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Topic: Smoothed particle hydrodynamics

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	Smoothed particle hydrodynamics - Wikipedia, the free encyclopedia
		These particles have a spatial distance (known as the "smoothing length", typically represented in equations by h), over which their properties are "smoothed" by a kernel function.
		For example, the temperature of particle i depends on the temperatures of all the particles within a radial distance 2h of particle i.
		The Lagrangian-based adaptivity of SPH is analogous to the adaptivity present in grid-based adaptive mesh refinement codes, though in the latter case one can refine the mesh spacing according to any criterion selected by the user.
	en.wikipedia.org /wiki/Smoothed_particle_hydrodynamics (730 words)

	Smoothed Particle Hydrodynamics (Site not responding. Last check: 2007-11-07)
		The particles are initially distributed with a specified density distribution, and are evolved according to the fluid conservation equations (Monaghan 1988; Hernquist & Katz 1989; Benz 1990).
		The values of continuous variables are determined by an interpolation or smoothing of the nearby particle distribution using a special weighting function known as the smoothing kernel which has a given length-scale: the smoothing length.
		The omission of this term in the inviscid hydrodynamics equations results in large unphysical oscillations in the field variables in the wake of a shock.
	cfa-www.harvard.edu /~jhouser/SPH.html (408 words)

	Physically-Based Fluid Modeling using Smoothed Particle Hydrodynamics
		Particle systems were introduced into computer graphics in 1983 by Reeves as a method of modeling "fuzzy" objects such as fire, smoke and grass (Reeves, 1983).
		The SPH method was introduced in 1977 by Lucy (Lucy, 1977) and Gingold and Monaghan (Gingold and Monaghan, 1977) as a new method of solving the equations of motion of a compressible fluid.
		The XSPH variant (Monaghan, 1994; 1989) is used to coax particles to move with a velocity similar to the average velocity in its neighborhood which is said to be useful for high speed flow.
	www.plunk.org /~trina/thesis/html/thesis_ch2.html (3609 words)

	Planetary Formation: Contents of Smoothed Particle Hydrodynamics (via CobWeb/3.1 planetlab2.netlab.uky.edu) (Site not responding. Last check: 2007-11-07)
		Smoothed particle hydrodynamics (SPH) is an N-body integration scheme that was introduced independently by Gingold and Monaghan (1977) and Lucy (1977) in order to model complicated non-symmetric phenomena in astrophysics.
		Thus all particles in a system contribute to the summation in Equation 2.2, even the ones that are at such a distance that their contribution is effectively zero.
		It is clear from Figure 2.2, that if the smoothing lengths are not reduced in size during the inflow of material, the potential for increasing the resolution in the central region is lost, due to the large smearing present.
	www.droxley.freeserve.co.uk.cob-web.org:8888 /node9_ct.html (7539 words)

	Hydrodynamics: Fluid Motion
		Turbulence is a form of fluid flow in which the molecules of the fluid move over a surface in irregular paths, resulting in the exchange of momentum from one portion of the fluid to another.
		Laminar means 'in layers', referring to fluid flow in which the molecules of a fluid move over a surface in discrete layers without fluctuations, so that successive particles passing the same point have the same velocity.
		For a flexible form, the optimal hydrodynamic shape also features reversal of planes, in which the plane of the flattened forward portion is at right angles to the plane of the flattened rearward portion.
	www.elasmo-research.org /education/white_shark/hydrodynamics.htm (855 words)

	SPH Resources
		Smooth particle hydrodynamics - SPH - is a flexible Lagrangian technique for computational fluid dynamics simulations.
		In SPH the continuous fluid is modelled as a collection of particles, which move under the influence of hydrodynamic and, frequently, gravitational forces.
		This is code for performing one dimensional gas dynamical simulations using the technique known as smooth particle hydrodynamics.
	www.epcc.ed.ac.uk /~mario/sph.html (444 words)

	Dr Ben Rogers - Research
		Smoothed Particle Hydrodynamics (SPH) describes a fluid by replacing its continuum properties with locally (smoothed) quantities at discrete Lagrangian locations, so it is a meshless method.
		The SPH method has been used by Monaghan and his co-workers to describe a variety of free surface flows including solitary wave propagation over a planar beach (Monaghan and Kos 1999), plunging breakers (Tulin and Landrini 2000), solid bodies impacting on the surface (Monaghan 2000) and dam break simulations (Monaghan 1994).
		The method predicts fluid pressure, velocities, energy and particle trajectories for many types of flows making it ideal for identifying/elucidating formation mechanisms of complicated flow phenomena that were hitherto intractable.
	www.ce.jhu.edu /brogers/research.html (352 words)

	Project (Site not responding. Last check: 2007-11-07)
		Smoothed Particle Hydrodynamics (SPH) is a meshless, Lagrangian particle method for the numerical solution of partial differential equations.
		Among the meshless is SPH one of the oldest methods (Lucy 1977, Monaghan 1982).
		Unlike conventional Lagrangian techniques, SPH avoids mesh tangling and is therefore much more robust in its treatment of problems with large material distortions.
	wwwwissrech.iam.uni-bonn.de /research/projects/caglar/sph/sph.html (231 words)

	SPH (Smoothed Particle Hydrodynamics) (Site not responding. Last check: 2007-11-07)
		SPH is a fully Lagrangian particle method which can be used to simulate non hydrostatic water flow.
		SPH is a robust method especially suited to model situations with difficult water levels.
		The particles in SPH carry all the flow quantities and move with their own velocity.
	www.svasek.nl /modelling/sph.htm (137 words)

	[No title]
		The details of how SPH particles interact with each other and how physical quantities such as stresses and forces are derived from these interactions is beyond the scope of this paper, but the interested reader is referred to [2] for a description of the SPH formulation within serial PRONTO-3D.
		A single SPH particle may interact with several nearby neighbors and with a distant particle whose radius is large.
		Thus an efficient parallel implementation of SPH has two requirements: (1) the number of SPH particles per processor must be balanced, and (2) the spatial region owned by a processor must be geometrically compact to enable neighbors to be found quickly and with a minimum of communication.
	www.cs.sandia.gov /~sjplimp/papers/HTML/sc96/sc96.html (7946 words)

	SPHERIC: SPH Special Interest Group (ERCOFTAC) Home Page
		Smoothed Particle Hydrodynamics (SPH) was developed to study non-axisymmetric phenomena in astrophysics.
		SPARTICLES, is the CSCS GPU/Sprite-based particle renderer for particle simulation data.
		Smoothed Particle Hydrodynamics Forum is intended to be a place for discussing SPH algorithms and techniques, existing tools, case applications and for the exchange of experience.
	cfd.me.umist.ac.uk /sph (591 words)

	LTNT > Research - Projects - Remeshed Smoothed Particle Hydrodynamics for the Simulation of Compressible, Viscous, ... (Site not responding. Last check: 2007-11-07)
		SPH is enhanced for handling accurately diffusion type processes.
		A novel feature of the SPH approach is the periodic re-initialization (remeshing) of the particles, which are distorted by the flow map.
		The robustness and accuracy of the proposed Remeshed SPH (RSPH) methodology is tested for a number of benchmark problems involving flow and energy transport.
	www.ltnt.ethz.ch.cob-web.org:8888 /researchprojects.php?id=61 (214 words)

	Cataclysmic Variables
		Most importantly, you now can see the particles color-coded by their 'luminosity' over the previous time step, where we're assuming that the viscous dissipation energy is proportional to the luminosity.
		The 'white' particles are the bright ones, and really demonstrate the location of the superhump light source.
		Notice in particular that the spiral arms are not fixed, but advance ~180 degrees every orbit (actually every superhump period), so that the arms alternate in their interaction with the rotating tidal field of the secondary star.
	www.astro.fit.edu /cv/visualizations.html (470 words)

	Modeling of Cast Systems Using Smoothed-Particle Hydrodynamics (Site not responding. Last check: 2007-11-07)
		The ability of SPH to predict the detailed filling patterns of real large-scale automotive die castings is demonstrated in this study, and the use of SPH simulation for wheel shape optimization in ingot casting based on minimizing oxide generation while increasing the throughput is also presented.
		The particles are moving interpolation points that carry with them (convect) physical properties and state information, such as the mass of the fluid that the particle represents, its temperature, momentum, enthalpy, density, and other properties.
		The inter-particle forces are calculated by smoothing the information from nearby particles in a way that ensures that the resultant particle motion is consistent with the motion of a corresponding real fluid, as determined by the governing equation (e.g., the Navier-Stokes equations).
	www.tms.org /pubs/journals/JOM/0403/Cleary-0403.html (2953 words)

	Physically-Based Fluid Modeling using Smoothed Particle Hydrodynamics (Site not responding. Last check: 2007-11-07)
		Presented is a new method of modeling fluid for computer graphics using particle systems with fluid dynamics.
		The realism was achieved through the use of fluid dynamics equations from a computational fluid dynamics method known as Smoothed Particle Hydrodynamics.
		Other more efficient methods of surface generation need to be researched, as well as the inclusion of other hydrodynamic phenomena such as melting and cooling.
	www.plunk.org /~trina/thesis/html/thesis_toc.html (164 words)

	David Weinberg: SPH Images
		The simulation uses 262,144 dark matter particles and 262,144 gas particles, some of which are converted to collisionless "star" particles during the course of the simulation.
		Note that many of the "star" particles from the previous view are also gas particles (see KWH for a discussion of these dual-identity, star-gas particles).
		Almost the same as the first image (full box at z=2, gas particles color coded by temperature), except that particles more than 1000 times the mean density and with temperature less than 30,000 degrees are plotted as heavier green dots.
	www-astronomy.mps.ohio-state.edu /~dhw/Sph/sph.html (792 words)

	[No title]
		This is because the particles may only fill a fraction of the simulation domain and they have the same dynamic characteristics as the contact-detection problem.
		In the 1st figure, particles are used to model the earth as a penetrator passes thru.
		Fuel dispersal from the torn wing is modeled with SPH particles.
	www.cs.sandia.gov /~sjplimp/pronto.html (997 words)

	Using a Three-Dimensional Smoothed Particle Hydrodynamics Method for Wave Impact on a Tall Structure (Site not responding. Last check: 2007-11-07)
		The impact of a single wave generated by a dam break with a tall structure is modeled with a three-dimensional version of the smoothed particle hydrodynamics method.
		The method is used to analyze the propagation of a long wave and the force it exerts on a tall structure located in a region with vertical boundaries.
		The effect of having a dry bed in front of the dam prior to the dam break versus a wet bed in the experiment is discussed.
	www.pubs.asce.org /WWWdisplay.cgi?0406125 (178 words)

	Peridier Library Abstract Archive (Site not responding. Last check: 2007-11-07)
		The ASPH method replaces the isotropic smoothing algorithm of standard SPH, in which interpolation is performed with spherical kernels of radius given by a scalar smoothing length, with anisotropic smoothing involving ellipsoidal kernels and tensor smoothing lengths.
		In standard SPH the smoothing length for each particle represents the spatial resolution scale in the vicinity of that particle, and is typically allowed to vary in space and time so as to reflect the local value of the mean interparticle spacing.
		This problem is remedied in ASPH, where each axis of the ellipsoidal smoothing kernel for a given particle is adjusted so as to reflect the different mean interparticle spacings along different directions in the vicinity of that particle.
	www.as.utexas.edu /templates/397.html (459 words)

	Smoothed Particle Hydrodynamics. (Site not responding. Last check: 2007-11-07)
		Smoothed Particle Hydrodynamics: Theory and Application to Non-spherical Stars.
		Smoothed Particle Hydrodynamics Applied to Relativistic Spherical Collapse.
		Smoothed Particle Hydrodynamics Simulations of Ultrarelativistic Shocks with Artificial Viscosity.
	laplace.physics.ubc.ca /People/inaki/sph.html (81 words)

	SMOOTHED PARTICLE HYDRODYNAMICS
		This is the first-ever book on smoothed particle hydrodynamics (SPH) and its variations, covering the theoretical background, numerical techniques, code implementation issues, and many novel and interesting applications.
		An SPH source code is provided, making this a friendly book for readers and SPH users.
		Readers can easily learn from the examples illustrated in the book, write their own SPH codes, and test the validity of the numerical method.
	www.worldscibooks.com /engineering/5340.html (263 words)

	Untitled Document
		Smoothed particle hydrodynamics is one of the powerful computational tools of modern nonrelativistic astrophysics.
		In this presentation, relations between the ideas of smoothed particle hydrodynamics (SPH) and principles of relativity will be considered.
		A detailed discussion of foundations of foundations of manifestly covariant SPH will be provided.
	www4.ncsu.edu /~lkn/math-physics-seminar (440 words)

	8.1.3 Smoothed Particle Hydrodynamics (SPH) (Site not responding. Last check: 2007-11-07)
		Note: SPH is not restricted to compressible inviscid flow.
		By picking the properties of these particles appropriately one can mimick a free surface or a ``sticky'' solid boundary.
		Comparison of Smoothed Particle Hydrodynamics with an Eulerian finite-difference calculation.
	homepage.univie.ac.at /franz.vesely/cp0102/dx/node118.html (352 words)

	Modeling Fluid Flow using Smoothed Particle Hydrodynamics
		We have implemented a fluid flow simulation using the smoothed particle hydrodynamics (SPH) method.
		We use periodic boundary conditions (particles flowing off the right side wrap around to the left) and no slip conditions (friction is exhibited along the surface of boundary shapes).
		Utilities can be used to compare differences in particle attributes between runs and also trace the desired properties of a particle through time.
	www.keithv.com /project (480 words)

	[No title] (Site not responding. Last check: 2007-11-07)
		These methods try to capture the hydrodynamic behaviour in a much more efficient way that Molecular Dynamics, even if they apparently do not correspond to any discretization method of the hydrodynamic equations governing the time evolution of the continuum hydrodynamic fields.
		But even in the absence of conservative forces in the model (for which the kinetic theory predictions for the transport coefficients should be good), deviations of the measured quantities from the theoretical predictions have been reported.
		assigning a more precise definition to the mesoscopic fluid particle, understanding the physical origin of the conservative forces in the model and carrying out a systematic study of the region of parameters more suitable for the simulations of hydrodynamical problems involving the complex fluids.
	www.fisfun.uned.es /~mserrano/research.html (1188 words)

	Conservation in Viscous Flows Using Adaptive Smoothed Particle Hydrodynamics (Site not responding. Last check: 2007-11-07)
		Adaptive Smoothed Particle Hydrodynamics (ASPH) is a generalized form of Smoothed Particle Hydrodynamics (SPH) which allows improved treatment of strongly anisotropic hydrodynamic phenomena.
		The error is traced directly to the neglect of the surface terms when deriving the (A)SPH form of the hydrodynamic equations.
		Finally, we propose a new scheme for using a mass averaged kernel function instead of the traditional volume averaging of SPH.
	www.aas.org /publications/baas/v26n4/aas185/abs/S5504.html (227 words)

	Smoothed Particle Hydrodynamics (Site not responding. Last check: 2007-11-07)
		SPH Postings maintained by the CDF people - includes lots of links
		SPH and N-Body Codes collected by Peter Englmaier @ Basel
		SPH Simulations of CV Accretion Disks by Miller, Simpson and Wood @ Texas
	astronomy.swin.edu.au /~smaddiso/misc/sph.html (77 words)

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