NEPCE - a nearly energy-preserving coupling element for weak-coupled problems and co-simulations
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Inclou dades d'ús des de 2022
Cita com:
hdl:2117/192675
Tipus de documentText en actes de congrés
Data publicació2013
EditorCIMNE
Condicions d'accésAccés obert
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Abstract
Application of the weak-coupled or non-iterative co-simulation approach is
very popular in industry because of its simple synchronisation scheme of the involved
subsystems, even though there are some significant drawbacks. The main problems are
obvious: On the one hand the explicit character of this coupling strategy may lead to
instability of the overall system solution and on the other hand the selection of an appropriate
coupling step-size is challenging. Investigation of the weak-coupling effects is
necessary to improve the performance as well as the usability of this coupling approach.
Concerning non-iterative co-simulation, subsystems are solved once over coupling time
steps and in the general case of bidirectional dependencies between subsystems, several
coupling quantities are unknown. This requires some kind of extrapolation, leading to an
explicit character of the weak coupling approach. If small coupling step sizes have to be
applied, this strategy leads to a significant increase of overall simulation time.
In this work we analyse the coupling process as a standalone subsystem and on this basis
we present a novel coupling strategy. From an energy flow point of view this strategy
considers the transmission of generalised energy between coupled subsystems and ensures
(nearly) energy conservation in the coupled overall system. Thus, this modified couplingprocess
is referred to as nearly energy-preserving coupling element (NEPCE). Besides the
fundamental theory some examples demonstrate the improved performance of the weak
coupling scheme leading to more accurate simulation results and to a reduced amount of
simulation time as well.
ISBN978-84-941407-6-1
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Coupled-2013-91_Nepce -a nearly energy.pdf | 816,9Kb | Visualitza/Obre |