Package toxi.sim.fluids

Class FluidSolver2D

java.lang.Object
toxi.sim.fluids.FluidSolver2D
public class FluidSolver2D extends Object
Optimized Jos Stam style fluid solver with vorticity confinement and buoyancy force.
Author:
Alexander McKenzie, Karsten Schmidt

optimized by toxi 2006-02-09

  • reduced nesting level of loops
  • removed need for I() util method by unrolling all index calculations
  • renamed variables for better legibility

  • Constructor Details

    • FluidSolver2D

      public FluidSolver2D(int w, int h, float timeStep)
      Creates a new instance of the given dimension uses the specified time step.
      Parameters:
      w - matrix width
      h - matrix height
      timeStep -

  • Method Details

    • decay

      public final void decay(float decay)

    • densitySolver

      public void densitySolver()
      The basic density solving routine.

    • getBuoyancyA

      public float getBuoyancyA()
      Returns:
      the buoyancyA

    • getBuoyancyB

      public float getBuoyancyB()
      Returns:
      the buoyancyB

    • getCurl

      public float[] getCurl()
      Returns:
      the curl

    • getDensityField

      public float[] getDensityField()
      Returns:
      the d

    • getDiffusion

      public float getDiffusion()
      Returns:
      the diffusion

    • getNumIterations

      public int getNumIterations()
      Returns:
      the numIterations

    • getTimeStep

      public float getTimeStep()
      Returns:
      the timeStep

    • getTotalHeight

      public int getTotalHeight()
      Returns:
      the totalHeight

    • getTotalWidth

      public int getTotalWidth()
      Returns:
      the totalWidth

    • getVelocityFieldU

      public float[] getVelocityFieldU()
      Returns:
      the u

    • getVelocityFieldV

      public float[] getVelocityFieldV()
      Returns:
      the v

    • getViscosity

      public float getViscosity()
      Returns:
      the viscosity

    • reset

      public void reset()
      Reset the datastructures. We use 1d arrays for speed.

    • setBuoyancyA

      public void setBuoyancyA(float buoyancyA)
      Parameters:
      buoyancyA - the buoyancyA to set

    • setBuoyancyB

      public void setBuoyancyB(float buoyancyB)
      Parameters:
      buoyancyB - the buoyancyB to set

    • setCurl

      public void setCurl(float[] curl)
      Parameters:
      curl - the curl to set

    • setDiffusion

      public void setDiffusion(float diffusion)
      Parameters:
      diffusion - the diffusion to set

    • setNumIterations

      public void setNumIterations(int numIterations)
      Parameters:
      numIterations - the numIterations to set

    • setTimeStep

      public void setTimeStep(float timeStep)
      Parameters:
      timeStep - the timeStep to set

    • setViscosity

      public void setViscosity(float viscosity)
      Parameters:
      viscosity - the viscosity to set

    • velocitySolver

      public void velocitySolver()
      The basic velocity solving routine as described by Stam.

    • vorticityConfinement

      public void vorticityConfinement(float[] Fvc_x, float[] Fvc_y)
      Calculate the vorticity confinement force for each cell in the fluid grid. At a point (i,j), Fvc = N x width where width is the curl at (i,j) and N = del |width| / |del |width||. N is the vector pointing to the vortex center, hence we add force perpendicular to N.
      Parameters:
      Fvc_x - The array to store the x component of the vorticity confinement force for each cell.
      Fvc_y - The array to store the y component of the vorticity confinement force for each cell.