 0.1525% of their total age or 95.6261% of the last time step).
You may be able to reduce this discrepancy by changing the tracking parameters, that is,
increasing the maximum number of time steps used to compute a single particle trajectory. ""

Please tell me How can I solve this warning? Is there another way to solve this warning?

Best regards,
Ali

Kushal Puri · May 9, 2018, 05:58

Quote:

Originally Posted by ebtedaei

Dear All,
To solve the following warning in Fluent,I increased the maximum number of time steps used to compute a single particle trajectory. But the warning was not solved !!!

"" WARNING: 53.5245% of the total discrete phase mass was not tracked for the expected residence time:
0.000956 s less on a mass-weighted average (which is 0.1525% of their total age or 95.6261% of the last time step).
You may be able to reduce this discrepancy by changing the tracking parameters, that is,
increasing the maximum number of time steps used to compute a single particle trajectory. ""

Please tell me How can I solve this warning? Is there another way to solve this warning?

Best regards,
Ali

you try to increase the max number of steps to some higher value, as shown in image

ebtedaei · May 9, 2018, 06:40

Thanks for your response,
Sorry I has increased it up to 5000 and also to 500,000 but the warning was not solved !!!

Kushal Puri · May 9, 2018, 07:03

Quote:

Originally Posted by ebtedaei

Thanks for your response,
Sorry I has increased it up to 5000 and also to 500,000 but the warning was not solved !!!

You have the converged flow or you are converging it with DPM. If it is not converged then converge the flow first and then use DPM.

ebtedaei · May 9, 2018, 16:22

At first, I solved a converged multi-phase flow of fluids (CFD). Now I want to add particles flow (DPM) to it.

How much should I increase max. number of time steps in DPM model?

Best,
Ali

Kushal Puri · May 10, 2018, 07:29

Quote:

Originally Posted by ebtedaei

At first, I solved a converged multi-phase flow of fluids (CFD). Now I want to add particles flow (DPM) to it.

How much should I increase max. number of time steps in DPM model?

Best,
Ali

You can start with keeping no of continuous phase iteration to 500 and max no of time step to 2000.

susilonr · May 10, 2018, 13:55

Quote:

Originally Posted by ebtedaei

At first, I solved a converged multi-phase flow of fluids (CFD). Now I want to add particles flow (DPM) to it.

How much should I increase max. number of time steps in DPM model?

Best,
Ali

Did you made CFD in 3d models? If its yes.. can you tell me how to solved convergn multi-phased?
Can you tell me how to solved converged multi-phase flow? please send by email nurrahmatsusilo@gmail.com

ebtedaei · May 11, 2018, 02:20

Quote:

Originally Posted by susilonr

Did you made CFD in 3d models? If its yes.. can you tell me how to solved convergn multi-phased?
Can you tell me how to solved converged multi-phase flow? please send by email nurrahmatsusilo@gmail.com

I used different multi-phase models such as VOF or mixture and Viscous model of RSM with solution method of SIMPLE or PISO in Fluent.

What is your problem?

y.suri · July 23, 2018, 05:01

Quote:

Originally Posted by ebtedaei

Thanks for your response,
Sorry I has increased it up to 5000 and also to 500,000 but the warning was not solved !!!

Did you able to resolve this issue? I am getting a similar warning, Please suggest?

ebtedaei · July 23, 2018, 06:57

[No, I'm sorry
QUOTE=y.suri;700109]Did you able to resolve this issue? I am getting a similar warning, Please suggest?[/QUOTE]

france123 · December 4, 2018, 08:41

Quote:

Originally Posted by y.suri

Did you able to resolve this issue? I am getting a similar warning, Please suggest?

Hey everyone,
I´m facing the same problem. Has someone found a solution?
I also increased the maximum number of steps up to 50000, but still the same warning.
I try to solve a transient simulation of a sedimentation tank.
I would be happy if someone try to help me.
Best regards.

y.suri · December 4, 2018, 08:46

check your input model parameters in DPM model. Most probably double check the mass flow rate. I get rid of this warning by changing my simulation modelling parameters.
I hope it will help.

Quote:

Originally Posted by france123

Hey everyone,
I´m facing the same problem. Has someone found a solution?
I also increased the maximum number of steps up to 50000, but still the same warning.
I try to solve a transient simulation of a sedimentation tank.
I would be happy if someone try to help me.
Best regards.

Lale · May 8, 2019, 01:58

I believe the problem is related to the vast numbers of injected particle. How can I reduce them to the specified number?

May 9, 2018, 03:58	The meaning of the following warning in fluent?	#1
ebtedaei Senior Member ali Join Date: Jul 2016 Posts: 147 Rep Power: 9	Dear All, To solve the following warning in Fluent,I increased the maximum number of time steps used to compute a single particle trajectory. But the warning was not solved !!! "" WARNING: 53.5245% of the total discrete phase mass was not tracked for the expected residence time: 0.000956 s less on a mass-weighted average (which is 0.1525% of their total age or 95.6261% of the last time step). You may be able to reduce this discrepancy by changing the tracking parameters, that is, increasing the maximum number of time steps used to compute a single particle trajectory. "" Please tell me How can I solve this warning? Is there another way to solve this warning? Best regards, Ali

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
foamToTecplot360	thomasduerr	OpenFOAM Post-Processing	121	June 11, 2021 10:05
[mesh manipulation] refineMesh Error	mohsen.boojari	OpenFOAM Meshing & Mesh Conversion	3	March 1, 2018 22:07
[Gmsh] discretizer - gmshToFoam	Andyjoe	OpenFOAM Meshing & Mesh Conversion	13	March 14, 2012 04:35
Version 15 on Mac OS X	gschaider	OpenFOAM Installation	113	December 2, 2009 10:23
Can anybody help me to solve the list errors while compiling Openfoam 15 on Opensuse 103 32bit	coompressor	OpenFOAM Installation	0	November 12, 2008 19:53

May 9, 2018, 06:40		#3
ebtedaei Senior Member ali Join Date: Jul 2016 Posts: 147 Rep Power: 9	Thanks for your response, Sorry I has increased it up to 5000 and also to 500,000 but the warning was not solved !!!

May 9, 2018, 16:22		#5
ebtedaei Senior Member ali Join Date: Jul 2016 Posts: 147 Rep Power: 9	At first, I solved a converged multi-phase flow of fluids (CFD). Now I want to add particles flow (DPM) to it. How much should I increase max. number of time steps in DPM model? Best, Ali

July 23, 2018, 06:57		#10
ebtedaei Senior Member ali Join Date: Jul 2016 Posts: 147 Rep Power: 9	[No, I'm sorry QUOTE=y.suri;700109]Did you able to resolve this issue? I am getting a similar warning, Please suggest?[/QUOTE]

May 8, 2019, 01:58		#13
Lale New Member Zaha Join Date: Mar 2019 Posts: 14 Rep Power: 7	I believe the problem is related to the vast numbers of injected particle. How can I reduce them to the specified number?