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smooth function

Posted Sep 27, 2010, 5:50 p.m. EDT 2 Replies

Yishan Zhang
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Hi everyone,

I want to construct a smooth function about the following situation,

the reaction rate is equal to k*c

the initial c = 1000, when c = 0, the reaction rate = 0.

how to use "flc1hs" to define the smooth function?

Thanks,

Yishan
2 Replies Last Post Sep 28, 2010, 1:30 a.m. EDT
Manohar Gottapu
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Posted: 1 decade ago Sep 27, 2010, 11:57 p.m. EDT
I think you just need to use a condition (c>0) to stop reaction in your model. Type k*c*(c>0) and it will do the job.
I think you just need to use a condition (c>0) to stop reaction in your model. Type k*c*(c>0) and it will do the job.
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Sep 28, 2010, 1:30 a.m. EDT
Hi

in V4 you have the step and pluse functions in the model definitions

in V4 you need to call the heaviside functions as you propose, there are aseveralé threads about this on the forum, and try search your doc for "flc1hs(" (without the "")

--
Good luck
Ivar
Hi in V4 you have the step and pluse functions in the model definitions in V4 you need to call the heaviside functions as you propose, there are aseveralé threads about this on the forum, and try search your doc for "flc1hs(" (without the "") -- Good luck Ivar

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