In this study, supercavitating flow impacted by shock is numerically investigated. The physical model based on inviscid compressible Euler equations is adopted by assuming that two-phase regime is a homogeneous mixture of liquid and vapor which remains in kinematic and thermodynamic equilibrium and behaves as one single fluid. The thermodynamic properties of pure liquid and two-phase mixture are modeled by Tait equation of state (EOS) and isentropic formulation, respectively. The physical model provides a macroscopic description of phase transition and is hyperbolic in time. The inviscid fluxes of governing equations are discretized using cell-centered finite volume MUSCL scheme on triangular mesh, while time integration is performed with two-stage Runge–Kutta scheme. The numerical method is second-order accurate both in space and time. The assembled computational fluid dynamics (CFD) code is validated against analytical solution. Numerical simulation is carried out to study the interaction between supercavitation and pressure waves including shock wave as well as the wave propagation in single- and two-phase media. The subsequent time evolution of supercavity impacted by a pressure wave is strongly influenced by freestream flow speed and pressure wave strength. For a relatively low upstream flow velocity, the supercavity over underwater object may be deformed by a weak explosion wave. However, the supercavitation bubble formed at a high freestream speed appears much more stable. Under strong pressure wave, the supercavity experiences deformation along its boundary which may lead to local collapse. A well-developed supercavity profile is recovered soon after the wave exits the computational domain.
Simulation of Supercavitating Flow Accelerated by Shock
Intelligent Systems, Cont. (formerly: Microprocessor)
2013-03-16
8 pages
Article/Chapter (Book)
Electronic Resource
English
Simulation of Supercavitating Flow Accelerated by Shock
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