Immersed Boundary Lattice Green Function methods for External Aerodynamics

Mengaldo, Gianmarco; Liska, Sebastian; Yu, Ke; Colonius, Tim; Jardin, Thierry

doi:10.2514/6.2017-3621

Cited by 3 publications

(6 citation statements)

References 24 publications

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“…Converged lift is achieved for resolution finer or equal to Dx ¼ 0:012C. Indeed, while approaches by Mengaldo et al 12 and Jardin and David 13 demonstrate mesh independency for cell sizes on the order of 0:015C, the present LBM approach requires space resolution on the order of 0:012C, which demonstrates the good accuracy of the immersed boundary method used in the LBM code. Present results show that the revolving wing produces high levels of lift (considering the Reynolds number at which it operates) immediately after the impulsive start.…”

Section: Single-bladed Rotor At Low-reynolds Numbermentioning

confidence: 51%

“…Indeed, while approaches by Mengaldo et al. 12 and Jardin and David 13 demonstrate mesh independency for cell sizes on the order of 0.015C, the present LBM approach requires space resolution on the order of 0.012C, which demonstrates the good accuracy of the immersed boundary method used in the LBM code.…”

Section: Single-bladed Rotor At Low-reynolds Numbermentioning

confidence: 57%

“…Comparison of lift coefficient between DNS–LBM and DNS results obtained by Mengaldo et al. 12 and Jardin and David. 13 …”

Section: Single-bladed Rotor At Low-reynolds Numbermentioning

confidence: 95%

“…Results are compared with those reported in Mengaldo et al. 12 (DNS with an immersed boundary Lattice Green Function Method 14,15 ) and Jardin and David 13 (DNS obtained with the commercial STAR-CCM+ software). It is shown that the results obtained from the present DNS–LBM approach match those obtained with other well-validated methods within reasonable accuracy (less than 3%).…”

Section: Single-bladed Rotor At Low-reynolds Numbermentioning

confidence: 97%

“…Results are compared with those reported in Mengaldo et al 12 (DNS with an immersed boundary Lattice Green Function Method 14,15 ) and Jardin and David 13 (DNS obtained with the commercial STAR-CCMþ software). It is shown that the results obtained 12 and Jardin and David. 13 LBM: lattice-Boltzmann method.…”

Section: Single-bladed Rotor At Low-reynolds Numbermentioning

confidence: 98%

See 4 more Smart Citations

Application of a lattice Boltzmann method to some challenges related to micro-air vehicles

Gourdain

Jardin

Serré

et al. 2018

International Journal of Micro Air Vehicles

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The demand for micro-air vehicles is increasing as well as their potential missions. Whether for discretion in military operations or noise pollution in civilian use, the improvement of aerodynamic and acoustic performance of micro-air vehicles propeller is a goal to achieve. Micro-and nano-air vehicles operate at Reynolds numbers ranging from 10 3 to 10 5. In these conditions, the aerodynamic performance of conventional fixed and rotary wings concepts drastically decreases due to the increased importance of flow viscous forces that tend to increase drag and promote flow separation, which leads to reduced efficiency and reduced maximum achievable lift. Reduced efficiency and lift result in low endurance and limited payloads. The numerical simulation is a potential solution to better understand such low Reynolds number flows and to increase the micro-air vehicles' performance. In this paper, it is proposed to review some challenges related to micro-air vehicles by using a Lattice-Boltzmann method. The method is first briefly presented, to point out its strengths and weaknesses. Lattice-Boltzmann method is then applied to three different applications: a DNS of a single blade rotor, a large eddy simulation of a rotor operating in-ground effect and a large eddy simulation of a rotor optimised for acoustic performance. A comparison with reference data (Reynolds Averaged Navier-Stokes, DNS or experimental data) is systematically done to assess the accuracy of lattice-Boltzmann method-based predictions. The analysis of results demonstrates that lattice-Boltzmann method has a good potential to predict the mean aerodynamic performance (torque and thrust) if the grid resolution is chosen adequately (which is not always possible due to limited computational resources). A study of the turbulent flow is conducted for each application in order to highlight some of the physical flow phenomena that take place in such rotors. Different designs are also investigated, showing that potential improvements are still possible in terms of aerodynamic and aero-acoustic performance of low-Reynolds rotors.

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Section: Single-bladed Rotor At Low-reynolds Numbermentioning

confidence: 51%

Section: Single-bladed Rotor At Low-reynolds Numbermentioning

confidence: 57%

“…Comparison of lift coefficient between DNS–LBM and DNS results obtained by Mengaldo et al. 12 and Jardin and David. 13 …”

Section: Single-bladed Rotor At Low-reynolds Numbermentioning

confidence: 95%

Section: Single-bladed Rotor At Low-reynolds Numbermentioning

confidence: 97%

Section: Single-bladed Rotor At Low-reynolds Numbermentioning

confidence: 98%

See 3 more Smart Citations

Application of a lattice Boltzmann method to some challenges related to micro-air vehicles

Gourdain

Jardin

Serré

et al. 2018

International Journal of Micro Air Vehicles

Self Cite

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Immersed Boundary Projection Methods

Dorschner

Colonius

2020

Computational Methods in Engineering &Amp; The Sciences

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Projection-based reduced order models for a cut finite element method in parametrized domains

Karatzas

Ballarin

Rozza

2020

Computers & Mathematics with Applications

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This work presents a reduced order modeling technique built on a high fidelity embedded mesh finite element method. Such methods, and in particular the CutFEM method, are attractive in the generation of projection-based reduced order models thanks to their capabilities to seamlessly handle large deformations of parametrized domains and in general to handle topological changes. The combination of embedded methods and reduced order models allows us to obtain fast evaluation of parametrized problems, avoiding remeshing as well as the reference domain formulation, often used in the reduced order modeling for boundary fitted finite element formulations. The resulting novel methodology is presented on linear elliptic and Stokes problems, together with several test cases to assess its capability. The role of a proper extension and transport of embedded solutions to a common background is analyzed in detail. Recent improvements go under the names of Ghost-Cell finite difference methods, Cut-Cell finite volume approach, Immersed Interface, Ghost Fluid, Volume Penalty methods, for which we refer to the review paper [1] and references within. In particular, for what concerns incompressible flows in arbitrary smooth domains, the Immersed Boundary Smooth Extension method has shown high-order convergence for the incompressible Navier-Stokes equations [4].More in detail, extended mesh finite element methods using cut elements are examined in [5,6] for stationary Stokes flow systems, as well as for Navier-Stokes. An analysis for high Reynolds numbers, independent of the local Reynolds, has been carried out in [7,8,9]. XFEM approaches in 2D and 3D Navier-Stokes are reported in [10]. Higher Reynolds number aerodynamics problems in unbounded domains, thin vortex ring and Lattice Green function Immersed Boundary methods are studied in [11,12]. Furthermore, embedded and immersed methods have been used in solving fluid structure

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Immersed Boundary Lattice Green Function methods for External Aerodynamics

Cited by 3 publications

References 24 publications

Application of a lattice Boltzmann method to some challenges related to micro-air vehicles

Application of a lattice Boltzmann method to some challenges related to micro-air vehicles

Immersed Boundary Projection Methods

Projection-based reduced order models for a cut finite element method in parametrized domains

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