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Dependent variable at a point

Posted 4 mar 2022, 06:55 GMT-5 2 Replies

Alexandra Prasinou
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Hi,

I am wondering if COMSOL allow us to calculate the value of a dependent variable at a point at which I calculated the maximum value of another variable. For example I created a maximum operator (maxop1) and I calculated the position of the maximum value of the height1 (h1) in my domain by applying: maxop1(h1,x). Then, I want to find the value of h1 and of another height, specifically h2 at the above position (x), but I do not know how to do that in COMSOL.

Thanks, Alexandra

2 Replies Last Post 4 mar 2022, 08:38 GMT-5
Magnus Ringh COMSOL Employee

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Posted: 2 years ago 4 mar 2022, 07:53 GMT-5
Updated: 2 years ago 4 mar 2022, 07:54 GMT-5

Hi Alexandra,

One way of doing this, is to add a Cut Point 2D (in 2D) or Cut Point 3D (in 3D) dataset and define that cut point (in 3D, as an example) using the following x, y, and z coordinate values:

maxop1(h1,x)
maxop1(h1,y)
maxop1(h1,z)

Then add a Point Evaluation node, and in its settings, choose the Cut Point 2D or Cut Point 3D dataset as the dataset to use, and then enter h2 in the Expression column to evaluate it at that point.

Best regards,

Magnus

Hi Alexandra, One way of doing this, is to add a **Cut Point 2D** (in 2D) or **Cut Point 3D** (in 3D) dataset and define that cut point (in 3D, as an example) using the following *x*, *y*, and *z* coordinate values: maxop1(h1,x) maxop1(h1,y) maxop1(h1,z) Then add a **Point Evaluation** node, and in its settings, choose the Cut Point 2D or Cut Point 3D dataset as the dataset to use, and then enter `h2` in the **Expression** column to evaluate it at that point. Best regards, Magnus
Alexandra Prasinou
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Posted: 2 years ago 4 mar 2022, 08:38 GMT-5

Hello Magnus,

Thank you very much for the answer!

Still I have a problem, because the position (x) where h1 is maximum changes over time and by adding a Cut Point 1D (because h1 and h2 depend only on x-coordinate) COMSOL calculates h1 and h2 at a specific point. I want to calculate my two variables, h1 and h2, at the point where maxop1(h1,x) applies, which position changes over time.

Thanks,

Alexandra

Hello Magnus, Thank you very much for the answer! Still I have a problem, because the position (x) where h1 is maximum changes over time and by adding a Cut Point 1D (because h1 and h2 depend only on x-coordinate) COMSOL calculates h1 and h2 at a specific point. I want to calculate my two variables, h1 and h2, at the point where maxop1(h1,x) applies, which position changes over time. Thanks, Alexandra

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