# How to monitor a property at a certain set of coordinates??

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 February 16, 2010, 21:30 How to monitor a property at a certain set of coordinates?? #1 Member   Behrang Asgharian Join Date: Oct 2009 Posts: 38 Rep Power: 8 Guys! During an unsteady iteration, how can I get the property (T,P,...) at certain x,y and draw a plot of it versus time? I have used Monitors-Surface in Solve menu but that gives me the integral of a property over an area. Thanks

 February 17, 2010, 02:00 #2 Super Moderator     Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,145 Rep Power: 32 create points (surface/points), and then solve/monitor (choose vertex average) __________________ In memory of my friend Hervé: CFD engineer & freerider

 February 17, 2010, 03:10 #3 Member   Behrang Asgharian Join Date: Oct 2009 Posts: 38 Rep Power: 8 Thanks I'll give it a try.

 February 18, 2010, 00:28 #4 Member   Behrang Asgharian Join Date: Oct 2009 Posts: 38 Rep Power: 8 Thanks a million. It worked!! Can I ask you another question? How can I have a variable initial condition like a sinusoidal pressure throughout the domain I mean for example p=p(x)? How can we have variable body force throughout the domain? Last edited by behrang2009; February 18, 2010 at 00:44.

 February 18, 2010, 02:06 #5 Super Moderator     Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,145 Rep Power: 32 if you mean a BC with a sinusoidal signal, you can use a profile or UDF __________________ In memory of my friend Hervé: CFD engineer & freerider

 February 18, 2010, 02:52 #6 Member   Behrang Asgharian Join Date: Oct 2009 Posts: 38 Rep Power: 8 I mean how I can put the pressure sinusoidally on the cells throughout the domain. Take a narrow tube for example that pressure changes along x axis but constant at every cross section. I want to use this as an initial condition and let the flow oscillate. I have used UDF in a different way (DEFINE_PROFILE) and kind of got what I wanted. I wonder if we can impose such an initial condition on the cells or not. DEFINE_PROFILE is used for faces. Is there any Macro that we can use for the domain? Thanks

 February 18, 2010, 03:01 #7 Super Moderator     Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,145 Rep Power: 32 no idea, sorry. __________________ In memory of my friend Hervé: CFD engineer & freerider

 March 2, 2010, 22:48 #8 Member   Behrang Asgharian Join Date: Oct 2009 Posts: 38 Rep Power: 8 Hi Again! Since you helped last time, I think you know the answer to the following question of mine: I am modeling oscillating flow which is naturally unsteady. I need to integrate some field functions over one period T. In what menu can I such an option? Thanks Good luck Behrang

 March 3, 2010, 01:59 #9 Super Moderator     Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,145 Rep Power: 32 I never did that, but if you check the help, something may help you. ******** 25.17.4 Postprocessing for Time-Dependent Problems: The postprocessing of time-dependent data is similar to that for steady-state data, with all graphical and alphanumeric commands available. You can read a data file that was saved at any point in the calculation (by you or with the autosave option) to restore the data at any of the time levels that were saved. FLUENT will label any subsequent graphical or alphanumeric output with the time value of the current data set. If you save data from the force or surface monitors to files (see step 5 in Section 25.17.1), you can read these files back in and plot them to see a time history of the monitored quantity ... If you enabled the Data Sampling for Time Statistics option in the Iterate panel, FLUENT will compute the time average (mean) of the instantaneous values and root-mean-squares of the fluctuating values sampled during the calculation. The mean and root-mean-square (RMS) values for all solution variables will be available in the Unsteady Statistics... category of the variable selection drop-down list that appears in postprocessing panels. You can set the Sampling Interval such that Data Sampling for Time Statistics can be performed at the specified frequency __________________ In memory of my friend Hervé: CFD engineer & freerider

 March 3, 2010, 19:04 #10 Member   Behrang Asgharian Join Date: Oct 2009 Posts: 38 Rep Power: 8 Thanks You mean FFT in the plot menu?

 March 4, 2010, 02:29 #11 Super Moderator     Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,145 Rep Power: 32 I don't believe it is FFT (I don't have Fluent anymore, so I can't check) __________________ In memory of my friend Hervé: CFD engineer & freerider

 March 4, 2010, 02:49 #12 Member   Behrang Asgharian Join Date: Oct 2009 Posts: 38 Rep Power: 8 thanks anyway

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