A finite element method study of Eulerian droplets impingement models

A three-dimensional Eulerian analysis has been developed for modeling droplet impingement on lifting bodes. The Eulerian model solves the conservation equations of mass and momentum to obtain the droplet flow field properties on the same mesh used in CFD simulations. For complex configurations such as a full rotorcraft, the Eulerian approach is more efficient because the Lagrangian approach would require a significant amount of seeding for accurate estimates of collection efficiency. Simulations are done for various benchmark cases such as NACA0012 airfoil, MS317 airfoil and oscillating SC2110 airfoil to illustrate its use. The present results are compared with results from the Lagrangian approach used in an industry standard analysis called LEWICE.

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“…In the derivation of governing equations for air-droplet flows, the following assumptions are made 18 :…”

Section: B Droplet Solvermentioning

confidence: 99%

Ice Accretion Modeling Using an Eulerian Approach for Droplet Impingement

Kim

Garza

Sankar

et al. 2013

51st AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

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“…In order to validate the new scheme, experimental test cases are selected from the literature (Morency et al 1999;Silveira et al 2003;Vu et al 2002). From the literature survey, the local collection efficiency is defined as the normalized influx of droplets at a given location, (Bourgault et al 1999), where the velocity …”

Section: Verification and Validationmentioning

confidence: 99%

A Computational Modeling for Semi-Coupled Multiphase Flow in Atmospheric Icing Conditions

Jung

2015

J.Aerosp. Technol. Manag.

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A two-dimensional second-order positivitypreserving finite volume upwind scheme is developed for a semi-coupled algorithm involving the air and droplet flow fields in the Eulerian frame, which shares the grid for each phase. Special emphasis is placed on the computational modeling, which is induced from a strongly-coupled algorithm that satisfies the strict hyperbolicity and its numerical scheme based on the Harten-Lax-van Leer-Contact solver preserving the positivity to handle multiphase flow in the Eulerian frame. The proposed modeling associated with the semi-coupled algorithm including the Navier-Stokes and droplet equations takes into account different boundary conditions on the solid surface for each phase. The verification and validation studies show that the new scheme can solve the air and droplet flow fields in fairly good agreement with the exact analytical solutions and experimental data. In particular, it accurately predicted the maximum value of the droplet impingement intensity near the stagnation region and the droplet impingement area.

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“…The DROP3D module solves for water concentration and droplet velocities via an Eulerian formulation to automatically determine the mass of water collected on exposed surfaces [2]. The discretized equations are solved using a canonical Galerkin Finite Element discretization.…”

Section: Fig 1 Flow Chart For Unsteady Conjugate Heat Transfermentioning

confidence: 99%

“…It was developed during last decade. First, in 1999, an Eulerian model for air flows containing water droplets was proposed as an alternative to the traditional Lagrangian particle tracking approach to compute droplet impingement on airfoils [2]. The model was implemented in a 3D droplets Eulerian code, DROP3D, used for computing the water caught on 3D aircraft components and engines.…”

Section: Introductionmentioning

confidence: 99%