Get more data points

swapnil313 · April 7, 2018, 16:13

I've attached a graph image of mass flow vs time. I would like to get more refined results before time (5e+06s) or more data points.
Is there any way to do it? without changing the timestep size

Kummi · April 10, 2018, 23:20

Hello Swapnil,
Accuracy of mesh will improve the result.
For more data points, plot the graph in preprocessing section of FLUENT and later, export the data points to acquire results.

:-)

swapnil313 · April 10, 2018, 23:22

Thank you........

Gert-Jan · April 11, 2018, 03:38

What is this Graph about? What do you see?
You plot the massflow()@outlet versus time where time goes from 0 to 3e7 [s]. This is equal to approximately 1 year. Is this realistic?
I find it hard to believe.

swapnil313 · April 11, 2018, 14:06

It's a simulation of diffusion of gas in cork over a period of a year.
The graph is good. But with more data points, the graph will be better.

Gert-Jan · April 12, 2018, 03:57

You plot the massflow at the outlet. Looking at the type of graph, I think this is created in Post. I think (!) the number of points is limited to number of transient-files you saved during the transient run. My first guess would be 12 files , 1 for each month. Because Post retrieves the data from there (I think). So if you want more data points, you need to save trn-files more frequently.

WHy don't you create a monitor plot during your run in Fluent. That would be most logical. Then you get as many points as timesteps you make

April 10, 2018, 23:22	Thank you	#3
swapnil313 New Member Swapnil Rane Join Date: Sep 2017 Posts: 23 Rep Power: 9	Thank you........

April 11, 2018, 14:06	Model	#5
swapnil313 New Member Swapnil Rane Join Date: Sep 2017 Posts: 23 Rep Power: 9	It's a simulation of diffusion of gas in cork over a period of a year. The graph is good. But with more data points, the graph will be better.

April 12, 2018, 03:57		#6
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,928 Rep Power: 28	You plot the massflow at the outlet. Looking at the type of graph, I think this is created in Post. I think (!) the number of points is limited to number of transient-files you saved during the transient run. My first guess would be 12 files , 1 for each month. Because Post retrieves the data from there (I think). So if you want more data points, you need to save trn-files more frequently. WHy don't you create a monitor plot during your run in Fluent. That would be most logical. Then you get as many points as timesteps you make Last edited by Gert-Jan; April 12, 2018 at 04:38. Reason: You are using fluent instead of CFX.

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April 10, 2018, 23:20		#2
Kummi Senior Member Kumaresh Join Date: Oct 2016 Posts: 355 Rep Power: 12	Hello Swapnil, Accuracy of mesh will improve the result. For more data points, plot the graph in preprocessing section of FLUENT and later, export the data points to acquire results. :-)

April 11, 2018, 03:38		#4
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,928 Rep Power: 28	What is this Graph about? What do you see? You plot the massflow()@outlet versus time where time goes from 0 to 3e7 [s]. This is equal to approximately 1 year. Is this realistic? I find it hard to believe.