moving_step_bench Namespace Reference

Functions
	make_scene (cen, R)
	build (N, moving, V)
	bench (N, nstep=12)
	march (N=48, nstep=40)

Variables
	KN_R
	KI_I
	KI_R
int	what = sys.argv[1] if len(sys.argv) > 1 else "all"

Detailed Description

Layer 3 rung 4: the MOVING-STEP DRIVER -- cost, and a march that actually moves.

Two things, both measured rather than modelled:

  1. COST. ms/step for a static step vs a moving step (step + rebuild_geometry), at 64^3 and
     128^3. v1 rebuilds the whole geometry every step by design: the Layer-3 input measurement is
     that a 128^3 rebuild is ~65% momentum/IBM stencils and ~35% pressure/MG with scene sampling in
     the noise, so an incremental path has to attack BOTH sides and is deferred.

  2. THAT IT MARCHES. A sphere translating through initially quiescent fluid: the body displaces by
     the distance its velocity implies, the fluid it drags acquires momentum in the direction of
     travel, and the projection keeps max|div| at solver level throughout -- i.e. the rebuild
     preserves the flow field instead of resetting it (set_solid zeroes u/phi/P by design).

Function Documentation

make_scene()

moving_step_bench.make_scene	(		cen,
			R
	)

Definition at line 24 of file moving_step_bench.py.

Referenced by build(), and march().

build()

moving_step_bench.build	(		N,
			moving,
			V
	)

Definition at line 38 of file moving_step_bench.py.

References make_scene().

bench()

moving_step_bench.bench	(		N,
			nstep = 12
	)

Definition at line 64 of file moving_step_bench.py.

march()

moving_step_bench.march	(		N = 48,
			nstep = 40
	)

A translating sphere in quiescent fluid: it must move, drag fluid, and stay divergence free.

Definition at line 90 of file moving_step_bench.py.

References make_scene(), and mean().

Variable Documentation

KN_R

moving_step_bench.KN_R

Definition at line 21 of file moving_step_bench.py.

KI_I

moving_step_bench.KI_I

Definition at line 21 of file moving_step_bench.py.

KI_R

moving_step_bench.KI_R

Definition at line 21 of file moving_step_bench.py.

what

int moving_step_bench.what = sys.argv[1] if len(sys.argv) > 1 else "all"

Definition at line 138 of file moving_step_bench.py.