A framework for the generation of high-order curvilienar hybrid meshes for CFD simulations
Procedia Engineering, vol. 203, pp. 206-218 (2017)
@inproceedings{turner-2017b,
title = {A framework for the generation of high-order curvilienar hybrid meshes for CFD simulations},
author = {Turner, M. and Moxey, D. and Peir\'o, J. and Gammon, M. and Pollard, C. R. and Bucklow, H.},
booktitle = {Procedia Engineering},
year = {2017},
volume = {203},
pages = {206-218},
doi = {10.1016/j.proeng.2017.09.808},
url = {http://www.sciencedirect.com/science/article/pii/S1877705817343692},
abstract = {We present a pipeline of state-of-the-art techniques for the generation of high-order meshes that contain highly stretched elements in viscous boundary layers, and are suitable for flow simulations at high Reynolds numbers. The pipeline uses CADfix to generate a medial object based decomposition of the domain, which wraps the wall boundaries with prismatic partitions. The use of medial object allows the prism height to be larger than is generally possible with advancing layer techniques. CADfix subsequently generates a hybrid straight-sided (or linear) mesh. A high-order mesh is then generated a posteriori using NekMesh, a high-order mesh generator within the Nektar++ framework. During the high-order mesh generation process, the CAD definition of the domain is interrogated; we describe the process for integrating the CADfix API as an alternative backend geometry engine for NekMesh, and discuss some of the implementation issues encountered. Finally, we illustrate the methodology using three geometries of increasing complexity: a wing tip, a simplified landing gear and an aircraft in cruise configuration.}
}
A pipeline for generating high-order meshes carrying the highly stretched boundary-layer elements that high Reynolds number simulation needs. CADfix produces a medial-object decomposition and a straight-sided hybrid mesh, and NekMesh then curves it, interrogating the CAD definition through the CADfix API. It is illustrated on three geometries of increasing difficulty: a wing tip, a simplified landing gear and an aircraft in cruise configuration.
Abstract
We present a pipeline of state-of-the-art techniques for the generation of high-order meshes that contain highly stretched elements in viscous boundary layers, and are suitable for flow simulations at high Reynolds numbers. The pipeline uses CADfix to generate a medial object based decomposition of the domain, which wraps the wall boundaries with prismatic partitions. The use of medial object allows the prism height to be larger than is generally possible with advancing layer techniques. CADfix subsequently generates a hybrid straight-sided (or linear) mesh. A high-order mesh is then generated a posteriori using NekMesh, a high-order mesh generator within the Nektar++ framework. During the high-order mesh generation process, the CAD definition of the domain is interrogated; we describe the process for integrating the CADfix API as an alternative backend geometry engine for NekMesh, and discuss some of the implementation issues encountered. Finally, we illustrate the methodology using three geometries of increasing complexity: a wing tip, a simplified landing gear and an aircraft in cruise configuration.