Initialization issues due to directional derivatives.

[chria]

PyFMI and QSS runs fail for some models built with directional derivative support, aborting with no error message during FMU initialization:

DataCenterContinuousTimeControl DataCenterDiscreteTimeControl SimpleHouse SimpleHouseDiscreteTime

[DeadParrot]

Versions

The issue was observed with these component versions (may occur with others):

Component	Version	Date
OCT	OCT-r23206_JM-r14295	2021/05
Buildings	9c37781	2021/05/04
QSS	e4a0f62	2021/06/08

Build

Build the FMU with bld from the OCT directory as described in the Status page.

Run

Run the models with PyFMI or QSS from a console configured as described in the Status page.

PyFMI: Use run under the model OCT directories to generate the CVode simulation.

QSS: Use run under the model QSS directory in a method subdirectory such as QSS2.

[DeadParrot]

With a more recent OCT version the PyFMI simulation of the DataCenterContinuousTimeControl, DataCenterDiscreteTimeControl, and SimpleHouse FMUs built with directional derivative support run to completion.

Component	Version	Date
OCT	OCT-r26747_JM-r14295	2021/12/15
Buildings	73ff5b8	2021/12/23

The early part of the two DataCenter simulations differ from the prior results without directional derivatives enabled, having somewhat "noisier" trajectories before settling down.

SimpleHouseDiscreteTime will not run with this newer Buildings library.

I am leaving this issue open pending testing on the other models and with the revamped QSS under development.

[DeadParrot]

With the OCT dev build OCT-dev-cw-5212-18478f3488ff1272c52222a29d72215983eadeec the same three models (updated from the latest Buildings Library) still build and run cleanly with directional derivative support.

Given the current lack of models known to have problems with directional derivative support enabled I am closing this Issue.

Any problems with the simulation trajectories/stability of the DataCenter models will be addressed in a separate Issue if needed.