inStream ignores min/max modifiers on stream connector flow variables

[palm86@…]

I might be mistaken, but simple tests so far seem to confirm that OpenModelica does not currently take min/max modifiers of flow variables in stream connectors into account in order to simplify expressions for inStream.

Consider the following simple scheme:

A (volume) -> B (flow) -> C (volume)

If it is known that the flow direction will always be from A to C, one can declare the connector for A as:

AdvectionPort adv(q(max=0)) supposing that q is the flow variable of a stream connector defined in AdvectionPort

Similarly, the connector for C could be:

AdvectionPort adv(q(min=0)).

However, this does not seem to influence the equations generated when the model is flattened. That is, expressions such as

smooth(0, if A.adv.q > 0.0 then ...);
smooth(0, if C.adv.q > 0.0 then ...);

are still generated, even though it is asserted that A.adv.q > 0.0 will always be false and C.adv.q > 0.0 will always be true.

[Per Östlund]

Fixed in 6f28e41/OMCompiler.

[palm86@…]

Thanks for the ultraquick fix. Will this be available in the Ubuntu nightly repo?

[Per Östlund]

Replying to palm86@…:

Thanks for the ultraquick fix. Will this be available in the Ubuntu nightly repo?

It should, assuming that the nightly builds are ok. Adding Martin as Cc in case he has something to say about the nightly builds.

[Martin Sjölund]

No, the nightly builds are not up yet.

[palm86@…]

Is there an issue on trac that I can follow to know when the nightly builds are up again?

[Martin Sjölund]

Not that I know of.

[Dietmar Winkler]

It doesn't make sense to keep closed ticket in the "Future" milestone that were simply forgotten to assign to the correct milestone in the past.

[Martin Sjölund]

Removing the pre1.9.4 milestone in favor of 1.9.4.