elements.catalog.fanno_pipe

elements.catalog.fanno_pipe(
    length,
    diameter,
    friction_factor,
    n_segments,
    name='pipe',
)

Distributed (Fanno) pipe: an n_segments chain of :func:pipe atoms.

A long or fast pipe is Fanno flow – wall friction drives the subsonic flow toward M = 1, so density, velocity and Mach vary continuously along the length and a single lumped K misses it. This chains n_segments pipe atoms, each of length L/N and the same diameter/friction_factor, joined by single internal edges (each internal edge is the intermediate flow state – no junctions). As N grows the chain converges to the true Fanno solution and can approach choke at the pipe exit; the locally-uniform per-segment mean state also propagates acoustics through the mean gradient far better than one lumped duct stamp.

Parameters

Name	Type	Description	Default
length	float	Total length L [m], hydraulic diameter D [m] and Darcy friction factor f (see :func:pipe).	required
diameter	float	Total length L [m], hydraulic diameter D [m] and Darcy friction factor f (see :func:pipe).	required
friction_factor	float	Total length L [m], hydraulic diameter D [m] and Darcy friction factor f (see :func:pipe).	required
n_segments	int	Number of pipe-atom segments N (>= 1; a fidelity knob, see :func:segments_for_frequency and :func:grid_refine).	required
name	str	Display name.	'pipe'

Returns

Name	Type	Description
	CompositeElementSpec