v1.4.1

Created Freitag 02 März 2018

This release is planned for September 2019

Improved simulation speed and back flow conditions during initialization (Added pressure states to furnace components)
Improved roboustness of simulation of zero flows
New mill model based on physical equations.
New asserts preventing users to parametrize discretized pipe geometry to have geodetic height bigger than length and to make sure that sum discrete cell length is equal to sum of total length
Improved affinity pumps and compressor models to capture change of properties at the inlet and added option for defining hydraulic characteristic with head vs. volumetric flow rate
Lots of minor changes which improve usability of ClaRa
Lots of minor changes which make models more robust and widen the scope of application

SteamPowerPlant_01 example was bugfixed, in several cases discretized lengths of cells exceeded total length of a pipe

Detailed Release Notes

SteamPowerPlant_01 example improved (faster/more stable), now introduced pressure state in burner and flame room components

torque characteristic depending on rotational speed now depends on voltage of AsynchronousMotor_L2 (changed from torque breakdown)

PumpVLE L1 affinity, CompressorGas L1 affinity improved to capture change of properties at the inlet and added option for defining hydraulic characteristic with head vs. volumetric flow rate for affinity pumps and compressor models

Improvement of VolumeVLE L4 Advanced (more roboust simulations especially of zero flows)
pressure and mass flow states at inlet/outlet connectors (if frictionAtInlet/frictionAtInlet = true)
oscillations surpression at inlet/outlet halfcells (if frictionAtInlet/frictionAtInlet = true)
enthalpy at inlet/outlet connectors calculated at first/last energy cell (for negative flows) or at inStream of first/last energy cell (for positive flows) or as as averaged of both previous cases (for "very small (zero)" flows)
- This allows to avoid chattering during zero flows due to avoiding usage of actualStream
Pressure difference due to convection is computed from the momentum carried by the mass flows:
- at the flow cell boundaries (using averaged velocitiy from flow cell boundaries) or
- at upstream (using upstream velocity at flow cell state location) or
- located somewhere in between flow cell boundaries

defined by user in Expert Settings dialog using

parameter.

User shall primarly use this component for investigating zero flows
User shall primarly use L3 adjacent components in order to satisfy regular staggared disretization scheme.
If connected to L1/L2 components this can lead to large non-linear systems. To improve it:
- disable frictionAtInlet/frictionAtInlet (this will remove pressure and mass flow states at connectors) when adjacent L1/L2 components has pressure drops at inlet/outlet
- use linear pressure drops at adjacent L1/L2 components (rather than quadratic)
- disable pressure suppression terms (this will remove pressure states at connectors)
- when connected to pressure sink with variable inlet pressure with abrupt (sudden) step change, use CombiTimeTable, otherwise Dymola cannot differentiate or crashes at step change

A physical mill PhysicalMills based on physical equations to model dynamic operation behavior.