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Time Chart of Surface Elevation

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Old   July 15, 2008, 07:14
Default Time Chart of Surface Elevation
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MAB
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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
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Old   July 15, 2008, 13:54
Default Re: Time Chart of Surface Elevation
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UnderwaterAlex
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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
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Old   July 15, 2008, 22:40
Default Re: Time Chart of Surface Elevation
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Glenn Horrocks
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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
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Old   July 16, 2008, 08:09
Default Re: Time Chart of Surface Elevation
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MAB
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Hi Alex, I tried this but nothing is appearing on the chart...
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Old   July 16, 2008, 08:13
Default Re: Time Chart of Surface Elevation
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MAB
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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
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Old   July 16, 2008, 08:21
Default Re: Time Chart of Surface Elevation
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MAB
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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..
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Old   July 16, 2008, 09:29
Default Re: Time Chart of Surface Elevation
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MAB
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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 ??
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Old   July 17, 2008, 01:58
Default Re: Time Chart of Surface Elevation
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Glenn Horrocks
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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
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Old   July 23, 2008, 05:37
Default Re: Time Chart of Surface Elevation
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MAB
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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)
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Old   July 29, 2008, 06:10
Default Re: Time Chart of Surface Elevation
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MAB
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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
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