# How to calculate the water height | Water Surface Elevation | interFOAM

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 April 12, 2013, 18:35 How to calculate the water height | Water Surface Elevation | interFOAM #1 Member   Join Date: Oct 2012 Posts: 32 Rep Power: 7 Dear FOAMers, i made a simulation with interFoam and want to do some post-processing now. My channel is 2m long, and i want to make a diagram, where the water height (alpha = 0.5) is plotted over the channel length. I tried to play around with "Plot over Line", but this seems not to be the right approach. In a second step, i want to make a diagram of the Froude-Number along the channel. I want to define the Fr-Number as a new variable, but therefore i also need the water height. Thank you very much in advance! Best regards, Mathias

 April 14, 2013, 13:50 #2 Super Moderator   Bruno Santos Join Date: Mar 2009 Location: Lisbon, Portugal Posts: 10,123 Blog Entries: 39 Rep Power: 110 Greetings Mathias, Sorry, I don't have much time to explain, so I'll refer you to a post I made some time ago: http://www.cfd-online.com/Forums/par...tml#post405615 post #2 I think you can sort out several ideas from that post Best regards, Bruno __________________ OpenFOAM: FAQ | Getting started Forum: How to get help, to post code/output and forum guide What am I doing/planning: blog/wiki Read this before sending me PM

 April 15, 2013, 13:49 #3 Member   Join Date: Oct 2012 Posts: 32 Rep Power: 7 Dear Bruno, thank you very much for your reply! In order to have a good "recipe" for the future, i want to list the steps i performed: Make a contour of alpha1=0.5 Make a "Slice" which corresponds to the contour made above Make a spreadsheet" view and export all data as a csv-file In this file, all necessary data is included an can be visualized with GNU-Plot / Excel / whatever Thank you very much!

 April 16, 2013, 02:31 #4 Senior Member   Niels Gjoel Jacobsen Join Date: Mar 2009 Location: Deltares, Delft, The Netherlands Posts: 1,759 Rep Power: 29 Hi Mathias, You could also apply the surfaceElevation tool, which is distributed along with waves2Foam. More details can be found here: http://openfoamwiki.net/index.php/Co...rfaceElevation and download instructions here: http://openfoamwiki.net/index.php/Co...d_Installation This utility also allows for runTime sampling of the free surface, hence you can have a higher frequency in the sampling compared to the information written into the time folders. Kind regards, Niels wyldckat, Teemo and Pirlu like this.

 April 16, 2013, 08:12 #5 Member   Join Date: Oct 2012 Posts: 32 Rep Power: 7 Hi Niels, thank you very much for this intersting hint, i will try it! Best regards, Mathias

 April 20, 2013, 12:00 #6 Member   Join Date: Mar 2013 Posts: 96 Rep Power: 6 Hi to all, I follow the procedure proposed by wyldckat but when I aplly the filter Plot Selection over Time appear this error: p, li { white-space: pre-wrap; } ERROR: In /home/opencfd/OpenFOAM/ThirdParty-2.1.x/ParaView-3.12.0/VTK/Filtering/vtkTable.cxx, line 353 vtkTable (0xc3dcaa8): Column "vtkValidPointMask" must have 73 rows, but has 81. ERROR: In /home/opencfd/OpenFOAM/ThirdParty-2.1.x/ParaView-3.12.0/VTK/Filtering/vtkTable.cxx, line 353 vtkTable (0xc3dcaa8): Column "Time" must have 73 rows, but has 81. ERROR: In /home/opencfd/OpenFOAM/ThirdParty-2.1.x/ParaView-3.12.0/VTK/Filtering/vtkTable.cxx, line 353 vtkTable (0xc3dcaa8): Column "Point Coordinates (0)" must have 73 rows, but has 81. ERROR: In /home/opencfd/OpenFOAM/ThirdParty-2.1.x/ParaView-3.12.0/VTK/Filtering/vtkTable.cxx, line 353 vtkTable (0xc3dcaa8): Column "Point Coordinates (1)" must have 73 rows, but has 81. ERROR: In /home/opencfd/OpenFOAM/ThirdParty-2.1.x/ParaView-3.12.0/VTK/Filtering/vtkTable.cxx, line 353 vtkTable (0xc3dcaa8): Column "Point Coordinates (2)" must have 73 rows, but has 81. ERROR: In /home/opencfd/OpenFOAM/ThirdParty-2.1.x/ParaView-3.12.0/VTK/Filtering/vtkTable.cxx, line 353 vtkTable (0xc3dcaa8): Column "Point Coordinates (Magnitude)" must have 73 rows, but has 81. Moreover the plot of H is an horizontal line (I'm not understand this result). What is the error that appear? There is a way to plot the Froude number (or the velocity) of the front of an air bubble that move forward along the channel? thank to all

 June 28, 2014, 09:11 #7 New Member   Amir Join Date: Jan 2014 Posts: 3 Rep Power: 6 Hi everybody. I have a problem like giack,(last question). any idea would be helpful. thanks to all.

 August 16, 2014, 07:53 #8 Super Moderator   Bruno Santos Join Date: Mar 2009 Location: Lisbon, Portugal Posts: 10,123 Blog Entries: 39 Rep Power: 110 Greetings to all! @Amir: Unfortunately back then I didn't have enough time to ask giack for more information, so I have to ask you now: please provide more details, so that I can try and reproduce the same error message. Otherwise, without being able to reproduce the error, I'm not able to diagnose the problem and to provide a solution for it Best regards, Bruno __________________ OpenFOAM: FAQ | Getting started Forum: How to get help, to post code/output and forum guide What am I doing/planning: blog/wiki Read this before sending me PM

 December 9, 2015, 06:36 #9 New Member   Markus Join Date: Jul 2014 Posts: 2 Rep Power: 0 Greetings to all, I am also still facing the problem of Giack concerning the vtkTable column "Time" with the 'Plot Selection Over Time' functionality. (Using paraView 2.12.0) The error reads: vtkTable (0x548f540): Column "vtkValidPointMask" must have 569 rows, but has 570 vtkTable (0x548f540): Column "Time" must have 569 rows, but has 570 Usually the 'Plot Selection Over Time' functionality works more or less ok, but when i cancel the calculation and restart the solver for a new timeStep this problem occurs. In this case the Column "Time" of vtkTable (0x548f540) does not update to the new timeStep (1 row more than before). If i delete the last time step 'Plot Selection over Time' works fine again. Does somebody know how to update the vtktable manually for the new timStep or how to fix this error ? Best regards, Markus

December 9, 2015, 18:46
#10
Super Moderator

Bruno Santos
Join Date: Mar 2009
Location: Lisbon, Portugal
Posts: 10,123
Blog Entries: 39
Rep Power: 110
Quote:
 Originally Posted by Mastra but when i cancel the calculation and restart the solver for a new timeStep this problem occurs.
Quick question: Can you please provide more details on how I can try to reproduce this exact same error? For example, with one of OpenFOAM's tutorials?

Because I suspect that when you cancel the calculation, you might hit the Ctrl+C key combination at the exact moment the solver is still writing to disk the fields for the latest time step. The other possibility is if there is one strange unexpected error in how the solver is continuing the simulation, for example it might delete files that it should not delete. This is why I ask for more details on how to reproduce the error.

As for a way to control the time ranges: menu "Edit -> Animation Controls", if I remember correctly. The widget that appears will give you controls for changing how the time steps are performed, either based on real time, or frames or specific time steps.

March 17, 2016, 04:09
plot surfaceElevation.dat
#11
New Member

yong zhao
Join Date: Oct 2013
Posts: 5
Rep Power: 6
Hi, Niels, I am using your wave generation toolbox wave2Foam. In one of the tutorials, bejiBattjes, the surfaceElevation.dat is obtained after run. Could somebody tell me how to plot the surfaceElevation versus time ? Thank you.
Quote:
 Originally Posted by ngj Hi Mathias, You could also apply the surfaceElevation tool, which is distributed along with waves2Foam. More details can be found here: http://openfoamwiki.net/index.php/Co...rfaceElevation and download instructions here: http://openfoamwiki.net/index.php/Co...d_Installation This utility also allows for runTime sampling of the free surface, hence you can have a higher frequency in the sampling compared to the information written into the time folders. Kind regards, Niels

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