How to plot the temperature Vs time in CFD-post?

aicha · April 23, 2015, 11:03

Hi all,
I'm using CFD-post in Ansys Workbench to process my results. I want to plot the temperature Vs time: temperature in Y-axis and time in X -axis. But there isn't the time in the X variable list.
How can I do it?
I would greatly appreciate your help
Thank you very much

agung123 · April 25, 2015, 00:36

what kind of simulation did u do? transient or steady state?

aicha · April 25, 2015, 07:38

Hi agung123, thank you so much for reply.
Transient simulation.

CeesH · April 25, 2015, 12:08

That's because things are not stored over time by default. storing all data every timestep is a very data- and timeconsuming action, so if you want to do this you need to do this explicitly, and it is recommended only storing the things you are actually interested in.

If your mesh is small, and the number of timesteps not very large, you can get away with exporting all data. Store a datafile every so many timesteps, then you can import the whole series into CFD-post and manipulate them as desired. Check out the cornell university tutorial on transient flow past a sphere for more on this. For big meshes, or a more space-friendly manner in general, you can use one of the following options:

- if you need to store information about a certain parameter for each grid cell, use calculation activities > data export. Here you can store data every N timesteps too, for all cells you want, and only export the quantities you are interested in (such as only temperature). Select the data type of choice depending on which software package you plan to use, and also mind using node or cell data.

- if you are interested in an average, integral, sum or point value, use monitors. Set up a monitor with the quantity you want, enable the write option, and run. This is written as a text file and can be opened by any software package, from excel to Matlab or CFD-post. Note that using the monitor option, you never get a field: just a single scalar (integral, average, sum, min, max...) versus time.

aicha · April 26, 2015, 12:24

Hi Ceesh, thank you very much for reply.
I have stored the data at every time step: I have used calculation activities > Solution data export> I selected CFD-post compatible in file type and the variable is temperature but in CFD-post Ansys Workbenchin, there isn't the time in the X variable list.

April 23, 2015, 11:03	How to plot the temperature Vs time in CFD-post?	#1
aicha New Member aicha Join Date: Oct 2014 Posts: 24 Rep Power: 12	Hi all, I'm using CFD-post in Ansys Workbench to process my results. I want to plot the temperature Vs time: temperature in Y-axis and time in X -axis. But there isn't the time in the X variable list. How can I do it? I would greatly appreciate your help Thank you very much

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April 25, 2015, 00:36		#2
agung123 New Member Agung Join Date: Mar 2015 Posts: 12 Rep Power: 11	what kind of simulation did u do? transient or steady state?

April 25, 2015, 07:38		#3
aicha New Member aicha Join Date: Oct 2014 Posts: 24 Rep Power: 12	Hi agung123, thank you so much for reply. Transient simulation.

April 25, 2015, 12:08		#4
CeesH Senior Member Cees Haringa Join Date: May 2013 Location: Delft Posts: 607 Rep Power: 0	That's because things are not stored over time by default. storing all data every timestep is a very data- and timeconsuming action, so if you want to do this you need to do this explicitly, and it is recommended only storing the things you are actually interested in. If your mesh is small, and the number of timesteps not very large, you can get away with exporting all data. Store a datafile every so many timesteps, then you can import the whole series into CFD-post and manipulate them as desired. Check out the cornell university tutorial on transient flow past a sphere for more on this. For big meshes, or a more space-friendly manner in general, you can use one of the following options: - if you need to store information about a certain parameter for each grid cell, use calculation activities > data export. Here you can store data every N timesteps too, for all cells you want, and only export the quantities you are interested in (such as only temperature). Select the data type of choice depending on which software package you plan to use, and also mind using node or cell data. - if you are interested in an average, integral, sum or point value, use monitors. Set up a monitor with the quantity you want, enable the write option, and run. This is written as a text file and can be opened by any software package, from excel to Matlab or CFD-post. Note that using the monitor option, you never get a field: just a single scalar (integral, average, sum, min, max...) versus time.

April 26, 2015, 12:24		#5
aicha New Member aicha Join Date: Oct 2014 Posts: 24 Rep Power: 12	Hi Ceesh, thank you very much for reply. I have stored the data at every time step: I have used calculation activities > Solution data export> I selected CFD-post compatible in file type and the variable is temperature but in CFD-post Ansys Workbenchin, there isn't the time in the X variable list.