a1679efa80
The integration of force and heat transfer onto the particle is facilitated by a run-time-selectable integration scheme. These schemes were written to generate the value at the end of an intregration step and also an average value over the step from which the total transfer was computed. The average value in the Euler scheme was implemented incorrectly, which resulted in the momentum and heat transfer processes being non-conservative. Implementing the average correctly, however, would have inteoduced a number of trancendental functions which would have negated the purpose of the Euler scheme as the cheap and stable option. The schemes have been rewritten to generate changes over the step, rather than the final value. This change is then used to calculate the transfers. Regardless of the scheme, this formulation is guaranteed to be conservative, and the Euler scheme remains computationally inexpensive. This change was made with help from Timo Niemi, VTT This resolves bug report https://bugs.openfoam.org/view.php?id=2666 ENH: integrationSchemes: Further simplification and optimisation Removed templating from integration schemes, improved the name convention, and optimised the utilisation so that the virtual call is only made once per integration in the KinematicParcel and the ThermoParcel. BUG: integrationSchemes: Corrections to coupled/non-coupled force splitting The integration splitting implemented in commit a5806207 has been shown to be incorrect in some cases. A new procedure has been implemented which can correctly split the implicit-explicit integral into a number of pieces, in order to calculate the contribution of each. This is intended for integrating coupled and non-coupled particle momentum and heat transfers. However, currently there is only ever one implicit coefficient used in these transfers (there is no implicit non-coupled contribution). The evaluation has therefore been short-cutted to only do the integration with respect to the coupled contributions. The splitting functionality has been retained in case additional separate implicit coefficients are required in the future. This change was made with help from Timo Niemi, VTT This resolves bug report https://bugs.openfoam.org/view.php?id=2666
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