Last modified: Thu Oct 20 16:50:09 JST 2005
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- Mach stem calculated by parallel adaptive mesh refinement [NEW]
Density distribution (1.6MB)
Node distribution (1.1MB)
Test calculations reproducing the mach stem.
The calculation is performed by
a three-dimensional, block-structured, parallel adaptive mesh
refinement (AMR) code.
Each block consists of 4x4x2 cubic cells.
Peano-Hilbert space filling curve is adopted in order to partition data
into the nodes for each grid level separately
(see the movie of node distribution).
- Outflow formation in a collapsing cloud core
3D view (45MB)
Collapse of a magnetized molecular cloud core and
formation of a first core, a circumstellar disk and an outflow. The calculation is
performed by a three-dimensional MHD nested grid code.
The color iso-surfaces denote the iso-density surfaces.
The tubes denote the magnetic field lines.
The white iso-surfaces denote the iso-velocity surfaces, which
represent an outflow.
See this paper for detail.
- Several types of Binary formation
Binary formation calculated by a three-dimensional nested grid code.
The movies shows the cross-sections in the mid-plane (upper panel) and
meridian-plane (lower panel).
The color and arrows denote the density and velocity.
Note that the frame is magnified according to collapse of the cloud.
See this paper for detail.
4D2U project of
NAOJ created a more impressible movie
by using this simulation data.
Download a zip file at
- Sequential formation and merger of dense clumps in the first core
3D view (2.6MB)
The color isosurfaces denote the density in logarithmic scale.
Dense reagions, clumps, are seen in red.
The clumps are formed in a rotating disk and falls into the
central object, young protostar. The green region corresponds
to the first core. In this simulation, the first core is disk
2D view (11MB)
Same as the above movie but presented in cross section.
The color also denotes the density in logarithmic scale.
Thc clumps are seen in yellow-white color.
- Fragmentation of the elongated first core calculated by nested gird
In grid level 11 (1.1MB)
Fragmentation in the center of the cloud. Red isosurfaces denote
fragments. This movie shows
only small region of whole computation domain. The
calculation is done width the nested grid having grids of levels
1-12. This movie shows the area of the level 11.
In grid level 12 (1.1MB)
Same as the above movies but shows the area of level 12, the
finest grid. This movie shows the twice smaller region than the
- Test runs for nested grid codes
HD code (7.1MB)
This movie shows test runs for our hydrodynamical nested gird code.
A recipe of the test has shock tube problems, propagation of
shock waves in the several directions, propagation of small
perturbation, and etc.
See Those pages for
details (in Japananese).
MHD shock tube problem in view of 1D (0.4MB)
The upper and lower dots denote the density and velocity
distributions, respectively. Note that the computation is fully
three dimensional. This movie shows the values in a line which
is parallel to the
propagation direction of the shock wave. The dots in red,
green, blue dots denote the values in the grid level one, two, and
MHD shock tube problem in view of 2D (1.4MB)
The same as above movie but shown in cross section. The gray
scale, arrows, red curves denote the density distribution,
velocity, and magnetic field lines.
- Bar and disk formation in collapsing isotheraml clouds
bar formation through a rotating disk (1.6MB)
See this paper.
non-rotationg disk formation (1.5MB)
vertical bar formation (1.3MB)