feedtwin.comps.elements.Bend Class Reference

Inheritance diagram for feedtwin.comps.elements.Bend:

Collaboration diagram for feedtwin.comps.elements.Bend:

Public Member Functions
float	pressure_drop (self, float mdot, FlowConditions flow)
dict[str, float]	diagnostics (self, float mdot, FlowConditions flow)
list[Violation]	check (self)
Public Member Functions inherited from feedtwin.comps.base.HydraulicComponent
None	__init__ (self, ComponentInstance instance)
str	id (self)
str	type (self)
float	static_head (self, FlowConditions flow)
float	total_dp (self, float mdot, FlowConditions flow)
float	signal (self, FlowConditions flow, str name, float default=1.0)
bool	isolates (self, Mapping[str, float]|None signals=None)
float|None	flow_ceiling (self, FlowConditions flow)
float|None	pinned_flow (self, float dp_available, FlowConditions flow)
bool	is_choked (self, float dp_available, FlowConditions flow)
int	n_residuals (self)
Sequence[float]	residuals (self, EvalContext ctx)
Mapping[str, float]	outputs (self, EvalContext ctx)
FlowConditions	conditions (self, PortState port, Mapping[str, float] signals)
str	__repr__ (self)

Protected Member Functions
float	_K (self, float mdot, FlowConditions flow)

Additional Inherited Members
Public Attributes inherited from feedtwin.comps.base.HydraulicComponent
	instance = instance
	p = instance.si_params()
	opt = dict(instance.options)
Static Public Attributes inherited from feedtwin.comps.base.HydraulicComponent
str	inlet_port = "inlet"
str	outlet_port = "outlet"
bool	symmetric = False
	conditions_provider = None

Detailed Description

A bend in hardline, resisted according to how tight it actually is.

``fluids.bend_rounded`` takes the real centreline radius rather than a
nominal elbow class, which matters: the resistance of a bend is a strong
function of r/D, and a tube bent on whatever former was to hand is not a
long-radius elbow. Between r/D = 1 and r/D = 5 the loss changes severalfold.

The curvature's effect on friction is inside that correlation already, so
this deliberately does *not* add a curved-friction term on top -- that would
count the same physics twice. :class:`FlexHose` is the case where curved
friction is added, because there the whole run is bent rather than a
discrete arc of it.

Minimum bend radius is checked but never enforced. See :meth:`check`.

Definition at line 250 of file elements.py.

Member Function Documentation

_K()

float feedtwin.comps.elements.Bend._K ( self, float mdot, FlowConditions flow )

protected

Definition at line 269 of file elements.py.

References p, and feedtwin.comps.base.HydraulicComponent.p.

Referenced by diagnostics(), and pressure_drop().

check()

list[Violation] feedtwin.comps.elements.Bend.check

(

self

)

Is this bend tighter than the tube allows?

Reported, not raised: a line bent too tight is buildable, and the model
should still solve so the cost is visible. Quoted against OD where one
is given, because that is how tube benders and hose datasheets state it.

Reimplemented from feedtwin.comps.base.HydraulicComponent.

Definition at line 300 of file elements.py.

References _USBD_HandleTypeDef.id, anonymous_namespace{config_broadcast_service_main.cpp}::BoardInfo.id, anonymous_namespace{idle_e2e.cpp}::Check.id, backend.routers.layerx.Job.id, check_t.id, detail::exception.id, engine.layerx.sources.Drawing.id, feedtwin.comps.base.HydraulicComponent.id(), feedtwin.comps.elements.OrificeISO5167.id, feedtwin.comps.gas.GasOrifice.id, feedtwin.comps.manifold.Manifold.id, feedtwin.comps.regulator.Regulator.id, feedtwin.comps.relief.ReliefValve.id, feedtwin.engine.component.InjectorLeg.id, feedtwin.session.core.Session.id, feedtwin.session.hookup.Knob.id, fsw::config::StateDef.id, p, and feedtwin.comps.base.HydraulicComponent.p.

diagnostics()

dict[str, float] feedtwin.comps.elements.Bend.diagnostics	(		self,
		float	mdot,
		FlowConditions	flow )

Derived quantities worth reporting: velocity, Reynolds number, K.

Never consumed by a solver. This is what a frame and a report show, and
what makes a result inspectable rather than just a number.

Reimplemented from feedtwin.comps.base.HydraulicComponent.

Definition at line 291 of file elements.py.

References _K(), feedtwin.comps.elements.Fitting._K(), p, and feedtwin.comps.base.HydraulicComponent.p.

pressure_drop()

float feedtwin.comps.elements.Bend.pressure_drop	(		self,
		float	mdot,
		FlowConditions	flow )

Flow-dependent pressure loss [Pa]. Always non-negative.

A *loss*: it opposes the flow, so it lowers the downstream pressure
whichever way the fluid is going. Reverse flow is each component's own
business -- symmetric for a pipe, very much not for a check valve.

Anything that does **not** depend on the direction of flow belongs in
:meth:`static_head`, not here. See that method for why the distinction
is load-bearing rather than tidy.

Reimplemented from feedtwin.comps.base.HydraulicComponent.

Definition at line 282 of file elements.py.

References feedtwin.comps.elements._dynamic_head(), _K(), feedtwin.comps.elements.Fitting._K(), p, and feedtwin.comps.base.HydraulicComponent.p.

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The documentation for this class was generated from the following file:

• lib/feedtwin/feedtwin/comps/elements.py