Chain-ROM: Efficient Simulator for Coupled Turbulent Flow
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Large systems are common in industrial applications and remain a computational challenge. It is known that high-fidelity methods, despite their extended capabilities, are not fit for tackling such large and/or parametrised systems in a time-efficient manner. Various alternatives have been proposed that aim to efficiently approximate complex problems for a small penalty in accuracy. Still, constructing parametrised surrogates of larger systems is far from trivial. Valid examples would be fluid-fluid coupled flow problems, e.g., wind-farms, which are characterised by their size and complexity. This work showcases the Chain-ROM strategy, i.e., the coupling of ROMs for turbulent flow problems. The core components are versatile hybrid ROMs [1] that replace their high fidelity counterparts in a larger system. In this case the system consists of a repetition of two ROMs. A versatile ROM fluid simulator combining data-driven and projection-based techniques, as well as corrective terms, and the ROM interface which handles communication between the ROM components. Special care is required during the sampling procedure, and the complexity reduction of the unsteady ROM components interface. Finally, the capabilities of the proposed strategy are tested by constructing a ROM component and emulating the turbulent flow over a series of simplified geometries and parametrised inflow conditions.
