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CFD Research Corporation (CFDRC) has developed a new cavitation
model, suitable for multi-dimensional simulations of cavitating
flows. The model is referred as "The Full Cavitation Model";
it accounts for all the first-order physical effects:
- Phase Change
- Bubble Dynamics
- Turbulence
- Presence of Non-Condensable Gases
The model's mathematical basis, validation and applications have been
published in several papers (recent references).
It utilizes modified Rayleigh-Plesset equations of bubble dynamics
to obtain the phase change rates for vapor generation and condensation
in the cavitating regions.
The model is applicable to a wide range of engineering problems
without the need for a-priori prescription of type and location
of cavitation regions. In all steady-state and transient simulations,
the predicted vapor fractions and pressures are realistic (e.g.
minimum absolute pressure is always positive). Successful applications
include:
- Hydrofoil and Ogives
- Orifice Flows
- Axial Water Pumps
- Centrifugal Water Pumps
- Diesel Fuel Injectors
- Automotive Oil Pumps
- Shock Absorbers
- Aerospace LOX Turbopumps
These problems cover a wide range of operating and physical conditions:
fluid/vapor density ratios of up to 70,000 (water as working fluid),
flows with very high pressure drops (fuel injectors up to 250 MPa),
moving/deforming domains (oil pump, shock absorbers), fast flows
(hydrofoil), and flows in complex, rotating geometries (turbopump,
water pump).
The model is presently being further developed to include the effects
of:
- degasification/deaeration
- temperature variations
The basic model has been incorporated in CFD-ACE+
software ( Now available from ESI-Group).
Please contact us for further collaborative
developments and advanced applications.
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