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Include function as a variable
Posted 25.09.2017, 10:26 GMT-4 Parameters, Variables, & Functions 1 Reply
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Hello,
I have a problem to define a variable. This is how my variable look like: y^(n-1). y is my shear rate and can also be written as “spf.sr” and n is a variable I defined already. For the function I tipped different solution in the variable expression: spf.sre(n-1) or spf.sr*e(n-1) or exp(log(spf.sr)(n-1)
All this solutions doesn’t worked and there is written "unexpected unit of input". Has somebody an idea how I can solve this problem.
Best wishes Feli
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Hi
The "unexpected unit of input" message is a warning that COMSOL cannot understand the units (or that they are missing while it expected some units. it could be your "n" that you have given units to and that you need to make unitless by a cast of the type "n[1/nunits]" or it's the log(spf.sr) as log(...) does not like units so you need to cast the spf.sr to a unitless value i.e. via a "spf.sr[s]"
Good luck
-------------------Have fun COMSOLing,
Sincerely,
Ivar