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how to plot V,p,F... in OpenFoam

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Old   May 14, 2012, 09:56
Default how to plot V,p,F... in OpenFoam
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Teemo
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Hi everyone,

I am a new user of OpenFOAM and even linux system, I just download OpenFOAM 2.1.0 and Paraview from its official website and start to learn it.

I began with the tutorials inside the package and run some simulations. My question is, take Dambreak case as example, in Paraview I could only see how the situation looks like, is there any way to plot the velocity at a fixed point against time? and what's more important, where can i find the forces vs time on the dam?

Many thanks,
T
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Old   May 14, 2012, 18:34
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Bernhard Gschaider
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Quote:
Originally Posted by Teemo View Post
Hi everyone,

I am a new user of OpenFOAM and even linux system, I just download OpenFOAM 2.1.0 and Paraview from its official website and start to learn it.

I began with the tutorials inside the package and run some simulations. My question is, take Dambreak case as example, in Paraview I could only see how the situation looks like, is there any way to plot the velocity at a fixed point against time? and what's more important, where can i find the forces vs time on the dam?

Many thanks,
T
I'll give you just the buzzwords because there are enough discussions about this on the forum:

Velocity at point: look for the "probes" functionObject here on the forum
Forces: there is a "forces"-functionObject. I'm not sure how well it plays with interFoam.
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Old   May 15, 2012, 04:45
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Teemo
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Hello Gschaider,

I have tried to add force function in ControlDict file but it did not work since it was said that
error:keyword nu is undefined in dictionary
I did some search in this forum and it seems that there's some other guy have the same problem.
Do you have any idea about how to solve it?

Regards,
T
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Old   May 15, 2012, 06:21
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Bernhard Gschaider
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Quote:
Originally Posted by Teemo View Post
Hello Gschaider,

I have tried to add force function in ControlDict file but it did not work since it was said that
error:keyword nu is undefined in dictionary
I did some search in this forum and it seems that there's some other guy have the same problem.
Do you have any idea about how to solve it?

Regards,
T
I'm afraid forces only works for non-multiphase-solvers (it tries treating interFoam as an incompressible solver and fails). Either someone programmed a interFoces-function object (I'm not aware of that but look around. It is not a totally excentric application) or you'll have to do it yourself. One possibility would be using the patchExpression-functionObject of swak4Foam which allows evaluating arbitrary expressions (as long as the fields exist) on patches. I describe that on slide 77 of http://www.openfoamworkshop.org/6th_...der_slides.pdf
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