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A robust methodology for RANS simulations of highly underexpanded jets
Author(s) -
Lehnasch G.,
Bruel P.
Publication year - 2007
Publication title -
international journal for numerical methods in fluids
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 112
eISSN - 1097-0363
pISSN - 0271-2091
DOI - 10.1002/fld.1613
Subject(s) - reynolds averaged navier–stokes equations , polygon mesh , jet (fluid) , upwind scheme , turbulence , computer science , computational fluid dynamics , finite volume method , mathematics , rotational symmetry , compressibility , compressible flow , finite element method , mechanics , mesh generation , transonic , shock (circulatory) , aerospace engineering , physics , aerodynamics , engineering , mathematical analysis , discretization , computer graphics (images) , thermodynamics , medicine
This work aims at developing/combining numerical tools adapted to the simulation of the near field of highly underexpanded jets. An overview of the challenging numerical problems related to the complex shock/expansion structure encountered in these flows is given and an efficient and low‐cost numerical strategy is proposed to overcome these, even on short computational domains. Based on common upwinding algorithms used on unstructured meshes in a mixed finite‐volume/finite‐element approach, it relies on an appropriate utilization of zonal anisotropic remeshing algorithms. This methodology is validated for the whole near field of cold air jets issuing from axisymmetric convergent nozzles and yielding various underexpansion ratios. In addition, the most usual corrections of the k –ε model used to take into account the compressibility effects on turbulence are precisely assessed. Copyright © 2007 John Wiley & Sons, Ltd.