Timeline for NDSolve with Finite Element ignoring terms in partial differential equations?
Current License: CC BY-SA 4.0
11 events
| when toggle format | what | by | license | comment | |
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| Mar 21, 2019 at 9:42 | vote | accept | user3650925 | ||
| Mar 21, 2019 at 6:26 | answer | added | user21 | timeline score: 5 | |
| Mar 21, 2019 at 6:12 | comment | added | Henrik Schumacher | @user21 Thanks for the info! | |
| Mar 21, 2019 at 6:07 | comment | added | user21 | @HenrikSchumacher, yes the documentation is not quite clear on this: I have changed the sentence to "Transcient PDE in 1D, single PDE with derivatives that are second order in space OR second order in time.." That should be better. I'd need to look at why this does not give a warning but that is nothing I can fix for 12.0 | |
| Mar 21, 2019 at 0:01 | comment | added | Michael E2 |
@HenrikSchumacher It's solved as a transient PDE (see this tutorial). One can see some evidence with Head /@ sol["Coordinates"] (I used region = Line[{{0}, {1}}]).
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| Mar 20, 2019 at 23:50 | history | edited | user3650925 | CC BY-SA 4.0 |
edited title
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| Mar 20, 2019 at 13:47 | comment | added | Henrik Schumacher | Good point! Okay, I am not sure whether your use case is supposed to be covered or not. Let's ask @user21; as developer, he will definitely be able to tell. | |
| Mar 20, 2019 at 13:45 | history | edited | Henrik Schumacher |
edited tags
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| Mar 20, 2019 at 13:43 | comment | added | user3650925 | Thanks Henrik. 1) Where did you find this information in the doc. 2) And what does "...derivatives up to second order in space and arbitrary order in time" mean, in the section of the documentation that I have copy-pasted above ? | |
| Mar 20, 2019 at 12:58 | comment | added | Henrik Schumacher |
I am a bit surprised that you are not presented an error message stating that Mathemtica's FEM capabilities do not support fouth-order PDE. To my knowledge, they do not and D[f[t, x], {t, 2},{x, 2}] is a fourth order term.
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| Mar 20, 2019 at 12:31 | history | asked | user3650925 | CC BY-SA 4.0 |