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NX™ Flow
es el módulo de análisis de fluidos (CFD) integrado en el entorno NX
Advanced Simulation. Ofrece herramientas sofisticadas de análisis de
fluidos y transferencia de calor de piezas y ensamblajes complejos. NX Flow
permite realizar de forma rápida y exacta simulaciones de análisis de fluidos
para conocer el comportamiento del producto en la fase de diseño y desarrollo
de producto solution para reducir costes y acelerar el lanzamiento del producto
al mercado al reducir el número de prototipos y ensayos físicos. NX Flow se
aplica en un amplio rango de industrias, incluyendo: espacio y defensa,
automoción, productos de consumo, componentes electrónicos de alta
tecnología, medicina, procesos y generación de potencia.
Aplicaciones de NX Flow
 NX
Flow solves
practical engineering challenges such as:
 | Computing:
 | Fluid
pressure and velocity fields within and around complex geometries (both
internal and external fluid flow simulations). |
| Investigating:
| Start-up,
shut-down or system failure transient performance degradation
conditions.
| Forced
and natural convection cooling schemes.
| Spacing
requirements between parts. |
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| Optimizing:
| Placement
of critical components.
| Size
and shape of heat sinks.
| Position
and sizing of fans, inlets, vents, and outlets. |
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| Determinining:
| Size
of wing profiles or critical car component shapes.
| Drag,
lift, or other forces and pressures acting on complex surfaces.
| Head
loss across a system or subsytem.
| Operating
point of a cooling fan. |
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| Designing:
| Air
and thermal comfort systems (HVAC cabin design).
| The
best fluid pipe pattern throughout a complex hydraulic system assembly. |
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In
essence, NX Flow allows engineers to solve very complex systems
numerically. It describes and predicts the flow of air, gases, or other fluids
and liquids around or through any engineering product assembly. Analyzing the
flow patterns and pressure regulation of fluid within an automative transmission
cooling system or the flow of air within an HVAC system for cabin thermal
comfort are two typical examples of NX Flow applications.
NX Flow
can be used in tandem with the NX
Thermal
product for seamless modeling of explicitly coupled forced and natural
convection problems, including radiation heat transfer.
NX
Flow solver capabilities:
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FE-based finite volume CFD scheme
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Navier-Stokes equations for both steady state and
transient flow
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Internal or external flows
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Turbulent, laminar and mixed flows
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Multiple 1st and 2nd order advection with or without
flux limiters
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Efficient time stepping and other algorithms for fast
transient calculations
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Unstructured fluid meshes (supports any combination of
tetrahedral, brick, pyramid, and wedge elements: linear and parabolic
types)
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Fluid buoyancy terms
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Automatic connection between disjoint fluid meshes
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CFD intermediate results recovery allowing solver
restart
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Forced, natural and mixed convections
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Multiple fluids in separate enclosures
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NX
Flow modeling capabilities:
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Automatic skin mesh (boundary layer mesh) with
unlimited layer options
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Complete set of automatic and/or manual meshing options
for the selected fluid domains
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Heat loads and temperature restraints on the fluid
domain
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Multiple enclosure definitions
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Embedded 2D/3D flow blockages
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Losses in fluid flow due to screens, filters and other
fluid obstructions
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Porous media modeling (including orthotropic porous
blockages)
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Head loss inlets and openings (fixed or proportional to
calculated velocity or squared velocity)
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Fluid swirl and turbulence criteria at inlet and
internal fans
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Fluid recirculation loop with head loss or heat
input/loss or fluid temperature change between unconnected fluid regions
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Nonlinear flow boundary conditions
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Altitude effects
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Nonlinear fluid properties
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Coupling
with NX Thermal and NX Advanced Thermal:
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Conduction, convection and radiation conjugate heat
transfer solver
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Nonlinear thermal contacts
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Thermal couplings (welded, bolted, bonded, or thermal
contact connections) for assembly modeling
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Disjoint thermal/fluid meshes support in assembly
modeling
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Surface-to-surface, edge-to-surface radiative heat
transfer
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Thermal solution customization (user subroutine)
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Hemicube-based view factor calculation (using graphics'
card hardware)
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Thermal model substructuring for radiation heat
transfer view factor calculations
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Radiation in participating media
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Radiation enclosures
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Radiative sources
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Diurnal solar environmental heating (including cloud,
altitude, longitude and latitude, and pollution effects)
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Specular and transmissive surfaces
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Optical radiative ray tracing
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Forced and natural convection correlations
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Hydraulic fluid networks
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Joule heating
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Phase change and thermal ablation
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Heater and thermostat modeling
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Peltier cooler modeling
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Open architecture solution customization (user
subroutines)
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Results
post-processing options:
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Fluid velocity (arrow plots and/or streamlines)
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Pressure
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Fluid density
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Mass flux
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Temperature
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Total thermal load/flux
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Convective heat flux
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Convective coefficient
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Volume/mass flow rate
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Shear stress
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Pressure on solid faces
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Fluid shear forces (viscous forces) on solid faces
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Drag/lift acting on objects
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Conductive heat flux
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View factor sums
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Radiative heat flux
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Aplicaciones de NX Flow
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