Anisotropic adjoint sensitivity-based mesh movement for industrial applications

Vivarelli, Guglielmo; Qin, Ning; Shahpar, Shahrokh; Radford, David

doi:10.1016/j.compfluid.2021.104929

Cited by 1 publication

(1 citation statement)

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“…Concerning the different configurations of interest for aero-engine manufacturers, there are two main types of flows: internal flows (most notably turbomachinery flows) and hybrid flows that include external aerodynamics in order to study the engine installation effects on its operation. For the former configurations, the limited literature focuses either on mesh adaptation for structured meshes (for example in (Vivarelli et al, 2021)) or isotropic adaptation for multi-element meshes (Wyman et al, 2020). For hybrid external/internal flows, publications focus on unstructured meshes with either limited anisotropy (Ordaz et al, 2017) or with immersed boundaries and octree mesh refinement (Nemec et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Isotropic and anisotropic mesh adaptation for RANS simulations of a nacelle under crosswind conditions

Laure,

Dimitrios,

Frédéric

2023

J. Glob. Power Propuls. Soc.

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Mesh adaptation of unstructured meshes for aerodynamic simulations, that typically resolve the Reynolds Averaged Navier-Stokes (RANS) equations, is a promising approach to enable high numerical precision on complex geometries. Its objective is to minimize the discretization error without using empirical meshing guidelines. The most common approach of mesh adaptation is the “feature-based” isotropic mesh adaptation: from an initial flow prediction on an isotropic unstructured mesh, a local error estimator is computed using a flow variable. It is then used to adapt the mesh using isotropic tetrahedra. Additional near-wall resolution can be achieved by extruding prism layers from the walls. A more efficient approach is to use anisotropic mesh adaptation purely with tetrahedra that are stretched to follow the flow's preferential directions. In this work, we demonstrate the abilities of feature-based isotropic and anisotropic mesh adaptation on a complex flow phenomenon of importance for jet engines: flow separation in a nacelle under crosswind conditions. Two different solvers, adapted for either isotropic or anisotropic meshes, are employed. Results are compared with standard unstructured simulations with user-imposed mesh refinements and highlight the ability of mesh adaptation to automatically capture all the relevant flow phenomena without any user input and at reduced mesh size.

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