Abstract
Two main types of cavitation can be observed in hydraulic machinery: Sheet cavitation which consists of a vapour region adjacent to the body surface and cloud cavitation formed by small cavitation bubbles. The different physical properties of these two cavitation types are treated by two individual models. The investigation of sheet cavitation concentrates on the direct numerical simulation of the vapor/liquid interface. Working with overlapping grids a Chimera grid scheme is applied to describe the geometry of the vapor sheet. The incompressible flow field is determined by a two-dimensional Navier-Stokes code in combination with the turbulence model of Baldwin-Lomax. The cloud cavitation model is based on an averaged two-phase model: In a macroscopic view the fluid is assumed to be viscous and compressible characterized by the volume averaged void fraction. At the microscopic scale clusters of small spherical cavitation bubbles are considered. The two models for sheet and cloud cavitation are applied to cavitating flow in convergent-divergent channels and around NACA hydrofoils and the results are compared with experiments.
| Original language | English |
|---|---|
| Pages (from-to) | 523-524 |
| Number of pages | 2 |
| Journal | ZAMM Zeitschrift fur Angewandte Mathematik und Mechanik |
| Volume | 76 |
| Issue number | SUPPL. 1 |
| State | Published - 1996 |
| Externally published | Yes |