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Regarding surface tracking in OpenFOAM

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Old   March 8, 2013, 08:14
Exclamation Regarding surface tracking in OpenFOAM
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Harshawardhan
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hello friends,

I want track inter phase in OpenFOAM means I want find out how the alpha(phase fraction) changes at interphase between two fluids .
How should I do this????

Please help me


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Harshawardhan Kulkarni
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Old   March 9, 2013, 11:25
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Michiel
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If you use paraview for post-processing you can very easily just plot the alpha1 field and find out where the boundary between 0 and 1 is.

If you want to just track alpha1=0.5 for example you could also sample it.
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Old   March 11, 2013, 05:11
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Quote:
Originally Posted by michielm View Post
If you use paraview for post-processing you can very easily just plot the alpha1 field and find out where the boundary between 0 and 1 is.

If you want to just track alpha1=0.5 for example you could also sample it.


thanks for quick reply....

Can you tell me....... I have to used "plot data "or "Plot over line" in a filter in

paraview........And if I used "plot data" and plot generated after that how I can extract

that data in a column wise manner so that we can use the information for further

processing .
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Old   March 11, 2013, 18:37
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Bruno Santos
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wyldckat is just really nicewyldckat is just really nicewyldckat is just really nicewyldckat is just really nice
Greetings to all!

@Harshawardhan:
Quote:
Originally Posted by kulkarni Harshawardhan View Post
thanks for quick reply....

Can you tell me....... I have to used "plot data "or "Plot over line" in a filter in

paraview........And if I used "plot data" and plot generated after that how I can extract

that data in a column wise manner so that we can use the information for further

processing .
I'm not sure if I understand what you want to do, but perhaps the instructions on the following link can give you at least some ideas on what you can do with ParaView: Temporal Analysis - see post #2

Best regards,
Bruno
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Old   March 12, 2013, 07:38
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Quote:
Originally Posted by wyldckat View Post
Greetings to all!

@Harshawardhan:

I'm not sure if I understand what you want to do, but perhaps the instructions on the following link can give you at least some ideas on what you can do with ParaView: Temporal Analysis - see post #2

Best regards,
Bruno

hello
here I'm attaching the Image, I want track the interface. I have captured that image at 25th sec. at that time I want to find out all the coordinate at interface separating two fluid.
Red: oil
blue : air
and there is line or curve (white) separating them
means want to fine out coordinates of all the alpha (0<alpha<1)



reply asap

Regards
Harshawardhan
Attached Images
File Type: jpg sessiledrp.jpg (26.6 KB, 50 views)
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Old   March 14, 2013, 11:29
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First of all: you have a value of alpha1 large than 1 in your domain. This is obviously unphysical so I suggest you look into the 'limit' you use for your contact angle BC (i recommend limit gradient)

Second I think you it would help you a lot to look into the documentation of Paraview a bit to figure out yourself what you can do.
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Old   March 20, 2013, 07:25
Exclamation why alpha value exceeds 1
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Hello everyone,
I am solving a multiphase case using interfoam. but during solving my alpha value exceeds 1 . how should i limit alpha value within 0 to 1 interval . what is the exact reason of it to increase beyond 1 or decrease beyond 0 .?? plz Help
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Old   March 21, 2013, 13:01
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Quote:
Originally Posted by v_scientist View Post
Hello everyone,
I am solving a multiphase case using interfoam. but during solving my alpha value exceeds 1 . how should i limit alpha value within 0 to 1 interval . what is the exact reason of it to increase beyond 1 or decrease beyond 0 .?? plz Help



Use Rescale to Data range
the path is Display-> (in front) of color by
at initially before the play for alpha
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