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In engineering, it is a common desire to couple existing simulation toolstogether into one big system by passing information from subsystems asparameters into the subsystems under influence. As executed at fixed timepoints, this data exchange gives the global method a strong explicit component,and as flows of conserved quantities are passed across subsystem boundaries, itis not ensured that systemwide balances are fulfilled: the system is not solvedas one single equation system. These balance errors can accumulate and makesimulation results inaccurate. Use of higher-order extrapolation in exchangeddata can reduce this problem but cannot solve it. The remaining balance errorhas been handled in past work with balance correction methods which compensatethese errors by adding corrections for the balances to the signal in nextcoupling time step. Further past work combined smooth extrapolation ofexchanged data and balance correction. This gives rise to the problem thatestablishing balance of one quantity a posteriori due to the time delay ingeneral cannot establish or even disturbs the balances of quantities thatdepend on the exchanged quantities, usually energy. In this work, a method issuggested which allows to choose the quantity that should be balanced to bethat energy, and to accurately balance it.

On meeting Energy Balance Errors in Cosimulations