Ruben Moreno-Ramos, Fernando Varas, Jose M. Vega

DOI Number: N/A

Conference number: IFASD-2019-024

A self adaptive POD based ROM capable of speeding up computational aeroelastic simulations, the so called ”POD on the Fly”, was presented during IFASD 2017 in Como, Italy. The previously presented method couples together a 3 d.o.f. airfoil structural model with a CFD solver (Euler or RANS equations) and during the simulation a POD based ROM is created, where the governing equations are proyected only on a subset of selected points from the computational domain, acting the remaining as slaves. Once the ROM is deemed to be accurate enough, it takes over the simulation until the ROM accuracy is degraded (mainly due to truncation instabilities), moment at which the simulation is continued by the CFD, updating the ROM and repeating the process. In the previously presented simulations, significant speed up was achieved for subsonic simulations, to the point that the solution would not have to revert back to the CFD solver after a given point. This paper extends the ROM capabilities to 3D simulations, solving issues like the non-trivial selection of master cells and the computational issues of ROMs created over multiple computer nodes, as it is typical of industrial 3D CFD simulations.

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In Categories: IFASD 2019, Reduced Order Models
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