{ "model": { "rank": 3405, "code": "thing-q172145", "model_id": "vr.tr.fluid-mechanics", "name": "fluid mechanics", "purpose": "Let an agent explain fluid mechanics and its principles and subfields, describe its applications from engineering to oceanography, support calculations and learning, and describe methods such as experiment and computational fluid dynamics.", "family": "Thing Registry", "category": "Information and virtual systems", "status": "research-draft", "kind": "thing", "plane": "INF", "domain": "INF.KNW", "industry": "", "version": "", "url": "/models/thing/q172145/", "tier": 2, "score": 86, "payload": { "layer": "wikidata", "aliases": [ "ocean current", "South Equatorial Current", "ocean gyre", "counter-current", "cold sea current", "warm ocean current", "upwelling", "downwelling", "Equatorial Stream", "boundary current", "baroclinic current", "tidal race", "wind-driven current", "geostrophic current", "undertow", "North Equatorial Current", "rip current", "subsurface currents", "subpolar gyre", "swimming pool countercurrent", "Antilles-Guiana countercurrent", "coastal upwelling", "eastern boundary currents", "western boundary currents", "biological fluid mechanics", "Tait equation", "hydrostatics", "environmental fluid mechanics", "astrophysical fluid dynamics", "magnetohydrodynamics", "hydromechanics", "aeromechanics" ], "aliasCount": 32, "merged": 32, "knownIn": 86, "facets": null, "markers": [], "lexicalClass": "", "senseRank": null, "alsoRegisteredAs": null, "source": { "dataset": "wikidata", "item": "Q172145", "url": "https://www.wikidata.org/wiki/Q172145", "license": "CC0 1.0" } }, "research": { "vercy": "1.0-draft", "publication": { "status": "research-draft", "adjudicationStatus": "unreviewed", "publishableCanonical": false, "generatedAt": "2026-09-12T05:02:39Z", "providers": [ "Claude" ], "breadth": "written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify", "pass": 2, "wave": 2, "engine": "claude" }, "metaModel": { "id": "THING-Q172145", "registryId": "vr.tr.fluid-mechanics", "name": "fluid mechanics", "version": "0.2.0-wave.2", "entryKind": "thing", "family": "Thing Registry", "domain": [ "INF.KNW" ], "status": "research-draft" }, "canonicalUrl": "https://ver.cy/models/thing/q172145/", "model": { "registry_id": "vr.tr.fluid-mechanics", "name": "fluid mechanics", "purpose": "Let an agent explain fluid mechanics and its principles and subfields, describe its applications from engineering to oceanography, support calculations and learning, and describe methods such as experiment and computational fluid dynamics.", "definition": "The branch of physics and engineering that studies fluids, liquids and gases, at rest and in motion, comprising fluid statics, fluid dynamics and their applications, described by conservation laws and the Navier-Stokes equations and encompassing phenomena from pipe flow, aerodynamics and turbulence to ocean currents and gyres, atmospheric circulation and blood flow; fluid mechanics underpins hydraulic, aeronautical, chemical and environmental engineering and the geosciences.", "what_it_is_for": "Study of fluids at rest and in motion.", "affordances": [ "explain principles", "describe applications", "support calculations", "describe methods" ], "distinguishing_features": [ "Continuum description", "Conservation laws", "Turbulence", "Wide application" ], "appearance": "Not physical; a field of study.", "visual_identification": [ "Physics of liquids and gases", "Statics, dynamics, turbulence, applications", "Solid mechanics studies deformable solids; thermodynamics studies heat and energy" ], "physical_properties": [], "families_and_kinds": [ "fluid statics", "fluid dynamics", "aerodynamics and hydrodynamics", "geophysical fluid dynamics including ocean currents", "computational fluid dynamics" ], "related_models": [ { "relation": "is a kind of", "target": "continuum mechanics", "why": "category" }, { "relation": "is related to", "target": "mechanical stress", "why": "stress in fluids and solids" }, { "relation": "is related to", "target": "heat", "why": "convective heat transfer" }, { "relation": "is related to", "target": "aviation", "why": "aerodynamics in flight" } ], "identifiers": [], "standards_and_regulation": [ "SI units and notation", "Engineering design codes for hydraulics and aerodynamics", "No regulation of the science" ], "failure_modes_and_hazards": [ "Misapplied simplifications", "Numerical errors in simulation", "Confusing ocean currents as the field itself" ], "in_scope": [], "out_of_scope": [], "characteristics": [] }, "sources": [], "structure": { "bundles": [ { "id": "understand", "name": "Understand", "description": "What fluid mechanics is.", "rationale": "Physics.", "layers": [ { "id": "principles", "name": "Principles", "description": "Principles.", "findings": [ { "id": "principles-finding", "name": "Principles", "description": "Principles.", "questions": [ { "text": "What are the core principles of fluid mechanics, including continuity, momentum and energy conservation and the Navier-Stokes equations?", "kind": "definition" }, { "text": "Which subfield is meant?", "kind": "boundary" } ] } ] }, { "id": "phenomena", "name": "Phenomena", "description": "Key phenomena.", "findings": [ { "id": "phenomena-finding", "name": "Phenomena", "description": "Phenomena.", "questions": [ { "text": "What are viscosity, pressure, laminar and turbulent flow, and boundary layers?", "kind": "definition" }, { "text": "Which entry fits turbulence?", "kind": "action" } ] } ] } ] }, { "id": "apply", "name": "Apply", "description": "Applications and calculation.", "rationale": "Engineering.", "layers": [ { "id": "calculate", "name": "Calculate", "description": "Calculating flows.", "findings": [ { "id": "calculate-finding", "name": "Calculate", "description": "Calculation.", "questions": [ { "text": "How can flow rate, pressure drop or lift be estimated for this problem?", "kind": "action" }, { "text": "Which entry fits pipe flow?", "kind": "action" } ] } ] }, { "id": "fields", "name": "Fields", "description": "Application fields.", "findings": [ { "id": "fields-finding", "name": "Fields", "description": "Fields.", "questions": [ { "text": "How is fluid mechanics applied in hydraulics, aeronautics, chemical processing, medicine and environment?", "kind": "provenance" }, { "text": "Which entry fits a specific application?", "kind": "action" } ] } ] } ] }, { "id": "earth", "name": "Earth", "description": "Geophysical fluids.", "rationale": "Science.", "layers": [ { "id": "ocean", "name": "Ocean", "description": "Ocean currents.", "findings": [ { "id": "ocean-finding", "name": "Ocean", "description": "Ocean.", "questions": [ { "text": "How does fluid mechanics explain ocean currents, gyres and equatorial currents?", "kind": "provenance" }, { "text": "Which entry fits oceanography?", "kind": "action" } ] } ] }, { "id": "atmosphere", "name": "Atmosphere", "description": "Atmosphere.", "findings": [ { "id": "atmosphere-finding", "name": "Atmosphere", "description": "Atmosphere.", "questions": [ { "text": "How does fluid mechanics underpin weather and climate models?", "kind": "provenance" }, { "text": "Which entry fits meteorology?", "kind": "action" } ] } ] } ] }, { "id": "learn", "name": "Learn", "description": "Methods and teaching.", "rationale": "Education.", "layers": [ { "id": "methods", "name": "Methods", "description": "Experimental and computational methods.", "findings": [ { "id": "methods-finding", "name": "Methods", "description": "Methods.", "questions": [ { "text": "How are experiments, dimensional analysis and computational fluid dynamics used?", "kind": "provenance" }, { "text": "Which references are standard?", "kind": "provenance" } ] } ] }, { "id": "teach", "name": "Teach", "description": "Teaching.", "findings": [ { "id": "teach-finding", "name": "Teach", "description": "Teaching.", "questions": [ { "text": "How can fluid mechanics be taught with demonstrations?", "kind": "action" }, { "text": "Which misconceptions arise?", "kind": "provenance" } ] } ] } ] } ] }, "openQuestions": [ "Should fluid dynamics be a separate entry?", "How should textbooks be linked?", "How should simulation tools be linked?" ], "statistics": { "bundles": 4, "layers": 8, "findings": 8, "questions": 16 } }, "draft": { "generator": "vr.draft.v3", "status": "draft-generated", "researched": false, "archetype": "discipline or field of knowledge", "method": "Written from the archetype playbook - what this kind of thing needs beyond identity and provenance - and from the structure that recurred across 6,333 models already researched by two engines. Applied to this entry by rule. No source was read for this thing and no claim here is researched. This entry carries no facets of its own, so they were inferred from its domain - a guess about a whole domain applied to one thing.", "facetsInferred": true, "nextPass": "A researcher replaces this draft with a sourced specification. Treat every sentence below as a proposal to argue with.", "purpose": "Give an agent a durable, checkable way to recognise a fluid mechanics, record what state it is in, and decide what may be done with it.", "whatItIs": "Let an agent explain fluid mechanics and its principles and subfields, describe its applications from engineering to oceanography, support calculations and learning, and describe methods such as experiment and computational fluid dynamics.", "characteristics": { "substance": "information", "origin": "conceptual", "agency": "inert" }, "whatYouCanDoWithIt": [ "read and interpreted" ], "distinguishingFeatures": [ "Names folded into this entry, which a task may need to split apart again: ocean current, South Equatorial Current, ocean gyre, counter-current, cold sea current, warm ocean current, upwelling, downwelling, Equatorial Stream, boundary current, baroclinic current, tidal race.", "32 finer distinctions are held as aliases rather than separate entries, because telling them apart needs a task that asks for it.", "Described in 86 Wikipedia languages, which is a measure of how widely the thing is known, not of how important it is." ], "openQuestionsForResearch": [ "Which of the bundles below does a real task actually need, and which are ceremony?", "What does this thing have that the facets do not capture at all?", "Which neighbouring kind is most often confused with a fluid mechanics, and on what evidence are they told apart?" ], "whatItIsMadeOf": "content that has to be carried by something else", "physicalCharacter": [ "Does nothing on its own; everything it does, something else did to it.", "These come from the domain this entry sits in rather than from the entry itself, so treat them as a first guess about the whole domain applied to one thing." ], "whatCanBeDoneWithIt": [ "read it and act on what it says" ], "howItIsRecognised": [], "relatedModels": [ { "relation": "covers", "note": "Finer kinds folded into this entry because telling them apart needs a task that asks for it. Each is a model waiting to be split out when one does.", "targets": [ "ocean current", "South Equatorial Current", "ocean gyre", "counter-current", "cold sea current", "warm ocean current", "upwelling", "downwelling", "Equatorial Stream", "boundary current", "baroclinic current", "tidal race" ] } ], "standing": "Described in 86 Wikipedia languages, which measures how widely it is written about rather than how important or how common it is. 32 finer distinctions are held inside this entry as names rather than as separate models.", "structure": { "bundles": [ { "id": "identity-and-classification", "name": "Identity, naming and classification", "description": "How an agent tells one fluid mechanics from another, and a fluid mechanics from things that resemble it.", "rationale": "Recognition comes before every other claim. Without stable identity nothing else in the model can be trusted to be about the same thing twice.", "layers": [ { "id": "naming-and-identifiers", "name": "Names and identifiers", "description": "The names this thing goes by and the identifiers that survive translation and time.", "findings": [ { "id": "preferred-name-and-aliases", "name": "Preferred name, aliases and local names", "description": "Which name to use, which names mean the same thing, and which merely sound similar.", "questions": [ { "id": "preferred-name-and-aliases-q01", "text": "What identifies and describes the name of a fluid mechanics, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "preferred-name-and-aliases-q02", "text": "Who or what asserted this about the name of a fluid mechanics, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "preferred-name-and-aliases-q03", "text": "What may an agent decide or do once the name of a fluid mechanics is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] }, { "id": "stable-identifiers", "name": "Stable identifiers and external keys", "description": "Identifiers that keep pointing at this kind of thing across systems and languages.", "questions": [ { "id": "stable-identifiers-q01", "text": "What identifies and describes an identifier for a fluid mechanics, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "stable-identifiers-q02", "text": "Who or what asserted this about an identifier for a fluid mechanics, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "stable-identifiers-q03", "text": "What may an agent decide or do once an identifier for a fluid mechanics is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] }, { "id": "classification-and-granularity", "name": "Classification and granularity", "description": "Where a fluid mechanics sits among kinds, and how finely a task needs to cut it.", "findings": [ { "id": "kind-and-parents", "name": "Kind, parents and neighbouring kinds", "description": "The classes this thing belongs to and the ones it is next to.", "questions": [ { "id": "kind-and-parents-q01", "text": "What identifies and describes the kind of a fluid mechanics, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "kind-and-parents-q02", "text": "Who or what asserted this about the kind of a fluid mechanics, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "kind-and-parents-q03", "text": "What may an agent decide or do once the kind of a fluid mechanics is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] }, { "id": "distinguishing-features", "name": "Distinguishing features", "description": "What separates a fluid mechanics from the things most often confused with it.", "questions": [ { "id": "distinguishing-features-q01", "text": "What identifies and describes what distinguishes a fluid mechanics, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "distinguishing-features-q02", "text": "Who or what asserted this about what distinguishes a fluid mechanics, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "distinguishing-features-q03", "text": "What may an agent decide or do once what distinguishes a fluid mechanics is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] } ] }, { "id": "state-and-lifecycle", "name": "State and lifecycle", "description": "The states a fluid mechanics passes through and the events that move it between them.", "rationale": "Most decisions about a thing depend on what state it is in now, which is a claim with a time on it, not a property.", "layers": [ { "id": "lifecycle-stages", "name": "Lifecycle stages", "description": "From coming into existence to ceasing to be one of these.", "findings": [ { "id": "stages-and-transitions", "name": "Stages and transitions", "description": "The stages worth naming and what moves a fluid mechanics between them.", "questions": [ { "id": "stages-and-transitions-q01", "text": "What identifies and describes the lifecycle of a fluid mechanics, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "stages-and-transitions-q02", "text": "Who or what asserted this about the lifecycle of a fluid mechanics, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "stages-and-transitions-q03", "text": "What may an agent decide or do once the lifecycle of a fluid mechanics is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] }, { "id": "observations-and-status", "name": "Observations and current status", "description": "What is observed about a fluid mechanics, how often and by whom.", "findings": [ { "id": "observation-record", "name": "Observation record", "description": "How an observation of a fluid mechanics is recorded so that it can be superseded rather than overwritten.", "questions": [ { "id": "observation-record-q01", "text": "What identifies and describes an observation of a fluid mechanics, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "observation-record-q02", "text": "Who or what asserted this about an observation of a fluid mechanics, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "observation-record-q03", "text": "What may an agent decide or do once an observation of a fluid mechanics is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] } ] }, { "id": "content-and-access", "name": "Content, encoding and access", "description": "What a fluid mechanics says, how it is encoded and who may read it.", "rationale": "An informational thing carries content that can be copied, versioned and withheld, none of which its physical carrier explains.", "layers": [ { "id": "content-and-encoding", "name": "Content and encoding", "description": "The content itself, its format and its language.", "findings": [ { "id": "content-and-format", "name": "Content, format and language", "description": "What a fluid mechanics contains and in what form it is held.", "questions": [ { "id": "content-and-format-q01", "text": "What identifies and describes the content of a fluid mechanics, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "content-and-format-q02", "text": "Who or what asserted this about the content of a fluid mechanics, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "content-and-format-q03", "text": "What may an agent decide or do once the content of a fluid mechanics is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] }, { "id": "access-and-rights", "name": "Access, rights and retention", "description": "Who may read, copy or change it, and for how long it is kept.", "findings": [ { "id": "access-rules", "name": "Access rules and retention", "description": "The permissions attached to a fluid mechanics and the period it survives.", "questions": [ { "id": "access-rules-q01", "text": "What identifies and describes access to a fluid mechanics, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "access-rules-q02", "text": "Who or what asserted this about access to a fluid mechanics, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "access-rules-q03", "text": "What may an agent decide or do once access to a fluid mechanics is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] } ] }, { "id": "subject-and-method", "name": "Subject matter and method", "description": "What fluid mechanics studies and how it establishes anything.", "rationale": "A field is identified by its questions and its methods, and those are what distinguish it from the fields next to it.", "layers": [ { "id": "subject", "name": "Subject matter", "description": "The questions it takes as its own.", "findings": [ { "id": "subject-record", "name": "Questions and objects of study", "description": "What it is about, stated so a neighbouring field can be told apart.", "questions": [ { "id": "subject-record-q01", "text": "What questions and objects does fluid mechanics take as its own?", "kind": "definition" }, { "id": "subject-record-q02", "text": "Which questions does it share with a neighbouring field, and who claims them?", "kind": "boundary" } ] } ] }, { "id": "method", "name": "Method and evidence", "description": "How claims are established and what counts as evidence.", "findings": [ { "id": "method-record", "name": "Methods and standards of evidence", "description": "The methods used and what they are taken to establish.", "questions": [ { "id": "method-record-q01", "text": "By what methods does fluid mechanics establish claims, and what counts as sufficient evidence?", "kind": "provenance" }, { "id": "method-record-q02", "text": "What kind of claim can this field not settle, and where should an agent look instead?", "kind": "action" } ] } ] } ] }, { "id": "institutions-and-classification", "name": "Institutions and classification", "description": "Where fluid mechanics is practised and how catalogues place it.", "rationale": "The institutional footprint is the evidence that a field exists as a field rather than as a topic.", "layers": [ { "id": "institutions", "name": "Institutional markers", "description": "Societies, journals, degrees and departments.", "findings": [ { "id": "institution-record", "name": "Bodies and venues", "description": "Where the field organises itself.", "questions": [ { "id": "institution-record-q01", "text": "Which societies, journals or degrees mark fluid mechanics as an established field?", "kind": "provenance" }, { "id": "institution-record-q02", "text": "What would show that it is emerging or dissolving rather than established?", "kind": "boundary" } ] } ] }, { "id": "classification", "name": "Classification schemes", "description": "Where library and research classifications put it.", "findings": [ { "id": "classification-record", "name": "Codes and their disagreements", "description": "The classification codes that place it, and where they differ.", "questions": [ { "id": "classification-record-q01", "text": "Which classification schemes place fluid mechanics, under what codes?", "kind": "definition" }, { "id": "classification-record-q02", "text": "Where do those schemes disagree about its scope?", "kind": "boundary" } ] } ] } ] }, { "id": "provenance-and-evidence", "name": "Provenance, evidence and time", "description": "Where every claim about a fluid mechanics came from and when it held.", "rationale": "A claim without a source and a time cannot be superseded, only overwritten, and an agent that overwrites loses the ability to explain itself.", "layers": [ { "id": "source-and-authority", "name": "Source and authority", "description": "Who said it, on what evidence, and how strongly.", "findings": [ { "id": "claim-provenance", "name": "Claim provenance and confidence", "description": "The authority behind each claim about a fluid mechanics and how confident it is.", "questions": [ { "id": "claim-provenance-q01", "text": "What identifies and describes a claim about a fluid mechanics, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "claim-provenance-q02", "text": "Who or what asserted this about a claim about a fluid mechanics, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "claim-provenance-q03", "text": "What may an agent decide or do once a claim about a fluid mechanics is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] }, { "id": "time-and-versions", "name": "Time, versions and supersession", "description": "When a claim was true, when it was learnt, and what replaced it.", "findings": [ { "id": "validity-and-supersession", "name": "Validity period and supersession", "description": "How an old claim about a fluid mechanics is retired without being erased.", "questions": [ { "id": "validity-and-supersession-q01", "text": "What identifies and describes the validity of a claim about a fluid mechanics, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "validity-and-supersession-q02", "text": "Who or what asserted this about the validity of a claim about a fluid mechanics, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "validity-and-supersession-q03", "text": "What may an agent decide or do once the validity of a claim about a fluid mechanics is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] } ] } ] }, "statistics": { "bundles": 6, "layers": 12, "findings": 14, "questions": 38 } } } }