RYUON

is a Particle Simulation Suite ^†

RYUON| documents| stokes| libstokes libiter| twobody|| Book
News| What?| download| Links| History

The book behind twobody

The Smooth Dance of Two Spheres: An Exact Calculation in Fluid Mechanics follows this classical problem from Stokes flow to working C code, exact coefficient tables, and the human story behind the research.

Explore the book

What's new?

• Aug 19, 2026: The Smooth Dance of Two Spheres: An Exact Calculation in Fluid Mechanics published in Kindle and paperback editions.
• Apr 15, 2018: twobody-the code is available at https://github.com/kichiki/twobody
• News @ SF
• Oct 23, 2006: stokes-0.4 released
• Oct 22, 2006: libstokes-0.4 released
• Oct 12, 2006:
  • manual added!
  • stokes-0.3, libstokes-0.3, and libiter-0.3 released
• Oct 5, 2006: libstokes-0.2 and libiter-0.2 released
• Oct 3, 2006: add stokes web page.

What is RYUON?

RYUON is a Particle Simulation Suite.

My scientific interest is on "particles in a fluid" or between "discrete and continuous systems". RYU of RYU-ON has meanings of "grain" and "flow" in Japanese and it well fits my interest, the GAP between the two.

I am planning to release the following codes and data:

• Simulators
  • [stokes]Stokesian dynamics: massless particles in a viscous fluid
  • Fluidized Beds Simulator: heavy particles in a viscous fluid
    • Ichiki & Hayakawa, Phys. Rev. E 52,(1995) 658-670
    • Ichiki & Hayakawa, Phys. Rev. E 57,(1998) 1990-1996
• Libraries
  • [libstokes]library for Stokesian dynamics
    • Brady & Bossis, Annu.Rev.Fluid Mech. 1988, Vol.20 pp.111-157,
      Durlofsky & Brady, J.Fluid Mech. 1987, Vol.180 p.21,
      Brady, Phillips, Lester, & Bossis, J.Fluid Mech. 1988, Vol.195 pp.257-280.
    • Ichiki, J.Fluid Mech. 452 (2002) pp. 231-262.
  • [libiter]library of iterative solvers for the linear set of equations
    • Ichiki & Brady, Phys. Fluids 2001, Vol.13 pp.350-353
• Data and Details
  • [twobody] The exact solutions for two-body problems in Stokes flows
    • Jeffrey & Onishi, J.Fluid Mech. 1984, Vol.139 pp.261-290,
      Jeffrey, Phys. Fluids A 1992, Vol.4, pp.16-29,
      Jeffrey, Morris, Brady, Phys. Fluids A 1993, Vol.5, pp.2317-2325.
• Utilities: Analysis and Visualization
  • Molecular dynamics: utility for existing OpenSource Projects such as GROMACS and TINKER
    • Ichiki & Consta, J. Phys. Chem. B (2006) 110 pp.19168-19175
• Future Plans
  • Solver for General Many-Body Problems: including electrostatics, gravitational systems, elastisity, vortex dynamics, etc
  • FEM, BEM layer using the above.

Download

please visit File Releases @ SF.

Links

• Project Page @ SF
• about myself:
  • official web site
  • blog
  • WaoN, another Open Source Project
• Brady' group @ caltech, father of the Stokesian dynamics method
• This project owes the following Open Source Projects:
  • SourceForge.Net, the host
  • Scientific: BLAS, ATLAS, NetCDF, Octave
  • Visualization: POVRAY, VTK, OpenGL
  • Others: SWIG, guile

History

• Aug 19, 2026: The Smooth Dance of Two Spheres: An Exact Calculation in Fluid Mechanics published in Kindle and paperback editions.
• Sep 27, 2006
  • 1) libiter and libstokes are up at CVS!
  • 2) libiter-0.1 and libstokes-0.1 are released!
• Sep 26, 2006 : libstokes and libiter web pages are up. CVS will be ready soon.
• Sep 24, 2006 : twobody web page (in preliminary version) is added.
• Sep 22, 2006 : start this page.

Footnotes

• ryuon.pov: main source for POV-Ray
• ryuon.inc: RYUON logo object
• High resolution images: 640x480, 1024x768