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Direct Simulations of Primary Atomization in Moderate-Speed Diesel Fuel Injection

K. Mehravaran
2013 International Journal of Materials Mechanics and Manufacturing  
An adaptive volume of fluid (VOF) method based on octree meshing is used, providing savings of two orders of magnitude in computational cost.  ...  Our recent "Direct" simulations of liquid fuel atomization in high-pressure diesel engine injectors are presented.  ...  The adaptive refinement based on the octree mesh is quite cheap, and practical to perform in every time step.  ... 
doi:10.7763/ijmmm.2013.v1.44 fatcat:voptmdoicvarfjc32d6zkw2qgy

Parallel simulation of multiphase flows using octree adaptivity and the volume-of-fluid method

Gilou Agbaglah, Sébastien Delaux, Daniel Fuster, Jérôme Hoepffner, Christophe Josserand, Stéphane Popinet, Pascal Ray, Ruben Scardovelli, Stéphane Zaleski
2011 Comptes rendus. Mecanique  
software implementing finite volume solvers on an octree adaptive grid together with a piecewise linear volume of fluid interface tracking method.  ...  The impact of a droplet on a layer of the same liquid results in the formation of a thin air layer trapped between the droplet and the liquid layer that the adaptive refinement allows to capture.  ...  Note also that while the simulation is relatively large (about 5 million cells overall at t = 1.6) it is much smaller than a non-adaptive uniform Cartesian grid with a comparable maximum resolution.  ... 
doi:10.1016/j.crme.2010.12.006 fatcat:yanhqyazhjgrjig32fci4d36du

Numerical simulation of droplets, bubbles and waves: state of the art

Daniel Fuster, Gilou Agbaglah, Christophe Josserand, Stéphane Popinet, Stéphane Zaleski
2009 Fluid Dynamics Research  
This work present current advances in the numerical simulation of twophase flows using a VOF method, balanced-force surface tension and quad/octree adaptive mesh refinement.  ...  The simulations of the atomization of a liquid sheet, the capillary retraction of a liquid sheet and two-and three-dimensional wave breaking all for air/water systems, are used to show the potential of  ...  Even a method using adaptivity but with a constant interface resolution would require about 50 times more grid points.  ... 
doi:10.1088/0169-5983/41/6/065001 fatcat:tyulcjprajd4jbyutyxwu3oiym

A semi-Lagrangian contouring method for fluid simulation

Adam W. Bargteil, Tolga G. Goktekin, James F. O'brien, John A. Strain
2006 ACM Transactions on Graphics  
In this article, we present a semi-Lagrangian surface tracking method for use with fluid simulations.  ...  Our method maintains an explicit polygonal mesh that defines the surface, and an octree data structure that provides both a spatial index for the mesh and a means for efficiently approximating the signed  ...  Because our fluid simulator has a regular grid its resolution is notably coarser than the surface tracker, which uses an octree.  ... 
doi:10.1145/1122501.1122503 fatcat:6bge3p2do5bo5ora4oj6hldsba

Tetrahedral Embedded Boundary Methods for Accurate and Flexible Adaptive Fluids

Christopher Batty, Stefan Xenos, Ben Houston
2010 Computer graphics forum (Print)  
Second, meshes must align with potentially complex moving surfaces and boundaries, necessitating continuous remeshing.  ...  When simulating fluids, tetrahedral methods provide flexibility and ease of adaptivity that Cartesian grids find difficult to match.  ...  Advect the liquid surface, with a standard surface tracker. 2. Optional: Remesh to generate a new tetrahedral mesh enveloping the liquid domain ( §4).  ... 
doi:10.1111/j.1467-8659.2009.01639.x fatcat:pmpcf4l5eragjmsoeztia4gjcy

Derivative Particles for Simulating Detailed Movements of Fluids

Oh-young Song, Doyub Kim, Hyeong-Seok Ko
2007 IEEE Transactions on Visualization and Computer Graphics  
Hence, starting with the conventional grid-based simulator, when the details of fluid movements need to be simulated, we replace the advection part with a particle simulator.  ...  For the fluid regions where such details are not needed, the advection is simulated using an octree-based constrained interpolation profile (CIP) solver, which we develop in this work.  ...  In order to simulate liquids, a model for tracking the liquid surfaces is needed in addition to a stable Navier-Stokes solver.  ... 
doi:10.1109/tvcg.2007.1022 pmid:17495331 fatcat:ty5uwi463zefpi7dcaj3if5qlu

Adaptive Physically Based Models in Computer Graphics

P.-L. Manteaux, C. Wojtan, R. Narain, S. Redon, F. Faure, M.-P. Cani
2016 Computer graphics forum (Print)  
One of the major challenges in physically-based modeling is making simulations efficient. Adaptive models provide an essential solution to these efficiency goals.  ...  This survey reviews the adaptive solutions proposed so far in computer graphics.  ...  More recent work [FWD14] combines an adaptive hexahedral finite element method based on octrees with a multigrid Poisson solver to animate highly detailed liquids. Bargteil et al.  ... 
doi:10.1111/cgf.12941 fatcat:vxw2g7hsffawvo7245vi6amipy

Matching fluid simulation elements to surface geometry and topology

Tyson Brochu, Christopher Batty, Robert Bridson
2010 ACM Transactions on Graphics  
When combined with highresolution explicit surface tracking this allows us to simulate nearly arbitrarily thin features, while eliminating noise and other artifacts that arise when there is a resolution  ...  mismatch between the simulation and the surface-and allowing a precise inclusion of surface tension based directly on and at the same resolution as the surface mesh.  ...  Acknowledgements This work was supported in part by a grant from the Natural Sciences and Engineering Research Council of Canada.  ... 
doi:10.1145/1833351.1778784 fatcat:xnzumwxerzfxvf2btjxfkk3x24

Matching fluid simulation elements to surface geometry and topology

Tyson Brochu, Christopher Batty, Robert Bridson
2010 ACM SIGGRAPH 2010 papers on - SIGGRAPH '10  
When combined with highresolution explicit surface tracking this allows us to simulate nearly arbitrarily thin features, while eliminating noise and other artifacts that arise when there is a resolution  ...  mismatch between the simulation and the surface-and allowing a precise inclusion of surface tension based directly on and at the same resolution as the surface mesh.  ...  Acknowledgements This work was supported in part by a grant from the Natural Sciences and Engineering Research Council of Canada.  ... 
doi:10.1145/1833349.1778784 fatcat:2w32f4nkofhbdk25jx7bh7mvw4

Matching fluid simulation elements to surface geometry and topology

Tyson Brochu, Christopher Batty, Robert Bridson
2010 ACM Transactions on Graphics  
When combined with highresolution explicit surface tracking this allows us to simulate nearly arbitrarily thin features, while eliminating noise and other artifacts that arise when there is a resolution  ...  mismatch between the simulation and the surface-and allowing a precise inclusion of surface tension based directly on and at the same resolution as the surface mesh.  ...  Acknowledgements This work was supported in part by a grant from the Natural Sciences and Engineering Research Council of Canada.  ... 
doi:10.1145/1778765.1778784 fatcat:m4syph3kjbb4nndkrazwxrlram

Simulation of primary atomization with an octree adaptive mesh refinement and VOF method

Daniel Fuster, Anne Bagué, Thomas Boeck, Luis Le Moyne, Anthony Leboissetier, Stéphane Popinet, Pascal Ray, Ruben Scardovelli, Stéphane Zaleski
2009 International Journal of Multiphase Flow  
We present different simulations of primary atomization using an adaptive Volumeof-Fluid method based on octree meshes.  ...  The use of accurate numerical schemes for mesh adaptation, Volume-of-Fluid advection and balanced force surface tension calculation implemented in Gerris, the code used to perform the simulations included  ...  Simulations with characteristic scales spread over several orders of magnitude have been possible using octree adaptive mesh refinement techniques.  ... 
doi:10.1016/j.ijmultiphaseflow.2009.02.014 fatcat:coqxn5vovfdjzitw62ucugflmm

An accurate adaptive solver for surface-tension-driven interfacial flows

Stéphane Popinet
2009 Journal of Computational Physics  
A method combining an adaptive quad/octree spatial discretisation, geometrical Volume-Of-Fluid interface representation, balanced-force continuum-surface-force surface tension formulation and height-function  ...  The extension of these methods to the quad/octree discretisation allows adaptive variable resolution along the interface and is described in detail.  ...  Dai and Schmidt [17] used their 3d adaptive unstructured tetrahedral mesh solver to study the case of the instability of a liquid cylinder with a free surface (i.e. the fluid motion of the gas phase  ... 
doi:10.1016/j.jcp.2009.04.042 fatcat:un5xa7dmjjhtdexhn4vk34xowa

Highly adaptive liquid simulations on tetrahedral meshes

Ryoichi Ando, Nils Thürey, Chris Wojtan
2013 ACM Transactions on Graphics  
Abstract We introduce a new method for efficiently simulating liquid with extreme amounts of spatial adaptivity.  ...  We couple this discretization with a spatially adaptive Fluid-Implicit Particle (FLIP) method, enabling efficient, robust, minimally-dissipative simulations that can undergo sharp changes in spatial resolution  ...  We also wish to thank Reiji Tsuruno for providing us with computational resources, and Pascal Clausen as well as Ramprasad Sampath for constructive discussions.  ... 
doi:10.1145/2461912.2461982 fatcat:zt2wbj4d3bdzldwq25rawxk7lq

5. Adaptive Mesh Refinement [chapter]

2005 Computational Methods for Option Pricing  
We present different simulations of primary atomization using an adaptive Volumeof-Fluid method based on octree meshes.  ...  The use of accurate numerical schemes for mesh adaptation, Volume-of-Fluid advection and balanced force surface tension calculation implemented in Gerris, the code used to perform the simulations included  ...  Simulations with characteristic scales spread over several orders of magnitude have been possible using octree adaptive mesh refinement techniques.  ... 
doi:10.1137/1.9780898717495.ch5 fatcat:jnyyui7hwzbojbl7tmxrxjb4oa

Free surface flow modelling on dynamically refined hexahedral meshes

K. Nikitin, Yu. Vassilevski
2008 Russian Journal of Numerical Analysis and Mathematical Modelling  
The method uses adaptively refined hexahedral meshes built on an enhanced octree data structure. The projection scheme traces back to the 1960s [3, 21, 23] .  ...  An efficient method for modelling incompressible free surface flows is presented.  ...  Olshanskii and A. Danilov for fruitful discussions and technical help.  ... 
doi:10.1515/rjnamm.2008.027 fatcat:aiae5y3p6ncu3ht6qbaodimyoy
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