Hybrid grid generation for two-dimensional high-Reynolds flows

Dussin, D.; Fossati, Marco; Guardone, Alberto; Vigevano, Luigi

doi:10.1016/j.compfluid.2009.04.007

Cited by 35 publications

(14 citation statements)

References 17 publications

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“…Therefore, it is not only necessary to capture these detailed flow features, but also to verify that the flow field solution is independent of the constructed grids. An incorrect evaluation of the flow field solution can be incurred if the local size of the grids is not considered in greater extent and variations in the smaller portion of the domain, the sampler inlet grid, can affect the whole flow field solution (Dussin, Fossati, Guardone & Vigevano, 2009). The aforementioned drawbacks are particularly encountered when manual scaling of grids is used, since several attempts may be needed to generate a grid that can reach a converged solution from which subsequent scaling will be performed and that can achieve the least computational effort.…”

Section: Methods and Modelsmentioning

confidence: 99%

Three-dimensional computational fluid dynamics modeling of particle uptake by an occupational air sampler using manually-scaled and adaptive grids

Landázuri

Sáez

Anthony

2016

Journal of Aerosol Science

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This work presents fluid flow and particle trajectory simulation studies to determine the aspiration efficiency of a horizontally oriented occupational air sampler using computational fluid dynamics (CFD). Grid adaption and manual scaling of the grids were applied to two sampler prototypes based on a 37-mm cassette. The standard k–ε model was used to simulate the turbulent air flow and a second order streamline-upwind discretization scheme was used to stabilize convective terms of the Navier–Stokes equations. Successively scaled grids for each configuration were created manually and by means of grid adaption using the velocity gradient in the main flow direction. Solutions were verified to assess iterative convergence, grid independence and monotonic convergence. Particle aspiration efficiencies determined for both prototype samplers were undistinguishable, indicating that the porous filter does not play a noticeable role in particle aspiration. Results conclude that grid adaption is a powerful tool that allows to refine specific regions that require lots of detail and therefore better resolve flow detail. It was verified that adaptive grids provided a higher number of locations with monotonic convergence than the manual grids and required the least computational effort.

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Section: Methods and Modelsmentioning

confidence: 99%

Three-dimensional computational fluid dynamics modeling of particle uptake by an occupational air sampler using manually-scaled and adaptive grids

Landázuri

Sáez

Anthony

2016

Journal of Aerosol Science

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“…Also, the number of design variables times 100 is taken for the number of blackbox evaluations needed for each optimization problem. A hybrid grid (Dussin et al 2009) is used around the NACA 0012 airfoil and a structured one inside the leading edge's composite shell (Fig. 10).…”

Section: Numerical Test Casesmentioning

confidence: 99%

Constrained problem formulations for power optimization of aircraft electro-thermal anti-icing systems

et al. 2015

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Various constrained problem formulations for the optimization of an electro-thermal wing anti-icing system in both running-wet and evaporative regimes are presented. The numerical simulation of the system is performed by solving the conjugate heat transfer problem between the fluid and solid domains. The optimization goal is to reduce the energy use and power demand of the anti-icing system while ensuring a safe protection. The formulations are carefully proposed from the physical and mathematical viewpoints; their performance is assessed by means of several numerical test cases to discern the most promising for each regime. The design optimization is conducted using the mesh adaptive direct search algorithm using quadratic and statistical surrogate models in the search step. The influence of the models on the convergence speed and the quality of the obtained design solutions is investigated.

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“…The results have been compared with wind tunnel experimental data . The initial grid has been generated by means of a hybrid grid generation technique proposed by the authors . The grid is made of 19,370 nodes and 24,579 elements and comprises a structured layer for the boundary layer around the main airfoil element and around the flap, together with three structured regions located approximately in correspondence of the wakes at the trailing edge of both the main element and the flap and in correspondence of the lower corner of the flap cove.…”

Section: Numerical Experimentsmentioning

confidence: 99%

A node‐pair finite element/volume mesh adaptation technique for compressible flows based on a hierarchical approach

Fossati

Guardone

Vigevano

2012

Numerical Methods in Fluids

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SUMMARY A grid adaptation technique for two‐dimensional unstructured grids of triangles and quadrilaterals is presented. The error estimation procedure is formulated in terms of a node pair‐based data structure that allows for a unified description of the finite element and finite volume schemes. The adaptation algorithm is based on a strategy of hierarchical corrections, where a suitable number of intermediate adapted grids are generated and successively corrected by employing a simple node insertion technique at the midpoint of the element edges. Coarsening of the grid is obtained in an implicit fashion by avoiding the insertion of new nodes during the correction phase. The adaptation history, from the initial to the current grid, including all intermediate grids, is stored and updated through the whole process. No intermediate grid is therefore required to be stored explicitly. The adapted grid is anisotropic, thanks to the adoption of both regular triangular and quadrilateral elements with high aspect ratio that are gathered in, for example, boundary layer or wake regions. Numerical experiments of steady compressible flows, including both inviscid and viscous flows, are presented to support the suitability of the adaptation technique. Copyright © 2012 John Wiley & Sons, Ltd.

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Hybrid grid generation for two-dimensional high-Reynolds flows

Cited by 35 publications

References 17 publications

Three-dimensional computational fluid dynamics modeling of particle uptake by an occupational air sampler using manually-scaled and adaptive grids

Three-dimensional computational fluid dynamics modeling of particle uptake by an occupational air sampler using manually-scaled and adaptive grids

Constrained problem formulations for power optimization of aircraft electro-thermal anti-icing systems

A node‐pair finite element/volume mesh adaptation technique for compressible flows based on a hierarchical approach

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