ns::NSSolver Class Reference

#include <ns_solver.hpp>

Public Member Functions
	NSSolver (idx N_, real dt_, real nu_=0.0)
void	init_shear_layer (real rho=0.05, real delta=0.05)
void	step ()
	Advance one time step (advect -> pressure -> project).
real	vorticity (idx i, idx j) const
	Vorticity omega = d_v/d_x - d_u/d_y at grid corner (i*h, j*h).
real	speed (idx i, idx j) const
	Velocity magnitude averaged to cell centre (i,j).
real	interp_u (real px, real py) const
	Interpolate x-velocity at physical point (px, py).
real	interp_v (real px, real py) const
	Interpolate y-velocity at physical point (px, py).

Public Attributes
const idx	N
const real	h
const real	dt
const real	nu
num::Vector	u
num::Vector	v
num::Vector	p
	velocity faces + cell-centre pressure, N*N each
Stats	stats

Detailed Description

Definition at line 40 of file ns_solver.hpp.

Constructor & Destructor Documentation

NSSolver()

ns::NSSolver::NSSolver	(	idx	N_,
		real	dt_,
		real	nu_ = 0.0
	)

Parameters

N_	Grid resolution (NxN cells)
dt_	Time step
nu_	Kinematic viscosity (0 = inviscid Euler)

Definition at line 15 of file ns_solver.cpp.

Member Function Documentation

init_shear_layer()

void ns::NSSolver::init_shear_layer	(	real	rho = 0.05,
		real	delta = 0.05
	)

Double shear layer initial condition (Kelvin-Helmholtz instability). Two counter-flowing bands at y~=0.25 and y~=0.75 seed vortex roll-up.

Parameters

rho	Shear layer thickness (default 0.05)
delta	Perturbation amplitude (default 0.05)

Definition at line 27 of file ns_solver.cpp.

References h, N, p, u, and v.

Referenced by main().

interp_u()

real ns::NSSolver::interp_u	(	real	px,
		real	py
	)		const

Interpolate x-velocity at physical point (px, py).

Definition at line 254 of file ns_solver.cpp.

References h, N, and u.

interp_v()

real ns::NSSolver::interp_v	(	real	px,
		real	py
	)		const

Interpolate y-velocity at physical point (px, py).

Definition at line 271 of file ns_solver.cpp.

References h, N, and v.

speed()

real ns::NSSolver::speed	(	idx	i,
		idx	j
	)		const

Velocity magnitude averaged to cell centre (i,j).

Definition at line 298 of file ns_solver.cpp.

References u, and v.

step()

void ns::NSSolver::step

(

)

Advance one time step (advect -> pressure -> project).

Definition at line 50 of file ns_solver.cpp.

References nu, stats, and ns::Stats::total_ms.

Referenced by main().

vorticity()

real ns::NSSolver::vorticity	(	idx	i,
		idx	j
	)		const

Vorticity omega = d_v/d_x - d_u/d_y at grid corner (i*h, j*h).

Definition at line 289 of file ns_solver.cpp.

References h, u, and v.

Referenced by main().

Member Data Documentation

dt

const real ns::NSSolver::dt

Definition at line 69 of file ns_solver.hpp.

h

const real ns::NSSolver::h

Definition at line 69 of file ns_solver.hpp.

Referenced by init_shear_layer(), interp_u(), interp_v(), and vorticity().

N

const idx ns::NSSolver::N

Definition at line 68 of file ns_solver.hpp.

Referenced by init_shear_layer(), interp_u(), and interp_v().

nu

const real ns::NSSolver::nu

Definition at line 69 of file ns_solver.hpp.

Referenced by step().

p

num::Vector ns::NSSolver::p

velocity faces + cell-centre pressure, N*N each

Definition at line 72 of file ns_solver.hpp.

Referenced by init_shear_layer().

stats

Stats ns::NSSolver::stats

Definition at line 74 of file ns_solver.hpp.

Referenced by main(), and step().

u

num::Vector ns::NSSolver::u

Definition at line 72 of file ns_solver.hpp.

Referenced by init_shear_layer(), interp_u(), speed(), and vorticity().

v

num::Vector ns::NSSolver::v

Definition at line 72 of file ns_solver.hpp.

Referenced by init_shear_layer(), interp_v(), speed(), and vorticity().

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

• /home/runner/work/numerics/numerics/apps/ns_demo/ns_solver.hpp
• /home/runner/work/numerics/numerics/apps/ns_demo/ns_solver.cpp