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-   -   Regarding surface tracking in OpenFOAM (http://www.cfd-online.com/Forums/openfoam-post-processing/114291-regarding-surface-tracking-openfoam.html)

kulkarni Harshawardhan March 8, 2013 08:14

Regarding surface tracking in OpenFOAM
 
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


Regards
Harshawardhan Kulkarni

michielm March 9, 2013 11:25

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.

kulkarni Harshawardhan March 11, 2013 05:11

Quote:

Originally Posted by michielm (Post 412738)
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 .

wyldckat March 11, 2013 18:37

Greetings to all!

@Harshawardhan:
Quote:

Originally Posted by kulkarni Harshawardhan (Post 413052)
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: http://www.cfd-online.com/Forums/par...tml#post405615 - see post #2

Best regards,
Bruno

kulkarni Harshawardhan March 12, 2013 07:38

1 Attachment(s)
Quote:

Originally Posted by wyldckat (Post 413254)
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: http://www.cfd-online.com/Forums/par...tml#post405615 - 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

michielm March 14, 2013 11:29

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.

v_scientist March 20, 2013 07:25

why alpha value exceeds 1
 
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

kulkarni Harshawardhan March 21, 2013 13:01

Quote:

Originally Posted by v_scientist (Post 415239)
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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