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A hybrid reduced order method for modelling turbulent heat transfer problems

TitleA hybrid reduced order method for modelling turbulent heat transfer problems
Publication TypeJournal Article
Year of Publication2020
AuthorsGeorgaka, S, Stabile, G, Star, K, Rozza, G, Bluck, MJ
JournalComputers & Fluids
Volume208
Pagination104615
Abstract

A parametric, hybrid reduced order model approach based on the Proper Orthogonal Decomposition with both Galerkin projection and interpolation based on Radial Basis Functions method is presented. This method is tested against a case of turbulent non-isothermal mixing in a T-junction pipe, a common ow arrangement found in nuclear reactor cooling systems. The reduced order model is derived from the 3D unsteady, incompressible Navier-Stokes equations weakly coupled with the energy equation. For high Reynolds numbers, the eddy viscosity and eddy diffusivity are incorporated into the reduced order model with a Proper Orthogonal Decomposition (nested and standard) with Interpolation (PODI), where the interpolation is performed using Radial Basis Functions. The reduced order solver, obtained using a k-ω SST URANS full order model, is tested against the full order solver in a 3D T-junction pipe with parametric velocity inlet boundary conditions.

URLhttps://arxiv.org/abs/1906.08725
DOI10.1016/j.compfluid.2020.104615

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