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Time integration inaccuracy
Posted Jan 5, 2012, 7:51 a.m. EST 2 Replies
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I implemented time integration of the convective diffusion flux, as I learned from this forum. It works as supposed, but it is rather inaccurate, mass balance deviates ca. 10%. Then I integrated the flux out of the system (surface integration of the total flux magnitude), exported the table in Excel where I made time integration manually. Now, the mass balance agrees with less than 1% accuracy. Hence, can I improve the time integration somehow in Comsol? It would save a lot of time.
2 Replies Last Post Jan 6, 2012, 3:28 a.m. EST
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Posted:
1 decade ago
Hi
are you talking about the new v4.2a "timeint(t1,t2,expr,tol,minlen)" (see the latest help) ?
I'm using it, but I haven't really tested it carefully, as currently I do not have an easy way to check. Another way would be to new dependent variable, as per KB explanations
--
Good luck
Ivar
are you talking about the new v4.2a "timeint(t1,t2,expr,tol,minlen)" (see the latest help) ?
I'm using it, but I haven't really tested it carefully, as currently I do not have an easy way to check. Another way would be to new dependent variable, as per KB explanations
--
Good luck
Ivar
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Posted:
1 decade ago
No, I am not using 4.2a because my model built in 4.2 does not work in the new version. Mapped mesh causes an error message.
The method I use is to define an integration coupled variable and a global ODE, a note which I found here earlier.
The method I use is to define an integration coupled variable and a global ODE, a note which I found here earlier.