DNS of buoyancy-dominated turbulent flows on a bluff body using the immersed boundary method

Kang, Seongwon; Iaccarino, Gianluca; Ham, Frank

doi:10.1016/j.jcp.2008.12.037

Cited by 60 publications

(32 citation statements)

References 37 publications

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“…Problems in which the Reynolds number is low or moderate (the flow in the low-pressure turbine of a turbofan engine) may be better Locally refined mesh for the DNS of the heat transfer in a cylinder above a flat plate. Reproduced with permission from [25].…”

Section: (A) Computational Costmentioning

confidence: 99%

Large eddy simulations in 2030 and beyond

Piomelli

2014

Phil. Trans. R. Soc. A.

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Since its introduction, in the early 1970s, large eddy simulations (LES) have advanced considerably, and their application is transitioning from the academic environment to industry. Several landmark developments can be identified over the past 40 years, such as the wall-resolved simulations of wall-bounded flows, the development of advanced models for the unresolved scales that adapt to the local flow conditions and the hybridization of LES with the solution of the Reynolds-averaged Navier–Stokes equations. Thanks to these advancements, LES is now in widespread use in the academic community and is an option available in most commercial flow-solvers. This paper will try to predict what algorithmic and modelling advancements are needed to make it even more robust and inexpensive, and which areas show the most promise.

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Section: (A) Computational Costmentioning

confidence: 99%

Large eddy simulations in 2030 and beyond

Piomelli

2014

Phil. Trans. R. Soc. A.

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“…In a preliminary step, the geometry under consideration, which is described by a closed polygon in two dimensions (a closed surface in three dimensions), is overlapped onto a Cartesian grid. Using the ray tracing technique based on the geometrical algorithms reported in [47] In order to resolve strong gradients the computational mesh can be locally refined by an automated algorithm up to a user-specified resolution [48]. Note that the mesh refinement does not need to be isotropic.…”

Section: Immersed-boundary Navier-stokes (Ibns) Equation Solvermentioning

confidence: 99%

Particle Methods for Nonequilibrium Hypersonic and Plasma Flows

Bruno¹,

Panarese²,

Diomede³

et al. 2014

TOPPJ

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Kinetic modelling of nonequilibrium flows is described as it applies to hypersonic phenomenology. A Monte Carlo method is described for the study of species separation on shock wave fronts; a Particle in Cell with Monte Carlo Collisions (PIC/MCC) technique is described for the simulation of dust in plasma flows; modelling of nonequilibrium radiation in shock heated gases; implementation of slip models for the description of separation zones occurring in shockboudary layer interactions.

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“…The main advantage of using the IB consists in solving flows bounded by arbitrarily complex geometries without resorting to body-conformal grids for which the motion is prescribed, and, therefore, the solution technique essentially has the same ease of use and efficiency as that of simple geometries. The method is second-order in space and this technique has already been implemented in many different scenarios and grid layouts, e.g., laminar and turbulent convection, 27-29 turbulent flows and particle collision, [30][31][32][33] biological devices, 34 and bifurcations. 35 The threedimensional simulations were conducted using the immersed boundary method of Ref.…”

Section: Numerical Scheme and The Experimental Setupmentioning

confidence: 99%

Fluid velocity fluctuations in a collision of a sphere with a wall

et al. 2011

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A study of thermal counterflow using particle tracking velocimetry Phys. Fluids 23, 107102 (2011) Particle accumulation on periodic orbits by repeated free surface collisions Phys. Fluids 23, 072106 (2011) We report on the results of a combined experimental and numerical study on the fluid motion generated by the controlled approach and arrest of a solid sphere moving towards a solid wall at moderate Reynolds number. The experiments are performed in a small tank filled with water for a range of Reynolds numbers for which the flow remains axisymmetric. The fluid agitation of the fluid related to the kinetic energy is obtained as function of time in the experiment in a volume located around the impact point. The same quantities are obtained from the numerical simulations for the same volume of integration as in the experiments and also for the entire volume of the container. As shown in previous studies, this flow is characterized by a vortex ring, initially in the wake of the sphere, that spreads radially along the wall, generating secondary vorticity of opposite sign at the sphere surface and wall. It is also observed that before the impact, the kinetic energy increases sharply for a small period of time and then decreases gradually as the fluid motion dies out. The measure of the relative agitation of the collision is found to increase weakly with the Reynolds number Re. The close agreement between the numerics and experiments is indicative of the robustness of the results. These results may be useful in light of a potential modelling of particle-laden flows. Movies illustrating the spatio-temporal dynamics are provided with the online version of this paper.

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DNS of buoyancy-dominated turbulent flows on a bluff body using the immersed boundary method

Cited by 60 publications

References 37 publications

Large eddy simulations in 2030 and beyond

Large eddy simulations in 2030 and beyond

Particle Methods for Nonequilibrium Hypersonic and Plasma Flows

Fluid velocity fluctuations in a collision of a sphere with a wall

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