Fluid Flow & Transport

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Abstractions about fluid motion, mixing, momentum and mass transport, and their experimental or computational analysis. They include vortices, boundary and free-surface effects, pipe losses, turbulence models, particle tracking, compressible flow, and flow-control methods.

27 abstractions in this family — domain-specific abstractions that sit near one another in structural-signature space (k-means over structural-signature embeddings). Each is shown with its short description.

• Acoustic streaming — A steady fluid flow generated when attenuation or boundary dissipation converts oscillatory acoustic momentum into a time-averaged body force or stress.
• Chaotic mixing — Fluid mixing produced by repeated stretching and folding of material elements, generating exponentially fine filaments even in deterministic flows.
• Darcy (unit) — A non-SI unit of intrinsic permeability defined through Darcy’s law, equal to approximately 9.869233 times ten to the minus thirteen square metres.
• Electro-pneumatic control — Couple electrical decision logic and sensing to pneumatic power through electrically actuated valves, so low-power signals sequence or regulate air-driven actuators.
• Explicit algebraic stress model — A turbulence closure that expresses Reynolds-stress anisotropy explicitly as an algebraic tensor function of local mean strain, rotation, and turbulence scales.
• Immersed boundary method — A fluid–structure interaction method coupling an Eulerian fluid grid to a moving Lagrangian structure through distributed force and velocity interpolation.
• Inertance — Quantify the pressure difference required to accelerate volume flow in a fluid element, functioning as the inertial coefficient in lumped acoustic and fluid-network models.
• Isochron — Collect initial states that share one asymptotic phase or reduced long-term trajectory, forming a level set of the system's asymptotic-state map across transient directions.
• Kaye effect — A non-Newtonian fluid phenomenon in which a descending stream forms a temporary leaping jet from a mound of the same shear-thinning liquid.
• Kármán vortex street — An alternating periodic array of counter-rotating vortices shed downstream of a bluff body within a characteristic range of flow conditions.
• Landau–Levich problem — A thin-film fluid problem determining the coating deposited on a plate withdrawn slowly from a liquid bath through the balance of viscous, capillary and gravitational effects.
• Marangoni number — A dimensionless ratio comparing surface-tension-gradient-driven transport with diffusion of the quantity producing that gradient.
• Mass injection flow — A steady one-dimensional duct-flow model in which mass addition changes velocity, pressure, and Mach number while area and stagnation temperature remain fixed under ideal adiabatic assumptions.
• Material derivative — The rate of change of a field observed while following a material particle moving through a continuum, equal to local time change plus advective transport.
• Minor losses in pipe flow — Model localized irreversible mechanical-energy losses caused by fittings, valves, entrances, exits, bends, and area changes as a dimensionless coefficient multiplying a declared velocity head, while separating them from length-distributed wall-friction loss.
• Particle tracking velocimetry — A Lagrangian flow-measurement method that detects and links individual tracer-particle images across time to reconstruct trajectories and estimate velocity fields.
• Potential density — The density a fluid parcel would have after adiabatic displacement to a specified reference pressure without mixing or net heat exchange.
• Pressure-correction method — A class of numerical schemes coupling pressure and velocity in incompressible-flow computation by iteratively correcting a provisional velocity field.
• Seeding (fluid dynamics) — Introduce observable tracer particles into a flow so their motion can represent local fluid motion for visualization or velocity measurement, subject to fidelity and optical-bias constraints.
• Spinning drop method — An interfacial-tension measurement method that infers very low tension from the equilibrium elongation of a lighter drop in a denser liquid rotating in a horizontal capillary.
• Standard step method — A stepwise hydraulic calculation of gradually varied steady open-channel water-surface profiles using energy balance between surveyed cross sections.
• Starting vortex — The shed vortex formed near an airfoil’s trailing edge as circulation builds during acceleration from rest.
• Stefan adhesion — The viscous normal force resisting separation or approach of parallel surfaces with a thin Newtonian fluid layer between them.
• Supersonic speed — A flow or motion regime in which speed relative to a medium exceeds that medium’s local speed of sound.
• Taylor–Culick flow — An idealized axisymmetric flow in a long closed-end cylinder with uniform injection through a porous sidewall and axial discharge toward the open end.
• Ventricle (heart) — A muscular lower cardiac chamber that receives blood from an atrium and ejects it into the pulmonary or systemic arterial circulation through pressure-generating contraction.
• Von Kármán constant — The dimensionless proportionality constant in the logarithmic mean-velocity law for turbulent wall-bounded flow.