balanced_force_cost Namespace Reference

Functions
	sphere_c (sub=4)
	build (cls, on, u0, kappa=None)
	run (cls, on, u0, steps, kappa=None)
	main ()

Variables
	N
	R
	SIGMA
	MU
	RATIO
	U0
	STEPS
	WARM
	REPEATS

Detailed Description

Cost of the balanced-force projection (doc/collocated_varrho_forces.md §4.8, gate G7) -- an
INSTRUMENT, not a gate. Two cases: MOVING (below) and STATIC (the same drop at rest, 50 steps:
with the increment solve and its full-RHS stop, WO-P5, a static interface must cost 0
pre-projection iterations after the first step).

A moving ratio-1000 drop on 32^3 (periodic, R = 8, sigma = 1, mu = 0.1, a uniform translation
U = 0.02 seeded in the velocity, dt = 0.5 capillary_dt), on both grids, stepped with the
balanced-force projection OFF and ON. Reports the median wall time per step over steps
[WARM, STEPS) and the mean pressure / balanced-force iteration counts. G7: ON <= 1.5x OFF, and
mean balanced-force iterations <= mean main pressure iterations.

The staggered grid runs with enable_vof_momentum (ratio 1000 with motion); the collocated grid is
V8 (the option is its default; OFF is set explicitly).

Run: OMP_NUM_THREADS=8 OMP_PROC_BIND=false PYTHONPATH=<build> python tests/study/balanced_force_cost.py
Timings on a shared host are noisy: OFF and ON are interleaved per repeat and the median taken.

Function Documentation

sphere_c()

balanced_force_cost.sphere_c

(

sub = 4

)

Definition at line 30 of file balanced_force_cost.py.

Referenced by build().

build()

balanced_force_cost.build	(		cls,
			on,
			u0,
			kappa = None
	)

Definition at line 43 of file balanced_force_cost.py.

References sphere_c().

run()

balanced_force_cost.run	(		cls,
			on,
			u0,
			steps,
			kappa = None
	)

Definition at line 65 of file balanced_force_cost.py.

Referenced by main().

main()

balanced_force_cost.main

(

)

Definition at line 82 of file balanced_force_cost.py.

References main(), and run().

Referenced by main().

Variable Documentation

N

balanced_force_cost.N

Definition at line 26 of file balanced_force_cost.py.

R

balanced_force_cost.R

Definition at line 26 of file balanced_force_cost.py.

SIGMA

balanced_force_cost.SIGMA

Definition at line 26 of file balanced_force_cost.py.

MU

balanced_force_cost.MU

Definition at line 26 of file balanced_force_cost.py.

RATIO

balanced_force_cost.RATIO

Definition at line 26 of file balanced_force_cost.py.

U0

balanced_force_cost.U0

Definition at line 26 of file balanced_force_cost.py.

STEPS

balanced_force_cost.STEPS

Definition at line 27 of file balanced_force_cost.py.

WARM

balanced_force_cost.WARM

Definition at line 27 of file balanced_force_cost.py.

REPEATS

balanced_force_cost.REPEATS

Definition at line 27 of file balanced_force_cost.py.