Visualization of nonsteady flow simulations based on adaptive meshes

Visualization of unsteady 3D flow simulations based on adaptive meshes is demanding. We are very grateful to Dr. Jean Favre from the Swiss National Supercomputing Centre, CSCS, who developed tools for fast visualization of time-dependent, hierarchical, multi-block data as well as for the generation of movie. His solutions are on top of the freeware graphics package ParaView and the commercial package AVS/Express.

ParaView extensions

We presents some early results obtained with the ParaView (version 1.4.3) extensions by Jean Favre.
A few minor changes were necessary to obtain valid 2D and 3D graphics: vtkHierarchicalBoxDataSet is modified to do a different evaluation of cell coverage. A vtkHierarchicalSurfaceFilter is created to obtain polygon display of 2D AMR results. This in turn required the modification of vtkDataSetSurfaceFilter to handle vtkUniformGrid (previously not accounted for).
The data interface reads our custom data format for AMR and was developped as a VTK class to produce a vtkHierarchicalBoxDataSet.

2D AMR Visualization of a Magnetic Jet

3D AMR Visualization of Colliding Wind Binaries

AVS/express extensions

AVS/express already supports multi-block visualization. AVS/express modules developed by Jean Favre include:
Examples of visualization using adaptive meshing with AVS/express
grids.297.gif grids.367.gif grids.382.gif grids.421.gif
density.297.gif density.367.gif density.382.gif density.421.gif

All simulations use multi-zone grids with up to 5 levels of hierarchical refinement. Four different time steps show here the adaptive grid refinement. (zooming at level 4). We see the grids' bounding boxes and the corresponding density contours.

We further acknowledge the support of Dr. Ronald Peickert and Daniel Megert, who developed in his diploma thesis modern and fast visualization tools for our data based on AVS 5.


Jean M. Favre, Rolf Walder, and Doris Folini
Visualization of Astrophysical Data with AVS/Express,

CRAY User Conference, Stuttgart, 1998.
Available as a 650KB gzipped postscript file.

Jean M. Favre,
Accelerating the AVS/Express multi-block visualization macros,

10th IEEE Visualization Conference, Late Breaking Hot Topics,
San Francisco, USA (October 1999).
Available as a PDF.

Send comments to:
Doris Folini and Rolf Walder
Last Update: October 14, 2002