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addition / subtraction of derived values
Posted 21 juin 2017, 10:25 UTC−4 2 Replies
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Dear community,
I'm facing a problem where I'm pretty sure there exists an easy solution, anyway I couldn't find it yet and it's driving me nuts:
I want to calculate line integrals over different edges and then add them together to gain the integration over the whole enclosing surface. The problem is that my integrand has different coefficients for different edges, that's why I can't simply apply the same integral on all edges.
So what I'm searching for is combining my solutions to a new variable.
Any ideas?
thank you in advance!
I'm facing a problem where I'm pretty sure there exists an easy solution, anyway I couldn't find it yet and it's driving me nuts:
I want to calculate line integrals over different edges and then add them together to gain the integration over the whole enclosing surface. The problem is that my integrand has different coefficients for different edges, that's why I can't simply apply the same integral on all edges.
So what I'm searching for is combining my solutions to a new variable.
Any ideas?
thank you in advance!
2 Replies Last Post 13 juil. 2017, 08:23 UTC−4
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Posted:
7 years ago
Updated:
7 years ago
Hi Martin,
One option for you is to define Component Couplings of the Integration type (Read more on this in other threads). Since you have presumably already solved your model at this point, you can avoid re-solving it while still making the components couplings available for postprocessing by using "Update Solution" (not "Solve") in the Study node. Now your integrals have names so you can do all the integrations/subtractions you want on them.
Alternatively, you could use the same name for several variables defined on the various edges by different expressions, and then use the machinery you are familiar with to compute the integral of that. Here again, if you don't want to re-solve the model but you do want variables added after you solved the model to be accessible in postprocessing, use "Update Solution".
Jeff
Edit: I am attaching a file demonstrating the second approach. myvar is defined as T on the bottom and left boundaries and as -T on the top and right boundaries. As a result the integral of myvar computes the integral of T on the bottom and left sides minus the integral of T on the right and top side.
One option for you is to define Component Couplings of the Integration type (Read more on this in other threads). Since you have presumably already solved your model at this point, you can avoid re-solving it while still making the components couplings available for postprocessing by using "Update Solution" (not "Solve") in the Study node. Now your integrals have names so you can do all the integrations/subtractions you want on them.
Alternatively, you could use the same name for several variables defined on the various edges by different expressions, and then use the machinery you are familiar with to compute the integral of that. Here again, if you don't want to re-solve the model but you do want variables added after you solved the model to be accessible in postprocessing, use "Update Solution".
Jeff
Edit: I am attaching a file demonstrating the second approach. myvar is defined as T on the bottom and left boundaries and as -T on the top and right boundaries. As a result the integral of myvar computes the integral of T on the bottom and left sides minus the integral of T on the right and top side.
Attachments:
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Posted:
7 years ago
Thank you Jeff,
your first advice worked like a charm!
wishes, Martin
your first advice worked like a charm!
wishes, Martin