|Publisher DOI:||10.1016/j.cej.2019.01.161||Title:||Dynamics and long-time behavior of gas–solid flows on recurrent-transient backgrounds||Language:||English||Authors:||Lichtenegger, T.
|Issue Date:||15-May-2019||Source:||Chemical Engineering Journal (364): 562-577 (2019-05-15)||Journal or Series Name:||Chemical engineering journal||Abstract (english):||© 2019 Elsevier B.V. Gas–solid fluidized beds exhibit characteristic, reappearing patterns. External parameter variations or coupling between internal processes superpose a transient behavior on top of these recurrences. We demonstrate how recurrence CFD (rCFD) can cope with such scenarios by interpolating between multiple, pre-generated databases corresponding to short (2.5 s) time series in different flow regimes. The methodology is applied to a fluidized bed of approximately 80 000 solid particles subject to internal heat production and fluidization with cool gas for a duration of 800 s. The fluid's thermal expansion due to heat transfer ([290 K; 430 K]) and the varying inlet velocities ([0.4 m/s; 0.9 m/s]) cause the desired transiency. We find excellent agreement for particle mean temperatures over time and qualitative similarity for their standard deviation between detailed, established simulation techniques and rCFD with speed-ups of more than two orders of magnitude. Furthermore, we present implementation advancements concerning parallel data exchange and compare all-to-all with one-to-one communication schemes. Analysis of the code's performance points the way for future optimization measures.||URI:||http://hdl.handle.net/11420/2150||ISSN:||1385-8947||Institute:||Feststoffverfahrenstechnik und Partikeltechnologie V-3||Type:||(wissenschaftlicher) Artikel|
|Appears in Collections:||Publications without fulltext|
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