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Scientific visualization

SciVis (scientific visualization) is the visual side of simulation results: velocity fields, streamlines, isosurfaces, particle trajectories and animations. This page collects short clips from LS-STAG and LS-STAG-3D simulations. Each clip is muted and loops; the poster frame is shown until you press play. Click a clip to play it.

3D cases

3D wake past a circular cylinder at Re = 200. Velocity field behind the cylinder on a Cartesian cut-cell grid. The cylinder is represented by a level-set function. (unpublished)
3D wake past a circular cylinder at Re = 100. Lower-Reynolds-number cut-cell wake; the clip loops through the developed vortex street. (unpublished)
Autorotating propeller in a uniform stream. The blades autorotate under the flow; the clip shows the three-dimensional velocity field while the background mesh stays fixed. (unpublished)
Autorotating Darrieus rotor. Three straight blades autorotate through a uniform stream; the clip shows the 3D velocity field in the cut-cell domain. (unpublished)
Autorotating Savonius rotor. Velocity field behind a drag-driven autorotating rotor; the first frame shows the flow before the wake is fully established. (unpublished)
Autorotating plate. A thin plate autorotates in a uniform stream; the clip shows the velocity field and the vortex pair shed from the plate edges. (unpublished)
Rotationally oscillating body. Forced angular motion produces a compact wake in the three-dimensional domain. (unpublished)
Horizontally oscillating body. Forced horizontal motion produces alternating vortices and a pronounced three-dimensional wake. (unpublished)
Vertical oscillation with frequency Se, Se/St = 0.8. The smaller oscillation frequency produces a narrower wake than the 1.1 case. (unpublished)
Vertical oscillation with frequency Se, Se/St = 1.1. The larger frequency produces a wider and more energetic wake. (unpublished)
3D wake behind two side-by-side circular cylinders. Two stationary cylinders are placed side by side across the stream; the clip shows the velocity field in the wake. (unpublished)

2D cases

Flow-induced vibrations of two tandem cylinders at Re = 100. Two cylinders, each with one degree of freedom, in tandem; the clip starts from rest at t = 0 and shows the onset of resonance. Paper (PDF)
Flow-induced vibrations of two tandem cylinders at Re = 100 (from t = 85). The same two-cylinder case; the clip shows the resonance growth starting from t = 85. Paper (PDF)
Flow-induced vibrations of two tandem cylinders at Re = 1000. Two cylinders, each with one degree of freedom, in tandem; the higher Reynolds number produces a chaotic, wide wake. Paper (PDF)
Autorotating plate, 2D. Velocity field around a plate in the two-dimensional LS-STAG solver. Rotor paper
Autorotating Darrieus rotor, 2D. Velocity field around three straight blades. Rotor paper
Autorotating propeller, 2D. Velocity field around the autorotating blades. Rotor paper
Autorotating Savonius rotor, 2D. Velocity field around the curved blades. Rotor paper
Flow past a circular cylinder at Re = 3900. Velocity field of the turbulent wake. Method paper
Forced vertical oscillations with frequency Se (Se/St = 1.2). The cylinder oscillates vertically according to a prescribed law; the clip shows the velocity field.

Method

All clips come from the LS-STAG family. The solver uses a Cartesian cut-cell mesh and a level-set representation of the immersed boundary; moving bodies are handled without remeshing. The 3D cases use the 3D extension (LS-STAG-3D), while the 2D cases use the two-dimensional solver. Colours show the velocity field unless noted; the scales are qualitative and kept from the simulation output.

  • Publications — papers behind the methods and cases.
  • Software — LS-STAG-3D, cfd-vv-suite and registered software.
  • Conferences — talks and public recordings.