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Aspect of Eulerian fluid dynamics
the knowledge of Moreau's paper. This helicity invariant is an extension of Woltjer's theorem for magnetic helicity. Let u ( x , t ) {\displaystyle \mathbf
Hydrodynamical_helicity
Scientific law regarding conservation of a physical property
quantity Some kinds of helicity are conserved in dissipationless limit: hydrodynamical helicity, magnetic helicity, cross-helicity. Principle of mutability
Conservation_law
Element used on cylindrical structures
A helical strake, also known as a Scruton strake, is a helix-shaped fin arranged along a structure to disrupt fluid flow. It serves to mitigate fatigue
Helical_strake
Measure of magnetic field topology
In plasma physics, magnetic helicity is a measure of the linkage, twist, and writhe of a magnetic field. Magnetic helicity is used to analyze systems with
Magnetic_helicity
Type of mechanical seal
the typical groove topologies used in hydrodynamic seals, with a summary of their characteristics: Spiral (Helical) Groove Wave or Wavy Groove V‑Grooves
Hydrodynamic_seal
Density variable used in oceanography
the neutral helicity H = N ⋅ ∇ × N {\displaystyle H=\mathbf {N} \cdot \nabla \times \mathbf {N} } (related in form to hydrodynamical helicity) must be zero
Neutral_density
Italian-British applied mathematician
interpretation of hydrodynamical helicity and providing a rigorous derivation of the linking number of an isolated flux tube from the helicity of classical
Renzo_L._Ricca
Theorem in plasma physics
(\nabla \times \mathbf {A} )\ dV.} Chandrasekhar–Kendall function Hydrodynamical helicity Woltjer, L. (June 1958). "A Theorem on Force-Free Magnetic Fields"
Woltjer's_theorem
Italian polymath (1452–1519)
wire. He made substantial discoveries in anatomy, civil engineering, hydrodynamics, geology, optics, and tribology, but he did not publish his findings
Leonardo_da_Vinci
Marine propeller with a non-rotating nozzle
cross-section of the shroud has the form of a foil, and the shroud can offer hydrodynamic advantages over bare propellers, under certain conditions. Advantages
Ducted_propeller
Quantification of bulk fluid movement
meter or through a progressive cavity created by rotating oval gears or a helical screw. Because they are used for domestic water measurement, piston meters
Flow_measurement
Type of secondary structure of proteins
cigar-like) hydrodynamic shape of a helix, or its large dipole moment. Different amino-acid sequences have different propensities for forming α-helical structure
Alpha_helix
All Latin and Greek roots beginning with H
heliotherapy, heliotrope, heliotropic, heliotropism, helium, parhelion, perihelion helic- something twisted or spiral Greek ϝελίσσω, ἑλίσσειν (helíssein), ἕλιξ,
List of Greek and Latin roots in English/H
List_of_Greek_and_Latin_roots_in_English/H
Generalization of Hamiltonian mechanics involving multiple Hamiltonians
Blender, R. (1993). "A Nambu representation of incompressible hydrodynamics using helicity and enstrophy". Journal of Physics A. 26 (22): 1189–1193. Bibcode:1993JPhA
Nambu_mechanics
Equations of motion for viscous fluids
and are characterized by positive and negative helicity respectively. The solution with positive helicity is given by: u x = 4 2 3 3 U 0 [ sin ( k x −
Navier–Stokes_equations
flow Helen Quinn Helen T. Edwards Heliac Helically Symmetric Experiment Helicity (particle physics) Helicity basis Helicon (physics) Helicon discharge
Index_of_physics_articles_(H)
Method of removing particulates from a fluid stream through vortex separation
within a cylindrical or conical container called a cyclone. Air flows in a helical pattern, beginning at the top (wide end) of the cyclone and ending at the
Cyclonic_separation
Device for separating/sorting slurry or particles
combination of the solid particle density as well as the particle's hydrodynamic properties (e.g. drag). The device consists of a tower, around which
Spiral_separator
Processes by which whistles make sound
sound-making process is an example of the application of fluid dynamics or hydrodynamics and aerodynamics. The principles relevant to whistle operation also
Physics_of_whistles
Motor manufacturer
Sleeve bearings Sleeveoil hydrodynamic bearings Take up frames Shaft mount helical Helical screw conveyor Right angle worm Helical inline Planetary Energy
ABB_Motors_and_Mechanical
Water turbine which uses the principle of the Archimedean screw
transiting the screw from high to low elevation generates a torque on the helical plane surfaces, causing the screw to rotate. The Archimedes screw generator
Screw_turbine
Type of rotary pump with helical rotor
progressing cavity pump normally consists of a helical rotor and a twin helix, twice the wavelength helical hole in a stator. The rotor seals tightly against
Progressing_cavity_pump
Hydrology computer program
2-dimensional hydrodynamic model that can simulate dynamic as well as quasi-steady or steady-state hydrodynamic solutions. The hydrodynamic model solves
MIKE_21C
Elementary particle with extremely low mass
property of chirality that is closely related to helicity, and for practical purposes the same as the helicity of the ultra-relativistic neutrinos that can
Neutrino
American technology company
2003 CFX Fluid dynamics simulation Not disclosed 2005 Century Dynamics Hydrodynamics simulation tools 5 M 2005 Harvard Thermal Inc. Simulating cooling and
Ansys
Mechanical connection between two objects
to another To slip when overload occurs A beam coupling, also known as helical coupling, is a flexible coupling for transmitting torque between two shafts
Coupling
at least in part by the helicity of certain sub-regions of the flow field, a topological invariant of the equations. Helicity plays a central role in
Topological_fluid_dynamics
Species of protozoan parasite
R, Molina-Portela P, Mott H, Carrington M, Raper J (November 2009). "Hydrodynamic gene delivery of baboon trypanosome lytic factor eliminates both animal
Trypanosoma_brucei
Pseudovector field describing the local rotation of a continuum near some point
equation is a prognostic equation. Related to the concept of vorticity is the helicity H ( t ) {\displaystyle H(t)} , defined as H ( t ) = ∫ V v ⋅ ω d V {\displaystyle
Vorticity
Australian mathematician
centenary of the publication of Michell's famous 1898 paper on ship hydrodynamics, "The wave resistance of a ship", Phil. Mag. (5) 45 (1898) 106-123.
John_Henry_Michell
Motor vehicle
combined dry single-disc clutch and hydrodynamic torque converter. From the engine, the torque is sent to the hydrodynamic torque converter which provides
Unimog_405
Blender, R. (1993). "A Nambu representation of incompressible hydrodynamics using helicity and enstrophy". J. Phys. A. 26 (22): 1189–1193. Bibcode:1993JPhA
Hamiltonian_fluid_mechanics
Indian hydraulician and educator
turbulent boundary layer. Furthermore, he has discovered the zeroth law of helicity spectrum in the inertial sub-range of wall turbulence. In fluvial hydraulics
Subhasish_Dey
shape assumed by the SCR is controlled mainly by weight, buoyancy and hydrodynamic forces due to currents and waves. The shape of the SCR is well approximated
Steel_catenary_riser
been discovered in dolphins and squid. Their dermal teeth give them hydrodynamic advantages as they reduce turbulence while swimming. Unlike the scales
Shark_anatomy
3-speed automatic from 1963
The 3HP is a 3-speed Automatic transmission family with a hydrodynamic Torque converter with hydraulic control for passenger cars from ZF Friedrichshafen
ZF_3HP_transmission
Incorrect but seminal physical theory
medium of the vortex theory of atoms. Hermann Helmholtz, working on the hydrodynamics of idealized fluids, realized in the mid-19th century that the core
Vortex_theory_of_the_atom
Magnetic field oscillating amplified thruster, Plasma Engine Magnetic helicity Magnetic mirror Magnetic Prandtl number Magnetic pressure Magnetic proton
List of plasma physics articles
List_of_plasma_physics_articles
Copper alloy bushes ISO 4380 Plain bearings – Method of calculation of hydrodynamic thrust bearings (Rejected draft; now covered by ISO 12131-1) ISO 4381:2011
List of ISO standards 3000–4999
List_of_ISO_standards_3000–4999
heliotherapy, heliotrope, heliotropic, heliotropism, helium, parhelion, perihelion helic- something twisted or spiral Greek ϝελίσσω, ἑλίσσειν (helíssein), ἕλιξ,
List of Greek and Latin roots in English/H–O
List_of_Greek_and_Latin_roots_in_English/H–O
Rotational self-propulsion of organisms
Design for the Construction of a Biorobotic AUV Based on Biological Hydrodynamics" (PDF). Preprint. George Washington University. Archived from the original
Rotating locomotion in living systems
Rotating_locomotion_in_living_systems
Mechanical power source
fluid-pressure transmission. Non-positive displacement pumps, also called hydrodynamic pumps, produce a continuous flow, and do not tightly seal the fluid inside
Hydraulic_pump
Type of pump which uses the meshing of gears to push fluids
leakage and back flow. However, sometimes higher clearances help reduce hydrodynamic friction and improve efficiency. Gear backlash: High backlash between
Gear_pump
Electricity generation by nuclear fusion
412–425. Jarboe, T. R., et al. "Spheromak formation by steady inductive helicity injection." Physical Review Letters 97.11 (2006): 115003 Jarboe, T. R.
Fusion_power
Extinct genus of lizards
Michael W. (2011-11-16). "Three-Dimensionally Preserved Integument Reveals Hydrodynamic Adaptations in the Extinct Marine Lizard Ectenosaurus (Reptilia, Mosasauridae)"
Ectenosaurus
Extinct subclass of cephalopod molluscs
Their fossil shells usually take the form of planispirals, although some helically spiraled and nonspiraled forms (known as heteromorphs) have been found
Ammonoidea
Hydraulic machine
hydraulic machine composing of an outer cylinder and an inner cylinder with helical blades. It can be operated both as a pump and a power generator, though
Archimedes'_screw
American chemist (1920–2005)
In 1956, Zimm extended the Rouse model of Polymer Physics to include hydrodynamic interactions mediated by the solvent between different parts of the chain
Bruno_H._Zimm
Russian diesel multiple unit
reduce fuel consumption and maintenance costs, utilising a combination of hydrodynamic and electro-pneumatic braking, and a number of multiple unit components
RA3_multiple_unit
Device for mixing two fluid materials in a tube containing a series of baffles
p. 682. ISBN 978-0824753627. Gieseke, Thomas. "An Evaluation of the Hydrodynamics Mechanisms Which Drive the Performance of the Westfall Static Mixer"
Static_mixer
Type of tidal power generation technology
University and tested successfully near Quebec City, Canada, in 2009. A hydrodynamic efficiency of 40% has been achieved during the field tests. Venturi effect
Tidal_stream_generator
Method of construction
the courses follow helical paths between the imposts. The helicoid is a curved surface swept out by a radius moving in a helical path about an axial
Skew_arch
Toroidal vortex ring of air in water
creating a toroidal vortex with their flukes and injecting a bubble into the helical vortex currents thus formed. The dolphin will often then examine its creation
Bubble_ring
Line integral of the fluid velocity around a closed curve
ARCHIBALD CONSTABLE & CO. Prandtl, Ludwig (1922). APPLICATIONS OF MODERN HYDRODYNAMICS TO AERONAUTICS (PDF). United States: National Advisory Committee for
Circulation_(physics)
confine, and utilize positron plasmas Maxwell Prize (2014) John Bryan Taylor helicity conservation, bootstrap current, ballooning transformation, plasma theory
List_of_plasma_physicists
unconventional tidal stream turbine. It consists of two counter-rotating helical screws made from fiberglass, each attached to a gear-less permanent magnet
Development of tidal stream generators
Development_of_tidal_stream_generators
the stationary phase is retained by centripetal force: hydrostatic and hydrodynamic. In the hydrostatic method, the column is rotated about a central axis
Countercurrent_chromatography
Stefano (2004). The physics of inertial fusion: beam plasma interaction, hydrodynamics, hot dense matter. Meyer-ter-Vehn, Jürgen. Oxford: Clarendon Press.
History_of_nuclear_fusion
Part of a reciprocating engine
steel/iron with a helical spring backing to create the tension required for a close seal. Cast iron oil rings and rings with a helical spring backing have
Piston_ring
Subfield of astronomy
instability – Plasma instability in cosmic ray streaming regions. Magnetic helicity – Topological invariant conserved in MHD evolution of solar coronae. Magnetic
Outline_of_astrophysics
Predatory cartilaginous fishes
swimming muscles and thus saving energy. Their dermal teeth give them hydrodynamic advantages as they reduce turbulence when swimming. Some species of shark
Shark
Hard skeletal covering of fish
camouflage through the use of reflection and colouration, as well as possible hydrodynamic advantages. The term scale derives from the Old French escale, meaning
Fish_scale
Experiment testing the origin of life
H2 made up < 1% of the atmosphere of prebiotic Earth, but, in 2005, a hydrodynamic model of hydrogen escape predicted escape rates two orders of magnitude
Miller–Urey_experiment
State of matter with properties of both conventional liquids and crystals
topological defects with topological charges +1/2 and -1/2. Due to hydrodynamics, the +1/2 defect moves considerably faster than the -1/2 defect
Liquid_crystal
Structured carbon fibers
surface modification step. This process allows optimizing porosity, hydrodynamical properties and surface chemistry independently from each other, which
Carbon_nanofiber
and adaptive radiation of Neograptina. Gao, Tan & Wang (2025) study hydrodynamic properties of a model of Calyxdendrum (a graptolite with a morphology
2025_in_paleontology
Bioreactor with a light source to grow photosynthetic microorganisms
photobioreactor, which is built in a tapered geometry and which carries a helically attached, translucent double hose circuit system. The result is a layout
Photobioreactor
Device that transmits rotational power into linear thrust on a fluid
a rotating hub and radiating blades that are set at a pitch to form a helical spiral which exerts linear thrust upon a working fluid such as water or
Propeller
Fluid instability that causes turbulence in accretion disks
charges are subject to the influence of a magnetic field. In addition to hydrodynamical forces such as pressure and gravity, an element of magnetized fluid
Magnetorotational_instability
Protein family
van Breugel PC, Strubin M, Zheng N (January 2010). "A promiscuous alpha-helical motif anchors viral hijackers and substrate receptors to the CUL4-DDB1
HBx
Limbs of cephalopod molluscs
towards the keel's edge. The keels presumably streamline and improve the hydrodynamic characteristics of cephalopod arms, though this property has not been
Cephalopod_limb
same time. He also made important contributions to the theories of the hydrodynamics of turbulent flows, the atomic nucleus, ferromagnetism, cosmic rays
20th_century_in_science
also be used to perform various logical operations, in addition to the hydrodynamic force and the surface tension force. The magnetic field strength, type
Droplet-based_microfluidics
Cellular appendage functioning as locomotive or sensory organelle
Other differences among these three types are: Bacterial flagella are helical filaments, each with a rotary motor at its base which can turn clockwise
Flagellum
and Francis Crick published a paper about the discovery of the double helical structure of the DNA molecule based on the discoveries made by Rosalind
History_of_molecular_biology
Water channel protein in cell membranes
permeability of the cell membrane. Aquaporins have six membrane-spanning α-helical domains with both carboxylic and amino terminals on the cytoplasmic side
Aquaporin
Theoretical framework in physics
theory List of quantum field theories Local quantum field theory Maximally helicity violating amplitudes Noncommutative quantum field theory Quantization of
Quantum_field_theory
Differential gearbox that limits the rotational speed difference of output shafts
differential. The viscous type is generally simpler because it relies on hydrodynamic friction from fluids with high viscosity. Silicone-based oils are often
Limited-slip_differential
Protein pathway in cells
Heterotetramers (likely two of each) in the presence of lipid membranes. Hydrodynamic analysis of ESCRT-0 inside cells confirmed that it primarily exists as
ESCRT
Ability of bacteria to move independently using metabolic energy
PMC 4598630. PMID 26403719. Review of the hydrodynamics of bacterial swimming: Lauga, Eric (2016). "Bacterial Hydrodynamics". Annual Review of Fluid Mechanics
Bacterial_motility
significant amount of area ahead of the rorational axis, which moves the hydrodynamic centre of the rudder nearer to the rotation axis and reduces the torque
Glossary of nautical terms (A–L)
Glossary_of_nautical_terms_(A–L)
Russian-British scientist (1952–2025)
found many applications in the construction of physically consistent hydrodynamics as a part of Hilbert's sixth problem, modeling non-equilibrium flows
Alexander_Gorban
Class of German diesel-hydraulic locomotives
load-bearing frame, which rests on the two welded steel bogies, supported by helical springs, the engine is centrally located, with the fuel, batteries, oil
DB_Class_V_160
Fluid flow revolving around an axis of rotation
can end in the fluid, rather than at the boundary of the fluid. In the hydrodynamic interpretation of the behaviour of electromagnetic fields, the acceleration
Vortex
Degree to which disturbing a plasma system at equilibrium will destabilize it
as MHD. Plasma instabilities can be divided into two general groups: hydrodynamic instabilities kinetic instabilities. Plasma instabilities are also categorized
Plasma_stability
Motion system of a type of eukaryotic organism
observed movement sequences includes planar undulatory waves and traveling helical waves, either from the base to the tip, or in the opposite direction. Flagella
Protist_locomotion
Microscopic object able to traverse fluid
microswimmers experiencing hydrodynamic interactions with walls and obstacles are far-less understood. Furthermore, hydrodynamic interactions in suspensions
Microswimmer
Medical device to assist or replace a heart
approved for use in the EU, use either magnetic levitation ("maglev") or hydrodynamic suspension. The first left ventricular assist device (LVAD) system was
Ventricular_assist_device
Jean-Jacques Moreau, mathematician and mechanician. He discovered the helicity invariant in fluid dynamics. Jacqueline Ferrand, mathematician, who mainly
List_of_Occitans
Protein without a fixed 3D structure
detected by methods that are sensitive to molecular size, density or hydrodynamic drag, such as size exclusion chromatography, analytical ultracentrifugation
Intrinsically disordered proteins
Intrinsically_disordered_proteins
Nanostructures of protein-polymer conjugates
chain of the hydrophilic polyethylene glycol (PEG) can increase the hydrodynamic radius of the protein conjugate by 5-10 fold. Attachment to PEG was mainly
Polymer-protein_hybrid
Mechanical process
process used to separate two miscible substances, but also to analyze the hydrodynamic properties of macromolecules. It is one of the most important and commonly
Centrifugation
Any life form too small for the naked human eye to see that lives in a marine environment
PMID 7684268. Lauga, Eric; Thomas R Powers (25 August 2009). "The hydrodynamics of swimming microorganisms". Reports on Progress in Physics. 72 (9)
Marine_microorganisms
Type of turbine
thinner sections than standard carbon steel; reduced mass enhances the hydrodynamic flow conditions and efficiency of the water turbine. The SS(13Cr-4Ni)
Water_turbine
triumphed in 1953 when James Watson and Francis Crick deduced the double helical structure of DNA by constructing models constrained by and informed by
History_of_chemistry
Portable apparatus to recycle breathing gas
should not be unnecessarily long, which will cause additional weight, hydrodynamic drag, risk snagging on things, or contain excess dead space in a pendulum
Rebreather
Display that uses the light-modulating properties of liquid crystals
perpendicular to each other, and so the molecules arrange themselves in a helical structure, or twist. This induces the rotation of the polarization of the
Liquid-crystal_display
Comparison of a wide range of lengths
Estimates for Betelgeuse through Combined Evolutionary, Asteroseismic, and Hydrodynamic Simulations with MESA". The Astrophysical Journal. 902 (1): 63. arXiv:2006
Orders_of_magnitude_(length)
American solar physicist (1927–2022)
solar wind was, per Parker just "four lines of algebra". When he wrote hydrodynamic equations for an isothermal, extended coronal atmosphere, the plasma
Eugene_Parker
Genus of algae investigated for biofuel production
space requirements, cleaning, low efficiency, low gas transfer, and hydrodynamic stress. Several other problems also occur, including growth of the algae
Nannochloropsis_and_biofuels
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HYDRODYNAMICAL HELICITY