# Time Chart of Surface Elevation

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 July 15, 2008, 07:14 Time Chart of Surface Elevation #1 MAB Guest   Posts: n/a I have generated Water Waves , Now i want to create a chart of surface elevation against time(containing all time steps). Any suggestion 'll be appreciated. Thanks Izil likes this.

 July 15, 2008, 13:54 Re: Time Chart of Surface Elevation #2 UnderwaterAlex Guest   Posts: n/a If I understand you correctly, in Post you could create an isosurface with at water.volume fraction = 0.5, then create an expression that finds the maximum value of a given coordinate of that isosurface (for instance: maxval(y)Isosurface 1). You could then create a chart which plots this expression as a function of time. This will only have the timesteps which you have saved along the way. If you wanted this for every step using a monitor point in the solver, you have to try something else because I don't think you can make an isosurface location reference in Pre. Hope that helps, -Alex engrmansoor2534 and Izil like this.

 July 15, 2008, 22:40 Re: Time Chart of Surface Elevation #3 Glenn Horrocks Guest   Posts: n/a Hi, If you want a monitor point you can either output the volume fraction at a number of points and you can see the free surface move that way, or more precision can be gained by integrating the volume fraction over a surface or volume. As the free surface moves up and down the total integral will move. Glenn Horrocks

 July 16, 2008, 08:09 Re: Time Chart of Surface Elevation #4 MAB Guest   Posts: n/a Hi Alex, I tried this but nothing is appearing on the chart...

 July 16, 2008, 08:13 Re: Time Chart of Surface Elevation #5 MAB Guest   Posts: n/a Hi Glenn H. Could you please explain how to integrate the volume fraction over a surface or volume. As free surface moves up and down on any particular vertical line or plane. What i want is to plot the position of free surface over that particular line/Plane against time. i need few more tips to achieve this task. Thanks

 July 16, 2008, 08:21 Re: Time Chart of Surface Elevation #6 MAB Guest   Posts: n/a hi Alex. i have created isosufrace 1 . and then maxVal(y)@surface1 gives its maximum value but when i tried to plot it against time. i chosed option of expression then selected this expression .. but nothing appeared on chart..

 July 16, 2008, 09:29 Re: Time Chart of Surface Elevation #7 MAB Guest   Posts: n/a hi Alex , I managed to generate the plot of maxVal(y)@surface1 by pressing the refresh button on top. but this graph only show the maximum value at each time interval. while i am looking for a whole free surface probile at a particular position( which could be a line) any more tips ??

 July 17, 2008, 01:58 Re: Time Chart of Surface Elevation #8 Glenn Horrocks Guest   Posts: n/a Hi, Have a look at some of the CFX-Post tutorial examples. To get the free surface level, define a boundary surface and calculate areaInt(Water.Volume Fraction)@Surface Name/area()@Surface Name. This will give you the % of the surface covered by water. You can work out the water height based on the dimensions of the surface from there. You can also do this on a line object to give you the level at a point but I think this will only work in CFX-Post. If you want to use a monitor point it has to be the surface method. Glenn Horrocks

 July 23, 2008, 05:37 Re: Time Chart of Surface Elevation #9 MAB Guest   Posts: n/a Hi Alex.. your method works fine. But i need little more tip as i want to plot the height of free surface at some particular distance x (horizontal)

 July 29, 2008, 06:10 Re: Time Chart of Surface Elevation #10 MAB Guest   Posts: n/a is it possible to get an intersection of Isosurface of water.volume Fraction(0.5) with a solicing plane in the domain. if yes then it would be the easiest way to achieve this time chart. please suggest something. thanks

 February 27, 2016, 18:45 generate waves #11 New Member   Halil İbrahim Yamaç Join Date: Dec 2015 Posts: 1 Rep Power: 0 https://www.youtube.com/watch?v=zttTAcO1S6I from this link