The Generation of Realistic 3D, Unsteady Inlet Conditions for LES

Bonnet, Jean-Paul; Coiffet, F.; Delville, J.; Druault, Philippe; Lamballais, Éric; Lardeau, Sylvain; Largeau, J.-F.; Perret, Laurent

doi:10.2514/6.2003-65

Cited by 12 publications

(7 citation statements)

References 14 publications

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“…In order to decrease the simulation cost and to have an effective inflow data and turbulent inflow condition, the method of superposing random fluctuations on a considered mean velocity profile is used [39]. In spite of its simplicity, the random fluctuation approach to simulate perturbations in the flow has been applied with different degrees of success [40,41]. The boundary layer at the atmosphere has been applied using a power-law velocity profile as shown in Equation (1):…”

Section: Geometrical Model and Boundary Conditionsmentioning

confidence: 99%

Numerical Investigation of the Effect of Sloped Terrain on Wind-Driven Surface Fire and Its Impact on Idealized Structures

Edalati-nejad

Ghodrat

Simeoni

2021

Fire

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In this study, a time-dependent investigation has been conducted to numerically analyze the impact of wind-driven surface fire on an obstacle located on sloped terrain downstream of the fire source. Inclined field with different upslope terrain angles of 0, 10, 20, and 30° at various wind-velocities have been simulated by FireFoam, which is a large eddy simulation (LES) solver of the OpenFOAM platform. The numerical data have been validated using the aerodynamic measurements of a full-scale building model in the absence of fire effects. The results underlined the physical phenomena contributing to the impact of varying wind flow and terrain slope near the fire bed on a built area. The findings indicated that under a constant heat release rate and upstream wind velocity, increasing the upslope terrain angle leads to an increase in the higher temperature areas on the ground near the building. It is also found that raising the inclined terrain slope angle from 0 to 30°, results in an increase in the integrated temperature on the surface of the building. Furthermore, by raising the terrain slope from 0 to 30°, the integrated temperature on the ground for the mentioned cases increases by 16%, 10%, and 13%, respectively.

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Section: Geometrical Model and Boundary Conditionsmentioning

confidence: 99%

Numerical Investigation of the Effect of Sloped Terrain on Wind-Driven Surface Fire and Its Impact on Idealized Structures

Edalati-nejad

Ghodrat

Simeoni

2021

Fire

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“…One simple and yet effective method to specify turbulent inflow conditions and to minimize the cost associated with generating the inflow data is to superpose random fluctuations on a desired mean velocity profile [43]. Despite its simplicity, the random fluctuation approach to introduce perturbations to the flow has been used with varying degrees of success [44,45].…”

Section: Model Descriptionmentioning

confidence: 99%

LES Simulation of Wind-Driven Wildfire Interaction with Idealized Structures in the Wildland-Urban Interface

2020

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This paper presents a numerical investigation of the impact of a wind-driven surface fire, comparable to a large wildfire, on an obstacle located downstream of the fire source. The numerical modelling was conducted using FireFOAM, a coupled fire-atmosphere model underpinned by a large eddy simulation (LES) solver, which is based on the Eddy Dissipation Concept (EDC) combustion model and implemented in the OpenFOAM platform (an open source CFD tool). The numerical data were validated using the aerodynamic measurements of a full-scale building model in the absence of fire effects. The results highlighted the physical phenomena contributing to the fire spread pattern and its thermal impact on the building. In addition, frequency analysis of the surface temperature fluctuations ahead of the fire front showed that the presence of a building influences the growth and formation of buoyant instabilities, which directly affect the behaviour of the fire’s plume. The coupled fire-atmosphere modelling presented here constitutes a fundamental step towards better understanding the behaviour and potential impacts of large wind-driven wildland fires in wildland-urban interface (WUI) areas.

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“…The reconstruction of dominant flow structures based on POD modes turned out to be sensitive enough to respond to changes in eddy structures. Numerical studies by Bonnet et al (2003) and Perret et al (2006) documented the applicability of LSE/POD for inflow generation in mixing layers. The results of this study indicate that these or similar approaches of combining both spatial methods might also be fruitful in the case of data from strongly complex atmospheric surface layer flows.…”

Section: Discussionmentioning

confidence: 98%