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Piecewise function
Posted Jul 19, 2012, 12:23 p.m. EDT Version 3.5a, Version 4.2a 2 Replies
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Hi, Forum,
I tried two ways for specifying time varying mass flux boundary condition and got different results.
In the first way, I specify it directly as
6000*(t>=0[d]&&t<50[d])+4000*(t>=50[d] && t<75[d])
In the second way, I specify it using a piecewise function func
Start End Function
0 50 6000
50 75 4000
and then use func(t]1/d]) in the mass flux text field.
I wonder if someone has encountered this problem before.
Thanks.
I tried two ways for specifying time varying mass flux boundary condition and got different results.
In the first way, I specify it directly as
6000*(t>=0[d]&&t<50[d])+4000*(t>=50[d] && t<75[d])
In the second way, I specify it using a piecewise function func
Start End Function
0 50 6000
50 75 4000
and then use func(t]1/d]) in the mass flux text field.
I wonder if someone has encountered this problem before.
Thanks.
2 Replies Last Post Apr 20, 2014, 10:54 a.m. EDT
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Posted:
1 decade ago
Well. I figured out the answer to my prev post. By default, COMSOL extrapolates for the whole simulation range. So must provide explicit values for all time periods.
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Posted:
1 decade ago
HI Forum;
I need a help about how to solve a problems with piecewise functions proprieties in comsol 3.5a version
Thanks for the help.
I need a help about how to solve a problems with piecewise functions proprieties in comsol 3.5a version
Thanks for the help.