Researchers, Developers and Staffs
Masako  IWATA Masako IWATA


Research Themes

Development of simulation solvers of fluid dynamics with heat transfer using adaptive octree mesh refinement.
A study of octree data structures most suited to adaptive mesh refinement.

Research Subjects and Results

There is growing momentum in the world of numerical fluid dynamics for a re-evaluation of orthogonal grid-based calculations. This is because the burden of forming grids that fit the surface of an object is becoming increasingly difficult with the growing complexity of the simulation field. Creating orthogonal grids is easy, but their precision in reproducing shapes is low while making the grids finer to improve it entails a high calculation cost.
The Octree grids retain the simplicity of the orthogonal grid while making up for its deficiency by allowing for local segmentation into eight smaller grids. In order to apply Octree grids in simulation, the data structure must be efficient in terms of calculation costs and memory utilization. In order to apply Octree grids in simulation, the data structure must be efficient in terms of calculation costs and memory utilization.
We have therefore made studied comparisons among Standard Octree, Khokhlov's FTT-Octree, and our own proposed pedigree FTT-Octree (pFTT-Octree) containing genealogical information. We found that pFTT-Octree was the most suited to adaptive mesh refinement. We are currently developing a solver of fluid dynamics with heat transfer using a pFTT-Octree data structure.

VCAD Public Software

V-Xgen
V-Xpp
V-Sphere::CBC
V-Xpad
V-Xpit

Software Block Page


Selected Publications

ˇÚPapersˇŰ
Masako Iwata, Kenji Ono, Tsuyoshi Tamaki
ˇÖSimulation with adaptive mesh refinement using pFTT data structureˇ×
Proceedings of 10th ISGG conference on Numerical Grid Generation (2007)

ˇÚPatentsˇŰ
PCT/JP2003/015971 (USA2003)
ˇÖNumerical Study on Flow Field of Incompressive Viscous Fluid Using V-CAD Data Explicitlyˇ×
Lei Kangbin, Masako Iwata, Ryutaro Himeno, Kiwamu Kase

Selected Publications Page