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Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

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Cut Point 3D Point Evaluation

Posted 2012年3月1日 GMT-5 11:18 Geometry, Results & Visualization Version 4.2a 5 Replies

Ross Clarke
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Hi there

I am trying to obtain data for a point on my model that is not directly defined within the geometry. I have used the "Cut Point 3D" to add a point on my model, then I was going to use the "Point Evaluation" option to find the data at this point.

However, after defining the 3D point, and plotting it on my geometry, I am unable to select it in the point evaluation option. How do I ensure that the point has been created?

Thanks for your help!

Ross
5 Replies Last Post 2013年4月5日 GMT-4 03:03
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 2012年3月1日 GMT-5 14:35
Hi

no point is "created" but a Data set structure with all variables interpolated to the geometrical point you defined. So you then access the data set as a Point Graph pointing to the given data set to "see" the values, or you apply an operator to it or wahtever

--
Good luck
Ivar
Hi no point is "created" but a Data set structure with all variables interpolated to the geometrical point you defined. So you then access the data set as a Point Graph pointing to the given data set to "see" the values, or you apply an operator to it or wahtever -- Good luck Ivar
Ram B
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Posted: 1 decade ago 2013年4月4日 GMT-4 11:59
I have a question that is very similar to that originally asked.

I have created 2 cut point 3D data sets. Essentially I am interested in looking at the voltage values at the 2 points. These points are not part of the geometry. In my derived values section, I create point evaluations for the 2 points. I can evaluate the point evaluations and look at the voltage values at the points individually. Now I am interested in looking at the potential difference between the 2 points. How do I do that? Obviously, I do not want to do the subtraction manually.

Thanks
I have a question that is very similar to that originally asked. I have created 2 cut point 3D data sets. Essentially I am interested in looking at the voltage values at the 2 points. These points are not part of the geometry. In my derived values section, I create point evaluations for the 2 points. I can evaluate the point evaluations and look at the voltage values at the points individually. Now I am interested in looking at the potential difference between the 2 points. How do I do that? Obviously, I do not want to do the subtraction manually. Thanks
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 2013年4月4日 GMT-4 17:29
Hi

the best is to make them part of the geometry, and then define variables on them in the Model Definitions Variable node(s)

--
Good luck
Ivar
Hi the best is to make them part of the geometry, and then define variables on them in the Model Definitions Variable node(s) -- Good luck Ivar
Magnus Ringh COMSOL Employee

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Posted: 1 decade ago 2013年4月5日 GMT-4 02:58
Hi,

You can also use a Join data set where you use the first Cut Point 3D data set as Data 1 and the second Cut Point 3D data set as Data 2, and then use Difference as the combination method. Evaluating the Join data set as a Point Evaluation then gives you the potential difference between the voltages in the two points.

Best regards,
Magnus Ringh, COMSOL
Hi, You can also use a Join data set where you use the first Cut Point 3D data set as Data 1 and the second Cut Point 3D data set as Data 2, and then use Difference as the combination method. Evaluating the Join data set as a Point Evaluation then gives you the potential difference between the voltages in the two points. Best regards, Magnus Ringh, COMSOL
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 2013年4月5日 GMT-4 03:03
Hi Magnus

that's a possibility I often forget about, good point ;)

--
Good luck
Ivar
Hi Magnus that's a possibility I often forget about, good point ;) -- Good luck Ivar

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