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Global equation expected unit
Posted 23 mar 2016, 20:57 GMT-4 Version 5.2 0 Replies
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I'm using a global equation to drive a prescribed mesh rotation.
The equation I'm using is for angular velocity. It has the form
ut = x (a long expression, with units of rad/s, as ut. all variables/parameters are correct, I've triple checked)
In global equations I have the following:
name: u (plane angle)
f(u,ut,utt): ut - x
initial value (u_0): rot_0 (parameter defining initial rotation
initial value (ut_0): 0
Dependent variable quantity: plane angle (rad)
Source term quantity: plane angle (rad)
The equation is in orange and the mouse-over tool-tip says "deduced unit is [1/s], expected is [1]"
Given that the equation is for the angular velocity, was does it not expect [1/s]? I can't see any syntax errors, and it seems logical to me that if the units of 'u' are [rad], then COMSOL knows that the units of 'ut' are [rad/s].
I've tried changing the dependent variable and source term units to angular velocity, but this doesn't help.
I feel like the solution is probably simple but I can't figure out how to fix it and the manual is no help at all. Any guidance welcome.
Hello Hugh Marman
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