Severe bug in unit conversion

[ahaumer@…]

Please consider the following simple example:

model Test
  Modelica.SIunits.AngularAcceleration a=10*exp(-10*time);
  Modelica.SIunits.AngularVelocity w(displayUnit="1/min", start=0, fixed=true);
  Modelica.SIunits.Angle phi(displayUnit="deg", start=0, fixed=true);
equation
  der(w)=a;
  der(phi)=w;
end Test;

The results are horribly wrong!
If I remove the "displayUnit", the absolete value of the results is correct, but the sign of phi is the opposite of the obvious solution! I'd prefer OpenModelica for my lectures, but how should I use that for teaching? I'm really upset.

[Adrian Pop]

Hi Anton, what version of OpenModelica are you using?
This should be fixed in the latest nightly builds or 1.11 beta2:
​https://openmodelica.org/download/download-windows
I fixed i recently, it was bug: #4125.

[Adrian Pop]

Seems we have issues with unit "1/min" as revolutions per minute we support "rpm" instead, see #4195.

[ahaumer@…]

I'm a few days only sporadically online.
I'm using 1.11 beta1, I'll try beta2.
With beta1 the result of angular velocity w in "rpm" is wrong, too.
And even worse: The result of angle phi is COMPLETELY wrong even if i remove both "displayUnit" (opposite sign, wrong value)!

[ahaumer@…]

Adrian you're right:
Beta 2 works fine if I'm using "rpm" instead of "1/min", this is fine for me at the moment. So this is no "blocker", I lowered the priority to "normal".

[Martin Sjölund]

Milestone moved to 1.12.0 due to 1.11.0 already being released.

[Francesco Casella]

Rescheduled to 1.14.0 after 1.13.0 releasee

[Francesco Casella]

Releasing 1.14.0 which is stable and has many improvements w.r.t. 1.13.2. This issue is rescheduled to 1.16.0

[Francesco Casella]

Retargeted to 1.17.0 after 1.16.0 release

[Francesco Casella]

Retargeted to 1.18.0 because of 1.17.0 timed release.

[Francesco Casella]

Ticket retargeted after milestone closed