Changes between Initial Version and Version 2 of Ticket #5298


Ignore:
Timestamp:
2019-01-25T10:59:22Z (6 years ago)
Author:
Francesco Casella
Comment:

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  • Ticket #5298 – Description

    initial v2  
    1 Please check [https://libraries.openmodelica.org/branches/newInst/Modelica_trunk/files/Modelica_trunk_Modelica.Fluid.Examples.TraceSubstances.RoomCO2.sim Modelica.Fluid.Examples.TraceSubstances.RoomCO2]. The simulation fails after about 20 seconds. Analysis of the transient reveals that the temperature in the volume unexpectedly increases above 300 degC, while it is supposed to remain roughly constant trhough the transient, which mainly involves the concentration of CO2.
     1Please check [https://libraries.openmodelica.org/branches/newInst/Modelica_trunk/files/Modelica_trunk_Modelica.Fluid.Examples.TraceSubstances.RoomCO2.sim Modelica.Fluid.Examples.TraceSubstances.RoomCO2]. The simulation fails after about 20 seconds. Analysis of the transient reveals that the temperature in the volume unexpectedly increases above 300 degC, while it is supposed to remain roughly constant throughout the transient, which mainly involves the concentration of CO2.
    22
    33Further analysis of the {{{-d=optdaedump}}} output reveals that in the process of changing the state variables from {{{volume.m, volume.U}}} to {{{volume.medium.p, volume.medium.T}}}, carried out via the Pantelides algorithm, when the flattening is carried out by NF, the backend computes