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A haze about "Coefficient Form PDE" in the V4.0a documentation.
Posted Oct 6, 2010, 4:10 a.m. EDT 2 Replies
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Hello, everyone
There is a haze about "Coefficient Form PDE" in the V4.0a documentation.
The equation in "Coefficient Form PDE" in Comsol program is shown in 1.jpg below, and that in documentation is shown in 2.jpg below. There is obvious different between them. So which is wrong ? the program, the documentation or the documentation not fiting the version ? Specially, there is not a coefficient of "u" in the program (1.jpg). The term is the last term of the left in the equation. I guess having-not-coefficient there is disadvantageous to build equations in practice.
thanks!
youf.
There is a haze about "Coefficient Form PDE" in the V4.0a documentation.
The equation in "Coefficient Form PDE" in Comsol program is shown in 1.jpg below, and that in documentation is shown in 2.jpg below. There is obvious different between them. So which is wrong ? the program, the documentation or the documentation not fiting the version ? Specially, there is not a coefficient of "u" in the program (1.jpg). The term is the last term of the left in the equation. I guess having-not-coefficient there is disadvantageous to build equations in practice.
thanks!
youf.
2 Replies Last Post Oct 6, 2010, 6:21 a.m. EDT
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Posted:
1 decade ago
Hi,
There should be an "a" in front of "u" in the last term on the left side of the equation. This is a display bug in the version 4.0a GUI, and it has been fixed in the upcoming version 4.1. The equation in the documentation is correct and is the one that COSMOL solves. You can specify the absorption coefficient a, and it will be used as expected even if it's missing from the displayed equation.
Best regards,
Magnus Ringh, COMSOL
There should be an "a" in front of "u" in the last term on the left side of the equation. This is a display bug in the version 4.0a GUI, and it has been fixed in the upcoming version 4.1. The equation in the documentation is correct and is the one that COSMOL solves. You can specify the absorption coefficient a, and it will be used as expected even if it's missing from the displayed equation.
Best regards,
Magnus Ringh, COMSOL
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Posted:
1 decade ago
Magnus Ringh
Thanks for your answer! I wish Comsol to get better and stronger!
youf.
Thanks for your answer! I wish Comsol to get better and stronger!
youf.