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Mixing of fluids due to eddy currents
dynamics, eddy diffusion, eddy dispersion, or turbulent diffusion is a process by which fluid substances mix together due to eddy motion. These eddies can vary
Eddy_diffusion
Swirling and reverse current in a turbulent flow regime
plans. Vortex Eddy pumping - component of vertical motion in eddies relevant for biology and biogeochemistry Eddy diffusion Haida Eddies Irminger Rings
Eddy_(fluid_dynamics)
Index of articles associated with the same name
Mass diffusivity, molecular diffusivity (often called "diffusion coefficient") Eddy diffusion, eddy diffusivity Kinematic viscosity, characterising momentum
Diffusivity
Transport of dissolved species from the highest to the lowest concentration region
enhances high gradients Atomic diffusion, in solids Bohm diffusion, spread of plasma across magnetic fields Eddy diffusion, in coarse-grained description
Diffusion
American chemist credited with the invention of field flow fractionation
well as other separation techniques, including non-equilibrium, diffusion & eddy diffusion, pressure changes, flow in paper and thin-layer chromatography
J._Calvin_Giddings
Topics referred to by the same term
equation Eddy diffusion Anomalous diffusion, the movement of particles from a region of lower concentration to a region of higher concentration Diffusion MRI
Diffusion_(disambiguation)
Method of utilizing water in magnetic resonance imaging
Diffusion-weighted magnetic resonance imaging (DWI or DW-MRI) is the use of specific MRI sequences as well as software that generates images from the
Diffusion-weighted magnetic resonance imaging
Diffusion-weighted_magnetic_resonance_imaging
Layer of an atmosphere where the bulk gases are homogeneously mixed
where the bulk gases are homogeneously mixed due to turbulent mixing or eddy diffusion. The bulk composition of the air is mostly uniform so the concentrations
Homosphere
Escape of gases from the atmosphere
mol + Φ i eddy {\displaystyle \Phi _{i}=\Phi _{i}^{\text{mol}}+\Phi _{i}^{\text{eddy}}} The vertical eddy diffusion flux is given by Φ i eddy = − K n d
Diffusion-limited_escape
Altitude in the Earth's atmosphere below which turbulent mixing dominates
where the coefficient of Eddy diffusion is equal to the coefficient of molecular diffusion. Because the molecular diffusion coefficient is dependent on
Turbopause
differential equation considering only the turbulent diffusion approximation in eddy diffusion: ∂ c i ∂ t + u ¯ j ∂ ( c ) ∂ x j = ∂ ∂ x j ( K j j ∂ (
Turbulent_diffusion
Loops of electric current induced within conductors by a changing magnetic field
In electromagnetism, an eddy current (also called Foucault's current) is a loop of electric current induced within conductors by a changing magnetic field
Eddy_current
Zone in which oxygen saturation in seawater in the ocean is at its lowest
A.; Bianchi, D.; Pradal, M.A. (2013). "Critical role for mesoscale eddy diffusion in supplying oxygen to hypoxic ocean waters". Geophysical Research Letters
Oxygen_minimum_zone
Relation in chromatography
power of the column [m] A = Eddy-diffusion parameter, related to channeling through a non-ideal packing [m] B = diffusion coefficient of the eluting particles
Van_Deemter_equation
(TKE) to improve parameterization of eddy diffusion coefficient K c {\displaystyle K_{c}} to account for large eddy transport in typical CBL. TKE gives
Convective planetary boundary layer
Convective_planetary_boundary_layer
Long rolls of counter-rotating air
layer flow and fluxes. The linear approximation, the eddy diffusivity equation with an eddy diffusion coefficient K, allowed Ekman to obtain a simple logarithmic
Horizontal_convective_rolls
Strait connecting the Atlantic and Caribbean
Pichincho can elevate the turbulent vertical diffusivity values (or eddy diffusion), and with a reduction of the Richardson number at the base of the pycnocline
Mona_Passage
British physicist and mathematician (1886–1975)
Cambridge University Press, ISBN 0-521-46121-9 Taylor, G. I. (January 1915). "I. Eddy motion in the atmosphere" (PDF). Philosophical Transactions of the Royal
G._I._Taylor
Form of chromatography
diameter/solute diffusion coefficient in the mobile phase) A, B, and C are constants related to solute flow anisotropy (eddy diffusion), molecular longitudinal
Micellar liquid chromatography
Micellar_liquid_chromatography
Process of mechanically stirring a heterogeneous mixture to homogenize it
of reactants and products to and from the particles. The associated eddy diffusion increases the rate of mass transfer within the bulk of the fluid, and
Mixing_(process_engineering)
Dutch physicist (1918–2004)
height equivalent theoretical plate, A is the eddy-diffusion parameter, B is the longitudinal diffusion coefficient of the eluting material in the longitudinal
Jan_van_Deemter
Accumulation of unwanted material on solid surfaces
fouling surface. This transport is often by molecular or turbulent-eddy diffusion, but may also occur by inertial coasting/impaction, particle interception
Fouling
Mathematical model for turbulence
Large eddy simulation (LES) is a mathematical model for turbulence used in computational fluid dynamics. It was initially proposed in 1963 by Joseph Smagorinsky
Large_eddy_simulation
Physical phenomenon
is different. Anomalous diffusion is the result of turbulence. Regions of higher or lower electric potential result in eddies because the plasma moves
Bohm_diffusion
Mathematical modeling of chemical processes
reaction involves solving conservation equations describing convection, diffusion, and reaction source for each component species. ∂ ( ρ Y i ) ∂ t + ∇ ⋅
Chemical_reaction_model
Climate model
was broadened to the polar regions. It included parametrized drag, eddy diffusion, radiative processes but no topography. It could simulate the day-night
Leith_AGCM
Mathematical concept applicable to physics
particles. In turbulent flows, the transport by eddy motion can be expressed as a grossly increased diffusion coefficient. In quantum mechanics, particles
Flux
Resistance of a fluid to shear deformation
"Revised Enskog theory for Mie fluids: Prediction of diffusion coefficients, thermal diffusion coefficients, viscosities, and thermal conductivities"
Viscosity
Dimensionless quantity in magnetohydrodynamics
a magnetic field by the motion of a conducting medium to the magnetic diffusion. It is the magnetic analogue of the Reynolds number in fluid mechanics
Magnetic_Reynolds_number
heat conduction were important for the laboratory measurements, but eddy diffusion of heat and momentum dominated the atmospheric cells. Wind shear must
Remote sensing atmospheric boundary layer
Remote_sensing_atmospheric_boundary_layer
represents the isopycnal-flattening effects of eddies as advection (often misinterpreted as diffusion of surfaces). This parametrization is not perfect
Parametrization (atmospheric modeling)
Parametrization_(atmospheric_modeling)
Mathematical model of turbulence
eddy-viscosity based turbulence models, while being computationally cheaper than Direct Numerical Simulations (DNS) and Large Eddy Simulations. Eddy-viscosity
Reynolds stress equation model
Reynolds_stress_equation_model
Model in combustion
categories oxygen-rich diffusion flames and oxygen-deficient. Flame shapes also depend on the discharging velocity of fuel and air. Eddies inside the air flow
Eddy_break-up_model
(eddy currents). Due to ohmic losses, the induced surface currents dissipate—this causes a change in the magnetic field, which induces subsequent eddy
Transient_electromagnetics
Process by which aerosol particles collect onto solid surfaces
through sedimentation (settling) or impaction processes, while Brownian diffusion has the greatest influence on small particles. This is because very small
Deposition_(aerosol_physics)
Eddington number Eddington–Finkelstein coordinates Eddy (fluid dynamics) Eddy current Eddy diffusion Eden growth model Edgar Buckingham Edgar Choueiri
Index_of_physics_articles_(E)
Gas produced naturally within marshes, swamps and bogs
air–water interface. The diffusion can be accelerated and intensified by upwelling, such as the motion from turbulent eddies, and cooling processes. At
Marsh_gas
Motion characterized by chaotic changes in pressure and flow velocity
which produces a hierarchy of eddies. Eventually this process creates structures that are small enough that molecular diffusion becomes important and viscous
Turbulence
Ratio of a fluid's kinematic viscosity to mass diffusivity
characterize fluid flows in which there are simultaneous momentum and mass diffusion convection processes. It was named after German engineer Ernst Heinrich
Schmidt_number
Process in plasma physics
plasmas with oppositely directed magnetic fields together, resistive diffusion is able to occur on a length scale much shorter than a typical equilibrium
Magnetic_reconnection
Electrical resistance of a thin film
as a four-point probe measurement) or indirectly by using a non-contact eddy-current-based testing device. Sheet resistance is invariable under scaling
Sheet_resistance
Dimensionless ratio of viscous to Coriolis forces
for the thickness of an Ekman layer, a boundary layer in which viscous diffusion is balanced by Coriolis effects, rather than the usual convective inertia
Ekman_number
Turbulence model
Transport turbulence model, or SST, is a widely used and robust 2-equation eddy-viscosity turbulence model used in Computational Fluid Dynamics. The model
Menter's Shear Stress Transport
Menter's_Shear_Stress_Transport
Mean kinetic energy per unit mass of eddies in turbulent flow
kinetic energy (TKE) is the mean kinetic energy per unit mass associated with eddies in turbulent flow. Physically, the turbulence kinetic energy is characterized
Turbulence_kinetic_energy
Heat transfer due to the movement of fluid
convective heat transfer involves the combined processes of conduction (heat diffusion) and advection (heat transfer by bulk fluid flow). Convection is usually
Convection_(heat_transfer)
Spanish cyclist (1945–1996)
Retrieved 2007-07-20. Merckx, Eddy (1972). Plus d'un Tour dans mon sac; Mes carnets de route 1972. Editions arts et voyages diffusion gamma. "CLAS - RAZESA"
José_Manuel_Fuente
Partial differential equation
equation is a fundamental partial differential equation and convection–diffusion equation occurring in various areas of applied mathematics, such as fluid
Burgers'_equation
Norwegian actress
ABCs of Death Frau Scheisse (voice) segment "H is for Hydro-Electric Diffusion" Escape (Flukt) Dagmar 2013 Kill Buljo 2 Anniken Skaiwalker Grandmother
Ingrid_Bolsø_Berdal
Combustion models of fuel reactions and energy release for computational fluid dynamics
model also takes into account an additional assumption that the mass diffusion coefficients of all species are equal. Owing to this additional assumption
Combustion_models_for_CFD
Ratio of inertial to viscous forces acting on a liquid
intersect or even move counter to the overall direction of the flow (eddy currents). These eddy currents begin to churn the flow, using up energy in the process
Reynolds_number
Vaporization of a liquid from its surface
the evaporation surface decreasing with flow velocity, decreasing the diffusion distance in the stagnant layer. The amount of minerals dissolved in the
Evaporation
Length scale used in fluid dynamics
droplet of fluid that will diffuse in the same time it takes the energy in an eddy of size η to dissipate. The Batchelor scale can be determined by: λ B = η
Batchelor_scale
American inventor, executive, and musician (1943–2015)
Calmes' lifelong fascination with music first showed itself when playing Eddy Arnold songs on the ukulele, before learning guitar at the age of 15. The
Jack_Calmes
Process of water movement through a plant
decrease in hydrostatic pressure in the upper parts of the plants due to the diffusion of water out of stomata into the atmosphere. The word transpiration comes
Transpiration
Immortal bird that is cyclically reborn
among them such as a Napoleon, have already been licked into that high-eddying Flame, and like moths consumed there. Still also have we to fear that incautious
Phoenix_(mythology)
Haida Eddies are episodic, clockwise rotating ocean eddies that form during the winter off the west coast of British Columbia's Haida Gwaii and Alaska's
Haida_Eddies
Former French television channel (1986–1987)
allocated the sixth channel slot to M6. Serge Gainsbourg, Johnny Hallyday, Eddy Mitchell and other personalities, called on the government in vain to try
TV6_(French_TV_channel)
Model of electrically conducting fluids
magnetic Reynolds numbers, in which magnetic induction dominates magnetic diffusion at the velocity and length scales under consideration. Consequently, processes
Magnetohydrodynamics
Type of explosion
combustion). In a deflagration, the flame front grows through heat transfer and diffusion at speeds that are below the speed of sound, while in contrary in detonation
Deflagration to detonation transition
Deflagration_to_detonation_transition
the concept of collective intelligence and knowledge ecology (Pór 2000). Eddy et al. (2014) use information ecology for science-policy integration in ecosystems-based
Information_ecology
Flow where fluid particles follow smooth paths in layers
surface. Laminar flow is a flow regime characterized by high momentum diffusion and low momentum convection. When a fluid is flowing through a closed
Laminar_flow
Research of materials
evolving in materials including shape, size, composition and structure. Diffusion is important in the study of kinetics as this is the most common mechanism
Materials_science
British milliner (born 1957)
Covent Garden, London as of 2013. In 1990, Jones launched a Miss Jones diffusion line for hats, and in 1993, this was followed by Jonesgirl which was exclusive
Stephen_Jones_(milliner)
introduced during the same period. Also of note is the fact that the period of diffusion of a technology can begin modestly and can extend well beyond the "age"
Technological and industrial history of Canada
Technological_and_industrial_history_of_Canada
législatives 2024 : LFI saisit la justice contre Renaissance pour « diffusion de fausses informations »". Le Monde. 28 June 2024. Archived from the
2024 French legislative election
2024_French_legislative_election
Fluid dynamics physicist
1976; Cambridge University Press). The terms Townsend's eddies (or Townsend's wall-attached eddies), Batchelor–Howells–Townsend spectrum and Townsend–Perry
Albert_Alan_Townsend
Belgian French-language television channel
the Belgian version of the JTL show, presented by Jean-Charles De Keyser, Eddy de Wilde and Bibiane Godfroid, was launched from a small studio in Roosevelt
RTL-TVI
Equations of motion for viscous fluids
acceleration ⏞ Inertia (per volume) = ∂ ∂ − ∇ w ⏟ Internal source + ν ∇ 2 u ⏟ Diffusion ⏞ Divergence of stress + g ⏟ External source . {\displaystyle \overbrace
Navier–Stokes_equations
Deep geological repository for radioactive waste
WIPP is located approximately 26 miles (42 km) east of Carlsbad, in eastern Eddy County, in an area known as the southeastern New Mexico nuclear corridor
Waste_Isolation_Pilot_Plant
One of the five families of stainless steel
penetrant inspection method but not the magnetic particle inspection method. Eddy-current testing may also be used. Grade EN 1.4980 (also known as A286) is
Austenitic_stainless_steel
Materials engineered to have properties that have not yet been found in nature
transverse waves), and diffusion equations (pertaining to diffusion processes). Crafted to govern a range of diffusion activities, diffusion metamaterials prioritize
Metamaterial
Name list
first monk. The later saint Anthony of Padua also contributed to its diffusion. Equivalents include Antoine in French; Antonio in Italian and Spanish;
Anthony
137- 170, 2006. Edwards, J. R., Franklin, R., and Liou, M.-S., “Low-Diffusion Flux-Splitting Methods for Real Fluid Flows with Phase Transitions,” AIAA
Advection upstream splitting method
Advection_upstream_splitting_method
Electricity generation by nuclear fusion
reactor volume larger, which reduces the rate of leakage due to classical diffusion. This is why ITER is so large. In contrast, inertial confinement systems
Fusion_power
Unstable wave
interior of the wave after breaking, as the eddies on the surface become more viscous. Advection and molecular diffusion play a part in stretching the vortex
Breaking_wave
1997 American crewed spaceflight
the Sodium Sulfur Battery Experiment (NaSBE), the Turbulent GAS Jet Diffusion (G-744) experiment, and the Autonomous EVA Robotic Camera/Sprint (AERCam
STS-87
Movement of a substance between compartments
molecules across a membrane: in this case, flux is defined by the rate of diffusion or transport of a substance across a permeable membrane. Except in the
Flux_(biology)
Energy transfer between scales of motion
from k to k + dk. The largest eddies have low wavenumber, and the small eddies have high wavenumbers. Since diffusion goes as the Laplacian of velocity
Energy_cascade
1962 A Dialogue for This Decade: Sterling McMurrin B&W 20m June 5, 1962 Diffusion and Osmosis Stanley Croner (producer); Charles F. Finance color 14m August
List of Encyclopædia Britannica Films titles
List_of_Encyclopædia_Britannica_Films_titles
Call Sony Computer Entertainment 2003-03-20JP Arcade Action: 30 Games SG Diffusion Phoenix Games 2004-11-19PAL Arcade Classics Volume One Play It! Play It
List of PlayStation 2 games (A–K)
List_of_PlayStation_2_games_(A–K)
Source of gas emissions
relatively slow diffusion of methane through the soil. Additionally, because methane can travel more quickly through soil than water, diffusion plays a much
Greenhouse gas emissions from wetlands
Greenhouse_gas_emissions_from_wetlands
Layering of a body of water due to density variations
until it has either mixed with its surroundings through turbulence and diffusion to match the density of the surroundings, reaches a depth where it has
Stratification_(water)
f)\,\,\,\forall {v}_{h}\in {\mathcal {V}}_{h}} Consider an advection–diffusion problem: { − μ Δ u + b ⋅ ∇ u = f in Ω u = 0 on ∂ Ω {\displaystyle
Variational_multiscale_method
Non-fatal disease of the lungs
function. The majority (approximately 80%) of patient will have decrease diffusion capacity while fewer patients (approximately 20%) will have issues with
Diffuse_alveolar_damage
Widespread norms in a society
constantly evolving and occurs uniquely in place and time. It forms currents and eddies, and represents a complex of mutually interdependent perspectives and values
Popular_culture
1985 film by Robert Zemeckis
reduced to twenty frames. The bolt was drawn in black ink on white paper; diffusion effects and a glow were added by the optical department. The DeLorean
Back_to_the_Future
Transport protein
and mapped in 1989. At the cell surface, GLUT4 permits the facilitated diffusion of circulating glucose down its concentration gradient into muscle and
GLUT4
Water purification process
the solution's pressure and concentration. RO instead involves solvent diffusion across a membrane that is either nonporous or uses nanofiltration with
Reverse_osmosis
Law of electrical current and voltage
{\displaystyle \eta =1/\mu _{0}\sigma } . Electronics portal Fick's law of diffusion Hopkinson's law ("Ohm's law for magnetics") Maximum power transfer theorem
Ohm's_law
Model used in computational fluid dynamics
the transport of k or ε by advection, equals the transport of k or ε by diffusion, plus the rate of production of k or ε, minus the rate of destruction
K-epsilon_turbulence_model
American jazz trumpeter and singer (1901–1971)
2009. Morgenstern, Dan (1994), "Louis Armstrong and the Development and Diffusion of Jazz", in Miller, Marc H. (ed.), Louis Armstrong: A Cultural Legacy
Louis_Armstrong
Square in Paris, France
1960s and 1970s. Developed by the Centre de Recherche et d'Etude pour la Diffusion du Français (CREDIF) at the Ecole Normale Superieure de Saint-Cloud in
Place_d'Italie
Canadian artist and fashion designer (born 1982)
overseeing the entire womenswear range. In 2013, Wu launched his debut diffusion line (a collection designed with a younger target in mind and retailed
Jason_Wu
Liquid that is attracted by poles of a magnet
D d φ d x {\displaystyle J=-D{\frac {d\varphi }{dx}}} Fick's laws of diffusion Laws Conservations Mass Momentum Energy Inequalities Clausius–Duhem (entropy)
Ferrofluid
Strong increase in phytoplankton abundance that typically occurs in the early spring
Increasing light intensity (in shallow water environments). Eddies (see ‘The role of eddies in the onset of the North Atlantic spring bloom’) A 2012 study
Spring_bloom
Flow of the cytoplasm inside the cell
approximately 0.1 mm[vague]. In smaller cells, the diffusion of molecules is more rapid, but diffusion slows as the size of the cell increases, so larger
Cytoplasmic_streaming
Sixth planet from the Sun
reactions with the resulting products being carried downward by eddies and diffusion. This photochemical cycle is modulated by Saturn's annual seasonal
Saturn
Sports car
wider rear wing with larger end plates, new front plate with optimised diffusion under the front end. As part of NASCAR's embracing of GT3 in their Grand
Audi_R8_(Type_42)
Fluid flow revolving around an axis of rotation
streamlines is said to be solenoidal. As long as the effects of viscosity and diffusion are negligible, the fluid in a moving vortex is carried along with it
Vortex
Lagrangian ocean analysis has numerous applications, from modelling the diffusion of tracers, through the dispersal of aircraft debris and plastics, to
Lagrangian_ocean_analysis
EDDY DIFFUSION
EDDY DIFFUSION
Girl/Female
German, Hebrew
Pleasure; Enjoyment
Girl/Female
French German
Nobility. French form of the Old German Adalheidis, a compound of 'athal' (noble) and 'haida'...
Boy/Male
American, Anglo, British, Christian, Danish, Dutch, English, French, German, Gothic, Netherlands, Swedish, Swiss
Names Beginning with Ed; Form of Edward; Guardian of Prosperity; Wealthy Defender; Wealthy Protector; Wealthy Guard
Surname or Lastname
English (Devon)
English (Devon) : from the Middle English personal name Edwy, Old English Ēadwīg, composed of the elements ēad ‘prosperity’, ‘fortune’ + wīg ‘war’.
Surname or Lastname
English
English : from a pet form of Eade.
Female
Italian
 Pet form of Italian Edvige, EDDA means "contending battle." Compare with another form of Edda.
Boy/Male
French American English Greek
Prosperous protector. A FrenchOld English name Eadmund, meaning rich or happy, and protection.
Female
English
Pet form of English Adelaide, ADDY means "noble sort."
Surname or Lastname
English and Scottish
English and Scottish : variant spelling of Eddy.
Female
English
 Variant spelling of English Eda, EDDA means "rich battle." Compare with another form of Edda.
Surname or Lastname
English
English : probably a variant of Eade. This name is also found in Normandy, France.
Boy/Male
Hebrew English
Son of Adam: Man of the red earth.
Male
English
Variant spelling of English Eddie, EDDY means "guardian of prosperity."
Surname or Lastname
English
English : from a pet form of Eade.
Surname or Lastname
English (West Yorkshire)
English (West Yorkshire) : from the Middle English personal name Addy, a pet form of Adam.
Surname or Lastname
English
English : from the Middle English personal name Ode (see Ott).
Girl/Female
Norse Dutch German
Poetry.
Surname or Lastname
English
English : unexplained.
Boy/Male
French American English Swedish
Prosperous protector. A FrenchOld English name Eadmund, meaning rich or happy, and protection.
Surname or Lastname
English
English : perhaps, as Reaney suggests, a patronymic from a personal name, a short form of Edwin or Edward, or for Eade 1.
EDDY DIFFUSION
EDDY DIFFUSION
Boy/Male
Hindu, Indian
Star
Boy/Male
Tamil
Shanti Priya | ஷாஂதிபà¯à®°à®¿à®¯à®¾Â
Peace loving
Boy/Male
Hindu
Mine of nectar
Boy/Male
Shakespearean
The Taming of the Shrew' A servant to Petruchio.
Boy/Male
Sikh
God of Yoga
Girl/Female
Tamil
One who arouses tender feelings in others, River Narmada
Surname or Lastname
English and Scottish (of Norman origin)
English and Scottish (of Norman origin) : habitational name from Falaise in Calvados, France, the birthplace of William the Conqueror. The place is so named from Old French falaise ‘cliff’ (a word of Germanic origin).Scottish and northern Irish : reduced form of McFalls.
Girl/Female
German
Renowned warrior.
Boy/Male
Hindu
God of Yoga (Lord Shiva), One who practices Yoga
Girl/Female
Hindu, Indian
Tasty
EDDY DIFFUSION
EDDY DIFFUSION
EDDY DIFFUSION
EDDY DIFFUSION
EDDY DIFFUSION
pl.
of Eddy
n.
A pet name for a donkey.
n.
A current of water or air moving in a circular direction; a whirlpool.
imp. & p. p.
of Eddy
n.
A whirling motion; an eddy, as of water; a whirl.
a.
Easily irritated; sharp; as, an edgy temper.
a.
Having some of the forms, such as drapery or the like, too sharply defined.
v. i.
To move as an eddy, or as in an eddy; to move in a circle.
pl.
of Neddy
v. i.
To run swiftly round, as a small stream flowing among stones or other obstructions; to eddy; also, to make a murmuring sound, as water does in running over or through obstructions.
n.
That which swallows irretrievably; a whirlpool; a sucking eddy.
v. i.
To whirl; to eddy.
v. t.
To collect as into an eddy.
pl.
of Edda
n.
A current of air or water running back, or in a direction contrary to the main current.
n.
A backset; a countercurrent; an eddy.
p. pr. & vb. n.
of Eddy
n.
To whirl, or cause to whirl, as in an eddy.
n.
The religious or mythological book of the old Scandinavian tribes of German origin, containing two collections of Sagas (legends, myths) of the old northern gods and heroes.
n.
A circle made by the notion of a fluid; an eddy; a ripple.