41.  Electromagnetism; electron and ion optics

41.20.-q   Applied classical electromagnetism

41.20.Cv   Electrostatics; Poisson and Laplace equations, boundary-value problems 

41.20.Gz   Magnetostatics; magnetic shielding, magnetic induction, boundary-value 
                  problems 

41.20.Jb   Electromagnetic wave propagation; radiowave propagation (for light 
                 propagation, see 42.25.Bs; for electromagnetic waves in plasma, 
                see 52.35.Hr; for ionospheric and magnetospheric propagation, 
                see 94.20.Bb and 94.30.Tt)

41.50.+h   X-ray beams and x-ray optics (see also 07.85.Fv in instruments)

41.60.-m   Radiation by moving charges

41.60.Ap   Synchrotron radiation (for synchrotron radiation instrumentation, 
                  see 07.85.Qe)

41.60.Bq   Cherenkov radiation 

41.60.Cr   Free-electron lasers (see also 52.59.Rz Free-electron devices—in plasma physics)

41.75.-i   Charged-particle beams

41.75.Ak   Positive-ion beams 

41.75.Cn   Negative-ion beams 

41.75.Fr   Electron and positron beams 

41.75.Ht   Relativistic electron and positron beams 

41.75.Jv    Laser-driven acceleration (see also 52.38.-r Laser-plasma interactions)

41.75.Lx   Other advanced accelerator concepts 

41.85.-p    Beam optics (see also 07.77 Atomic, molecular, and charged particle 
                 sources and detectors; 29.27 Beams in particle accelerators)

41.85.Ar   Beam extraction, beam injection 

41.85.Ct   Beam shaping, beam splitting 

41.85.Ew   Beam profile, beam intensity 

41.85.Gy   Chromatic and geometrical aberrations 

41.85.Ja   Beam transport 

41.85.Lc   Beam focusing and bending magnets, wiggler magnets, and quadrupoles 
                 (see also 07.55.Db—in instruments; for superconducting magnets, 
                  see 85.25.Ly)

41.85.Ne   Electrostatic lenses, septa 

41.85.Qg   Beam analyzers, beam monitors, and Faraday cups 

41.85.Si   Beam collimators, monochromators 

41.90.+e   Other topics in electromagnetism; electron and ion optics 
                 (restricted to new topics in section 41)

42.   Optics (for optical properties of gases, see 51.70; for optical properties 
         of bulk materials and thin films, see 78.20; for x-ray optics, see 41.50)

42.15.-i     Geometrical optics

42.15.Dp   Wave fronts and ray tracing 

42.15.Eq   Optical system design 

42.15.Fr   Aberrations 

42.25.-p   Wave optics

42.25.Bs   Wave propagation, transmission and absorption (see also 41.20.Jb—in
                       electromagnetism; for propagation in atmosphere, see 42.68.Ay; 
                       see also 52.40.Db, 52.38.-r—in plasma physics)

42.25.Dd    Wave propagation in random media 

42.25.Fx   Diffraction and scattering 

42.25.Gy   Edge and boundary effects; reflection and refraction 

42.25.Hz   Interference 

42.25.Ja   Polarization 

42.25.Kb   Coherence 

42.25.Lc   Birefringence 

42.30.-d   Imaging and optical processing

42.30.Kq   Fourier optics 

42.30.Lr   Modulation and optical transfer functions 

42.30.Ms   Speckle and moire patterns 

42.30.Rx   Phase retrieval 

42.30.Sy   Pattern recognition 

42.30.Tz   Computer vision; robotic vision 

42.30.Va   Image forming and processing 

42.30.Wb   Image reconstruction; tomography 

42.40.-i   Holography

42.40.Eq   Holographic optical elements; holographic gratings 

42.40.Ht   Hologram recording and read-out methods (see also 42.70.Ln Holographic 
                 recording materials; optical storage media)

42.40.Jv   Computer-generated holograms 

42.40.Kw   Holographic interferometry; other holographic techniques (see also
                   07.60.Ly Interferometers)

42.40.Lx   Diffraction efficiency, resolution, and other hologram characteristics 

42.40.My   Applications 

42.40.Pa   Volume holograms 

42.50.-p   Quantum optics (for lasers, see 42.55 and 42.60; see also 42.65 
                Nonlinear optics; 03.65 Quantum mechanics)

42.50.Ar   Photon statistics and coherence theory 

42.50.Ct   Quantum description of interaction of light and matter; related experiments 

42.50.Dv   Nonclassical field states; squeezed, antibunched, and sub-Poissonian states; 
                 operational definitions of the phase of the field; phasemeasurements 

42.50.Fx   Cooperative phenomena; superradiance and superfluorescence 

42.50.Gy   Effects of atomic coherence on propagation, absorption, and amplification 
                of light 

42.50.Hz   Strong-field excitation of optical transitions in quantum systems; 
                 multi-photon processes; dynamic Stark shift (for multiphoton 
                 ionization and excitation of atoms and molecules, see 32.80.Rn, 
                 and 33.80.Rm, respectively)

42.50.Lc   Quantum fluctuations, quantum noise, and quantum jumps 

42.50.Md   Optical transient phenomena: quantum beats, photon echo, free-induction 
                  decay, dephasings and revivals, optical nutation, and self-induced transparency 

... ... ...     Dynamics of nonlinear optical systems; optical instabilities, optical chaos, 
                and optical spatio–temporal dynamics, see 42.65.Sf

... ... ...     Optical solitons; nonlinear guided waves, see 42.65.Tg

42.50.Vk   Mechanical effects of light on atoms, molecules, electrons, and ions 
                 (see also 32.80.Pj and 33.80.Ps Optical cooling and trapping of atoms
                  and molecules, respectively)

 ... ... ...   Optical tests of fundamental laws and forces, see 12.20.F Experimental 
                  tests in quantum electrodynamics and  03.65.Ta Foundations of 
                  quantum mechanics; measurement theory

42.55.-f   Lasers

42.55.Ah   General laser theory 

42.55.Ks   Chemical lasers (for chemiluminescence, see 78.60.Ps)

42.55.Lt   Gas lasers including excimer and metal-vapor lasers 

42.55.Mv   Dye lasers 

42.55.Px   Semiconductor lasers; laser diodes 

42.55.Rz   Doped-insulator lasers and other solid state lasers 

42.55.Sa   Microcavity and microdisk lasers 

42.55.Vc   X- and gamma-ray lasers 

42.55.Wd   Fiber lasers 

42.55.Xi   Diode-pumped lasers 

42.55.Ye   Raman lasers (see also 42.65.Dr Stimulated Raman scattering; CARS)

... ... ...     Free-electron lasers, see 41.60.Cr

42.60.-v   Laser optical systems: design and operation

42.60.By   Design of specific laser systems 

42.60.Da   Resonators, cavities, amplifiers, arrays, and rings 

42.60.Fc   Modulation, tuning, and mode locking 

42.60.Gd    Q-switching 

42.60.Jf   Beam characteristics: profile, intensity, and power; spatial pattern formation 

42.60.Lh   Efficiency, stability, gain, and other operational parameters 

42.60.Mi   Dynamical laser instabilities; noisy laser behavior 

42.60.Pk   Continuous operation 

42.60.Rn   Relaxation oscillations and long pulse operation 

... ... ...     Ultrashort pulse generation, see 42.65.Tg

... ... ...     Dynamics of nonlinear optical systems, see 42.65.Sf

42.62.-b   Laser applications

42.62.Be   Biological and medical applications (see also 87.50.Hj, 87.54.Fj, 87.53.Ly,
                  and 87.80.Cc in biological and medical physics)

42.62.Cf   Industrial applications 

42.62.Eh   Metrological applications (see also 06.20 Metrology, and 06.30 
                Measurements common to several branches of physics and astronomy)

42.62.Fi   Laser spectroscopy 

42.65.-k   Nonlinear optics

42.65.An   Optical susceptibility, hyperpolarizability (see also 33.15.Kr Electric
                  and magnetic moments (and derivatives), polarizability, and magnetic  
                  susceptibility)

42.65.Dr   Stimulated Raman scattering; CARS 

42.65.Es   Stimulated Brillouin and Rayleigh scattering 

42.65.Hw   Phase conjugation, optical mixing, and photorefractive effect 

42.65.Jx   Beam trapping, self-focusing, and thermal blooming 

42.65.Ky   Harmonic generation, frequency conversion (see also 42.79.Nv Optical 
                  frequency converters)

42.65.Pc   Optical bistability, multistability, and switching (see also 42.60.Gd 
                 Q-switching; 42.79.Ta Optical computers, logic elements,
                  interconnects, switches; neural networks)

42.65.Re   Ultrafast processes; optical pulse generation and pulse compression 

42.65.Sf   Dynamics of nonlinear optical systems; optical instabilities, optical chaos 
                 and complexity, and optical spatio–temporal dynamics 

42.65.Tg   Optical solitons; nonlinear guided waves (for solitons in fibers,
                  see 42.81.Dp)

42.65.Wi   Nonlinear waveguides 

42.65.Yj   Optical parametric oscillators and amplifiers 

42.66.-p   Physiological optics

42.66.Ct   Anatomy and optics of eye 

42.66.Ew   Physiology of eye; optic-nerve structure and function 

42.66.Lc   Vision: light detection, adaptation, and discrimination 

42.66.Ne   Color vision: color detection, adaptation, and discrimination 

42.66.Qg   Scales for light and color detection 

42.66.Si   Psychophysics of vision, visual perception; binocular vision 

42.68.-w   Atmospheric optics

42.68.Ay   Propagation, transmission, attenuation, and radiative transfer (see 
                 also 92.60.Ta Interaction of atmosphere with electromagnetic 
                 waves; propagation)

42.68.Bz   Atmospheric turbulence effects (see also 92.60.Ek Convection,
                 turbulence, and diffusion)

42.68.Ca   Spectral absorption by atmospheric gases (see also 94.10.Gb Absorption
                  and scattering of radiation)

42.68.Ge   Effects of clouds and water (see also 92.60.Jq Water in the 
                  atmosphere; 92.60.Nv Cloud physics)

42.68.Jg   Effects of aerosols (see also 92.60.Mt Particles and aerosols)

42.68.Kh   Effects of air pollution (see also 92.60.Sz Air quality and air pollution)

42.68.Mj   Scattering, polarization (see also 94.10.Gb Absorption and scattering 
                  of radiation)

42.68.Sq   Image transmission and formation 

42.68.Wt   Remote sensing; LIDAR and adaptive systems 

42.70.-a   Optical materials (see also 81.05 specific materials: fabrication, 
                 treatment, testing and analysis)

42.70.Ce   Glasses, quartz 

42.70.Df   Liquid crystals (for structure of liquid crystals, see 61.30)

42.70.Gi   Light-sensitive materials 

42.70.Hj   Laser materials 

42.70.Jk   Polymers and organics 

42.70.Km   Infrared transmitting materials 

42.70.Ln   Holographic recording materials; optical storage media 

42.70.Mp   Nonlinear optical crystals (see also 77.84 Dielectric, piezoelectric, 
                   and ferroelectric materials)

42.70.Nq   Other nonlinear optical materials; photorefractive and semiconductor materials 

42.70.Qs   Photonic bandgap materials 

42.72.-g   Optical sources and standards (for lasers, see 42.55; see also 
                 07.57.Hm in instruments) 

42.72.Ai   Infrared sources 

42.72.Bj   Visible and ultraviolet sources 

42.79.-e   Optical elements, devices, and systems (for integrated optics, see 
                 42.82; for fiber optics, see 42.81) 

... ... ...     Optical instruments, equipment and techniques, see 07.60 and 07.57

... ... ...     Optical spectrometers, see 07.57.Ty and 07.60.Rd

... ... ...     Photography, photographic instruments and techniques, see 07.68

... ... ...     Magnetooptical devices, see 85.70.Sq

42.79.Ag   Apertures, collimators 

42.79.Bh   Lenses, prisms and mirrors 

42.79.Ci   Filters, zone plates, and polarizers 

42.79.Dj   Gratings (for holographic gratings, see 42.40.Eq) 

42.79.Ek   Solar collectors and concentrators (see also 84.60.Jt Photoelectric 
                  conversion: solar cells and arrays)

42.79.Fm   Reflectors, beam splitters, and deflectors 

42.79.Gn   Optical waveguides and couplers (for fiber waveguides and 
                 waveguides in integrated optics, see 42.81.Qb and 42.82.Et, respectively)

42.79.Hp   Optical processors, correlators, and modulators 

42.79.Jq   Acousto-optical devices (see also 43.38.Zp—in acoustics appendix)

42.79.Kr   Display devices, liquid-crystal devices (see also 85.60.Pg Display systems)

42.79.Ls   Scanners, image intensifiers, and image converters (see also 85.60 
                  Optoelectronic devices)

42.79.Mt   Schlieren devices 

42.79.Nv   Optical frequency converters 

42.79.Pw   Imaging detectors and sensors (see also 85.60.Gz Photodetectors)

42.79.Qx   Range finders, remote sensing devices; laser Doppler velocimeters, 
                  SAR, and LIDAR (see also 42.68.Wt  Remote sensing; LIDAR 
                  and adaptive systems)

42.79.Ry   Gradient-index (GRIN) devices (for fiber GRIN devices, see 42.81.Ht) 

42.79.Sz   Optical communication systems, multiplexers, and demultiplexers 

42.79.Ta   Optical computers, logic elements, interconnects, switches; neural networks 

42.79.Vb   Optical storage systems, optical disks (see also 42.40.Ht Hologram 
                  recording and readout methods)

42.79.Wc   Optical coatings 

42.81.-i   Fiber optics

... ... ...     Fiber-optic instruments, see 07.60.Vg

42.81.Bm   Fabrication, cladding, and splicing 

42.81.Cn   Fiber testing and measurement of fiber parameters 

42.81.Dp   Propagation, scattering, and losses; solitons 

42.81.Gs   Birefringence, polarization 

42.81.Ht   Gradient-index (GRIN) fiber devices 

42.81.Pa   Sensors, gyros 

42.81.Qb   Fiber waveguides, couplers, and arrays 

42.81.Wg   Other fiber-optical devices (for fiber lasers, see 42.55.Wd) 

42.82.-m   Integrated optics

42.82.Bq   Design and performance testing of integrated-optical systems 

42.82.Cr   Fabrication techniques; lithography, pattern transfer (see also 85.40 
                 Microelectronics: LSI, VLSI, ULSI; integrated circuit fabrication 
                 technology) 

42.82.Ds   Interconnects, including holographic interconnects (see also 42.79.Td 
                 Optical computers, logic elements, interconnects, switches; neural networks)

42.82.Et   Waveguides, couplers, and arrays (for fiber waveguides, see 42.81.Qb)

42.82.Fv   Hybrid systems 

42.82.Gw   Other integrated-optical elements and systems 

42.86.+b   Optical workshop techniques

42.87.-d   Optical testing techniques

42.87.Bg   Phase shifting interferometry (see also 07.60.Ly Interferometers)

42.88.+h   Radiation effects on optical elements, devices, and systems

42.90.+m   Other topics in optics (restricted to new topics in section 42)

43.   Acoustics (for more detailed headings, see Appendix to 43) 

43.20.+g   General linear acoustics

43.25.+y   Nonlinear acoustics

43.28.+h   Aeroacoustics and atmospheric sound (see also 92.60 Meteorology)

43.30.+m   Underwater sound (see also 92.10.Vr—in physics of oceans)

43.35.+d   Ultrasonics, quantum acoustics, and physical effects of sound

... ... ...     Phonons in crystal lattices, see 63.20

... ... ...     Acoustical properties of rocks and minerals, see 91.60.Lj

... ... ...     Sound waves in plasma, see 52.35.Dm

... ... ...     Low-temperature acoustics and sound in liquid helium, see 67

... ... ...     Acoustical properties of solids, see 62.65; for ultrasonic relaxation, see 62.80

... ... ...     Acoustic properties of thin films, see 68.60.Bs

... ... ...     Acoustoelectric effects, see 72.50 and 73.50.Rb

... ... ...     Magnetoacoustic effects, oscillations, and resonance, see 72.55,
                73.50.Rb, and 75.80

... ... ...     Acoustic holography, see 43.60; for acoustooptical effects, see 78.20.Hp

43.38.+n   Transduction; acoustical devices for the generation and reproduction 
                 of sound

43.40.+s   Structural acoustics and vibration

43.50.+y   Noise: its effects and control

43.55.+p   Architectural acoustics

43.58.+z   Acoustical measurements and instrumentation

43.60.+d   Acoustic signal processing

43.64.+r   Physiological acoustics

... ... ...     Biological effects of sound andultrasound, see 87.50.Kk

43.66.+y   Psychological acoustics

43.70.+i   Speech production

43.71.+m   Speech perception

43.72.+q   Speech processing and communication systems

43.75.+a   Music and musical instruments

43.80.+p   Bioacoustics

43.90.+v   Other topics in acoustics (restricted to new topics in section 43)

44.   Heat transfer

44.05.+e    Analytical and numerical techniques

44.10.+i   Heat conduction (see also 66.60 and 66.70 in transport properties 
                 of condensed matter)

44.15.+a    Channel and internal heat flow

44.20.+b    Boundary layer heat flow

44.25.+f   Natural convection (see also 47.27.Te Convection and heat transfer 
                 in fluid dynamics)

44.27.+g   Forced convection

44.30.+v  Heat flow in porous media

44.35.+c   Heat flow in multiphase systems

44.40.+a  Thermal radiation

44.90.+c   Other topics in heat transfer (restricted to new topics in section 44)

45.  Classical mechanics of discrete systems

45.05.+x  General theory of classical mechanics of discrete systems

45.10.-b    Computational methods in classical mechanics (see also 02.70 
                 Computational techniques in mathematical methods in physics)

45.10.Db    Variational and optimization methods 

45.10.Hj    Perturbation and fractional calculus methods 

45.10.Na   Geometrical and tensorial methods 

45.20.-d   Formalisms in classical mechanics

45.20.Dd   Newtonian mechanics 

45.20.Jj   Lagrangian and Hamiltonian mechanics 

45.30.+s   General linear dynamical systems (for nonlinear dynamical systems, 
                 see 05.45) 

45.40.-f   Dynamics and kinematics of rigid bodies

45.40.Cc   Rigid body and gyroscope motion 

45.40.Gj   Ballistics (projectiles; rockets) 

45.40.Ln   Robotics 

45.50.-j   Dynamics and kinematics of a particle and a system of particles

45.50.Dd   General motion 

45.50.Jf   Few- and many-body systems 

45.50.Pk   Celestial mechanics (see also 95.10.Ce in fundamental astronomy)

45.50.Tn   Collisions 

45.70.-n   Granular systems (see also 05.65 Self-organized systems)

45.70.Cc   Static sandpiles; granular compaction 

45.70.Ht   Avalanches 

45.70.Mg   Granular flow: mixing, segregation and stratification 

45.70.Qj   Pattern formation 

45.70.Vn   Granular models of complex systems; traffic flow 

45.80.+r   Control of mechanical systems (see also 46.80 Measurement 
                  methods and techniques in continuum mechanics of solids)

45.90.+t   Other topics in classical mechanics of discrete systems
                (restricted to new topics in section 45)

46.   Continuum mechanics of solids (see also 83.10.Ff in rheology)

46.05.+b   General theory of continuum mechanics of solids

46.15.-x   Computational methods in continuum mechanics(see also 02.70 
                 Computational techniques in mathematical methods in physics)

46.15.Cc   Variational and optimizational methods 

46.15.Ff    Perturbation and complex analysis metthods 

46.25.-y   Static elasticity

46.25.Cc   Theoretical studies 

46.25.Hf    Thermoelasticity and electromagnetic elasticity (electroelasticity, 
                  magnetoelasticity) 

46.32.+x   Static buckling and instability

46.35.+z   Viscoelasticity, plasticity, viscoplasticity (see 
                       also 83.60.Bc, Df,  in rheology)

46.40.-f   Vibrations and mechanical waves (see also 43.40 Structural acoustics 
                and vibration; 62.30 in mechanical properties of solids)

46.40.Cd   Mechanical wave propagation (including diffraction, scattering, 
                 and dispersion) 

46.40.Ff   Resonance, damping and dynamic stability 

46.40.Jj   Aeroelasticity and hydroelasticity 

46.50.+a   Fracture mechanics, fatigue and cracks (see also 62.20.Mk in 
                  mechanical properties of solids)

46.55.+d   Tribology and mechanical contacts (see also 81.40.Pq Friction, 
                  lubrication and wear in materials science; 62.20.Qp in mechanical 
                  properties of solids)

46.65.+g   Random phenomena and media (see also 05.40 in statistical 
                 physics, thermodynamics and nonlinear dynamical systems)

46.70.-p   Application of continuum mechanics to structures

46.70.De   Beams, plates and shells 

46.70.Hg   Membranes, rods and strings 

46.70.Lk   Other structures 

46.80.+j   Measurement methods and techniques in continuum mechanics 
                of solids (see also 07.10 Mechanical instruments, equipment, and 
                techniques)

46.90.+s   Other topics in continuum mechanics of solids (restricted to new 
                  topics in section 46)

47.   Fluid dynamics (for fluid dynamics of quantum fluids, see 67; see also 83
         Rheology; for sound generation by fluid flow, see 43.28.Ra in acoustics 
          appendix)

47.10.+g   General theory (see also 83.10—in rheology)

47.11.+j   Computational methods in fluid dynamics (see also 83.85.Pt 
            Computational fluid dynamics—in rheology; 02.70—in 
                mathematical methods in physics)

47.15.-x   Laminar flows

47.15.Cb   Laminar boundary layers 

47.15.Fe   Stability of laminar flows 

47.15.Gf   Low-Reynolds-number (creeping) flows 

47.15.Hg   Potential flows 

47.15.Ki   Inviscid flows with vorticity 

47.15.Pn   Laminar suspensions 

47.15.Rq   Laminar flows in cavities 

47.17.+e   Mechanical properties of fluids (see also 62.10 Mechanical properties
                  of liquids)

47.20.-k   Hydrodynamic stability

47.20.Bp   Buoyancy-driven instability 

47.20.Cq   Inviscid instability 

47.20.Dr   Surface-tension-driven instability 

47.20.Ft   Instability of shear flows 

47.20.Gv   Viscous instability 

47.20.Hw   Morphological instability; phase changes (see also 64 Equations of state, 
                   phase equilibria, and phase transitions)

47.20.Ky   Nonlinearity (including bifurcation theory) 

47.20.Lz   Secondary instability 

47.20.Ma   Interfacial instability 

47.20.Pc   Receptivity 

... ... ...     Chaotic phenomena, see 47.52 and 05.45

47.27.-i   Turbulent flows, convection, and heat transfer

47.27.Ak   Fundamentals 

47.27.Cn   Transition to turbulence 

47.27.Eq   Turbulence simulation and modeling 

47.27.Gs   Isotropic turbulence; homogeneous turbulence 

47.27.Jv   High-Reynolds-number turbulence 

47.27.Lx   Wall-bounded thin shear flows 

47.27.Nz   Boundary layer and shear turbulence 

47.27.Pa   Thick shear flows 

47.27.Qb   Turbulent diffusion 

47.27.Rc   Turbulence control 

47.27.Sd   Noise (turbulence generated) 

47.27.Te   Convection and heat transfer (see also 44.25 in heat transfer)

47.27.Vf   Wakes 

47.27.Wg   Jets 

47.32.-y   Rotational flow and vorticity

47.32.Cc   Vortex dynamics 

47.32.Ff   Separated flows 

47.35.+i   Hydrodynamic waves

47.37.+q   Hydrodynamic aspects of superfluidity (see also 67.40.Hf and 
                  67.57.De—in quantum fluids and solids)

47.40.-x   Compressible flows; shock and detonation phenomena (see 
                 also 28.70 Nuclear explosions, 52.35.Tc Shock waves and discontinuities 
                      in plasma, 83.60.Uv—in rheology, 43.25.Cb, 43.28.Mw and
                 43.40.Jc—in   acoustics appendix)

47.40.Dc   General subsonic flows 

47.40.Hg   Transonic flows 

47.40.Ki   Supersonic and hypersonic flows 

47.40.Nm   Shock-wave interactions and shock effects (for shock-wave initiated 
                   chemical reactions, see 82.40.Fp)

47.45.-n   Rarefied gas dynamics

47.45.Dt   Free molecular flows 

47.45.Gx   Slip flows 

47.45.Nd   Accommodation 

47.50.+d   Non-Newtonian fluid flows (see also 83.50 Deformation and
                               flow)

47.52.+j   Chaos (see also 05.45 Nonlinear dynamics and nonlinear dynamical
                       systems;   83.60.Wc Flow instabilities)

47.53.+n   Fractals

47.54.+r   Pattern selection; pattern formation

47.55.-t   Nonhomogeneous flows

47.55.Bx   Cavitation 

47.55.Dz   Drops and bubbles 

47.55.Hd   Stratified flows 

... ... ...      Rotational flows, see 47.32 

47.55.Kf   Multiphase and particle-laden flows 

47.55.Mh   Flows through porous media (for heat transfer in porous media, see 44.30)

47.60.+i   Flows in ducts, channels, nozzles, and conduits (see also 
                      83.50.Ha—in rheology)

... ... ...     Biological fluid dynamics, see 87.19.Tt

47.62.+q   Flow control

47.65.+a   Magnetohydrodynamics and electrohydrodynamics (for MHD in 
                 plasma, see 52.30.Cv)

47.70.-n   Reactive, radiative, or nonequilibrium flows

47.70.Fw   Chemically reactive flows (see also 83.80.Jx—in rheology)

47.70.Mc   Radiation gas dynamics 

47.70.Nd   Nonequilibrium gas dynamics 

47.75.+f   Relativistic fluid dynamics (for astrophysical aspects, see 95.30.Lz 
                 and 95.30.Qd)

47.80.+v   Instrumentation for fluid dynamics (see also 83.85—in rheology; 
                 07.30 Vacuum apparatus and techniques)

47.85.-g  Applied fluid mechanics

47.85.Dh   Hydrodynamics, hydraulics, hydrostatics 

47.85.Gj   Aerodynamics 

47.85.Kn   Hydraulic and pneumatic machinery 

47.85.Np   Fluidics 

47.90.+a   Other topics in fluid dynamics (restricted to new topics in section 47)