A synthetic-eddy-method for generating inflow conditions for large-eddy simulations

Jarrin, N; Benhamadouche, Sofiane; Laurence, Dominique; Prosser, Robert

doi:10.1016/j.ijheatfluidflow.2006.02.006

Cited by 633 publications

(336 citation statements)

References 11 publications

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“…The generated data do not exhibit any spatial or temporal correlations, and the pseudo turbulence is quickly dissipated. An effective method to generate synthetic eddies on the inlet plane is under implementation (Jarrin et al, 2006).…”

Section: Resultsmentioning

confidence: 99%

Numerical simulation of a weak breaking tidal bore

Lubin

Glockner

Chanson

2010

Mechanics Research Communications

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A tidal bore is a natural and fragile phenomenon, which is of great importance for the ecology of an estuary. The bore development is closely linked with the tidal range and the river mouth shape, and its existence is sensitive to any small change in boundary conditions. Despite their ecological and cultural value, little is known on the flow field, turbulent mixing and sediment motion beneath tidal bores. Indeed, some striking features can be highlighted in two-dimensional simulations, such as large velocity fluctuations and flow recirculation structures. Using Large Eddy Simulation method, we present numerical results that show the complicated turbulent structures and their unsteadiness under a tidal bore.

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Section: Resultsmentioning

confidence: 99%

Numerical simulation of a weak breaking tidal bore

Lubin

Glockner

Chanson

2010

Mechanics Research Communications

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“…The model is based upon the fluid dynamics code Fluidity (Piggott et al, 2008), which solves the Navier-Stokes equations on a fully unstructured three-dimensional finite element mesh. The model formulation builds upon the work of Kimura et al (2013), with the addition of a large eddy simulation (LES) turbulence model (Smagorinsky, 1963) and the use of the synthetic eddy method (SEM) at the inlet (Jarrin et al, 2006). The geometry of the model is adapted to Kronebreen by setting the water depth to 100 m and initialising the model with ambient temperature and salinity profiles collected from ringed seals instrumented with GPS-equipped conductivity, temperature and depth satellite relay data loggers (GPS-CTD-SRDLs) (Boehme et al, 2009;Everett et al, 2017).…”

Section: Plume Model and Submarine Melt Ratesmentioning

confidence: 99%

Effects of undercutting and sliding on calving: a global approach applied to Kronebreen, Svalbard

et al. 2018

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Abstract. In this paper, we study the effects of basal friction, sub-aqueous undercutting and glacier geometry on the calving process by combining six different models in an offlinecoupled workflow: a continuum-mechanical ice flow model (Elmer/Ice), a climatic mass balance model, a simple subglacial hydrology model, a plume model, an undercutting model and a discrete particle model to investigate fracture dynamics (Helsinki Discrete Element Model, HiDEM). We demonstrate the feasibility of reproducing the observed calving retreat at the front of Kronebreen, a tidewater glacier in Svalbard, during a melt season by using the output from the first five models as input to HiDEM. Basal sliding and glacier motion are addressed using Elmer/Ice, while calving is modelled by HiDEM. A hydrology model calculates subglacial drainage paths and indicates two main outlets with different discharges. Depending on the discharge, the plume model computes frontal melt rates, which are iteratively projected to the actual front of the glacier at subglacial discharge locations. This produces undercutting of different sizes, as melt is concentrated close to the surface for high discharge and is more diffuse for low discharge. By testing different configurations, we show that undercutting plays a key role in glacier retreat and is necessary to reproduce observed retreat in the vicinity of the discharge locations during the melting season. Calving rates are also influenced by basal friction, through its effects on near-terminus strain rates and ice velocity.

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“…with typically fifteen points in the viscous sublayer. Based on the view that turbulence comprises a superposition of coherent structures or turbulent spots, Jarrin et al(2006) proposed a synthetic eddy-method for inflow data. This method was very efficient.…”

Section: Introductionmentioning

confidence: 99%

Efficient Generation of Inflow Conditions for Large Eddy Simulation of Street-Scale Flows

Xie

Castro

2008

Flow Turbulence Combust

334

218

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Abstract. Using a numerical weather forecasting code to provide the dynamic large-scale inlet boundary conditions for the computation of small-scale urban canopy flows requires a continuous specification of appropriate inlet turbulence. For such computations to be practical, a very efficient method of generating such turbulence is needed.Correlation functions of typical turbulent shear flows have forms not too dissimilar to decaying exponentials. A digital-filter-based generation of turbulent inflow conditions exploiting this fact is presented as a suitable technique for LES computation of spatially developing flows. The artificially generated turbulent inflows satisfy the prescribed integral length scales and Reynolds-stress-tensor. The method is much more efficient than, for example, Klein's or Kempf et al.'s (2005) methods because at every time step only one set of two-dimensional (rather than three-dimensional) random data is filtered to generate a set of two-dimensional data with the appropriate spatial correlations. These data are correlated with the data from the previous time step by using an exponential function based on two weight factors. The method is validated by simulating plane channel flows with smooth walls and flows over arrays of staggered cubes (a generic urban-type flow). Mean velocities, the Reynolds-stress-tensor and spectra are all shown to be comparable with those obtained using classical inlet-outlet periodic boundary conditions. Confidence has been gained in using this method to couple weather scale flows and street scale computations.

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A synthetic-eddy-method for generating inflow conditions for large-eddy simulations

Cited by 633 publications

References 11 publications

Numerical simulation of a weak breaking tidal bore

Numerical simulation of a weak breaking tidal bore

Effects of undercutting and sliding on calving: a global approach applied to Kronebreen, Svalbard

Efficient Generation of Inflow Conditions for Large Eddy Simulation of Street-Scale Flows

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