cs567.smoke
Class Constants

java.lang.Object
  cs567.smoke.Constants

public class Constants
extends java.lang.Object

Compile-time constants/parameters affecting the simulation. Although not great software design, I've collected them here to avoid students/you scanning the codebase looking for all the hidden tweakable parameters.

Field Summary

static float	BUOYANCY Smoke buoyancy (dimensionless) (default: 1)
static float	dt Time-step size.
static int	n Resolution of (n+2)-by-(n+2) computational grid.
static int	N Resolution of N-by-N computational grid.
static int	N_GAUSS_SEIDEL_ITERATIONS Iterations used in FluidSolver.linearSolver().
static int	size Number of cells in computational domain, and size of grid-based float[] arrays indexed by I(i,j).
static float	SMOKE_DIFFUSION Smoke diffusion coefficient (default: 0.0001).
static float	V_d Drag force amplitude, V_d (default: 0.5)
static float	V_f Driving force amplitude, V_f (default: 2)
static float	V_g Gathering rate amplitude, V_g (default: 0.0005)
static float	VISCOSITY Viscosity (velocity diffusion coefficient).

Constructor Summary

Constants()

Method Summary

static int

I(int i, int j) Array index function.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

dt

public static final float dt

Time-step size. Note that explicitly integrated smoke-control forcing/density terms can impose step-size restrictions.

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Constant Field Values

N

public static final int N

Resolution of N-by-N computational grid.

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Constant Field Values

n

public static final int n

Resolution of (n+2)-by-(n+2) computational grid.

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Constant Field Values

size

public static final int size

Number of cells in computational domain, and size of grid-based float[] arrays indexed by I(i,j).

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Constant Field Values

N_GAUSS_SEIDEL_ITERATIONS

public static final int N_GAUSS_SEIDEL_ITERATIONS

Iterations used in FluidSolver.linearSolver().

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Constant Field Values

V_f

public static final float V_f

Driving force amplitude, V_f (default: 2)

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V_g

public static final float V_g

Gathering rate amplitude, V_g (default: 0.0005)

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Constant Field Values

V_d

public static final float V_d

Drag force amplitude, V_d (default: 0.5)

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Constant Field Values

SMOKE_DIFFUSION

public static final float SMOKE_DIFFUSION

Smoke diffusion coefficient (default: 0.0001). Nonzero values are needed (I believe) to avoid instabilities during smoke control.

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Constant Field Values

VISCOSITY

public static final float VISCOSITY

Viscosity (velocity diffusion coefficient). Default is zero since we try hard to get rid of numerical diffusion (e.g., using vorticity confinement) without adding more, and incurring additional linear system solves.

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Constant Field Values

BUOYANCY

public static final float BUOYANCY

Smoke buoyancy (dimensionless) (default: 1)

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Constant Field Values

Constructor Detail

Constants

public Constants()

Method Detail

I

public static final int I(int i,
                          int j)

Array index function.