cavitatingFoam - OpenFOAM Solver

Solver: cavitatingFoam   Description

cavitatingFoam is a pressure-based solver designed for transient flow simulations with cavitation, utilizing the Homogeneous Equilibrium Model (HEM). The HEM model is used to determine the compressibility of the liquid/vapor ‘mixture’, whose density varies from liquid to vapor density according to the selected barotropic equation of state.

The solver allows for the selection of RAS (Reynolds-Averaged Simulation) and LES (Large Eddy Simulation) turbulence models, accommodating both Newtonian and non-Newtonian fluids. The compressibility \(\psi\) (defined as a reciprocal of a square of the speed of sound) of the mixture defines the relation between density and pressure within the system. The \(\psi\) function is determined based on one of the available barotropic compressibility models: linear, Chung and Wallis. By offering varied approaches to represent the speed of sound within the liquid/vapor mixture, these models significantly influence the accuracy of cavitation simulation.

The solver uses the PIMPLE (merged PISO-SIMPLE) algorithm for pressure-momentum coupling. This algorithm leverages the strengths of both PISO and SIMPLE methods for pressure-velocity coupling, ensuring robustness in handling transient flows with large time steps.

The solver’s capability to accurately model cavitation dynamics offers substantial benefits across several industries. For instance, in the marine sector, it enables precise predictions of cavitation around propellers. In the piping industry, understanding cavitation within valves is crucial for enhancing their durability. Similarly, the solver aids in assessing cavitation effects on hydrofoils, which is vital for their endurance and performance.

Solver: cavitatingFoam   Features

  • Transient
  • Incompressible
  • Multiphase - Homogeneous Equilibrium Model (HEM)
  • 2 Immiscible Fluids (Liquid & Vapor)
  • Cavitation
  • Homogeneous Equilibrium Model (HEM)
  • Laminar and Turbulent (RANS, LES, DES)
  • Newtonian and Non-Newtonian Fluid
  • Pressure-Based Solver
  • Passive Scalar
  • PIMPLE Algorithm
  • Solution Limiters:
    • Velocity Damping

Solver: cavitatingFoam   Application

Rotating Machinery

  • Pumps (in the fixed position)
  • Turbines (in the fixed position)

Marine Industry

  • Propellers (in the fixed position)
  • Hydrofoils

Piping Industry

  • Piping Systems
  • Valves

Automotive Industry

  • Diesel Injector Nozzle

Solver: cavitatingFoam   Multiphase - Phase Change Solvers Comparison

Phase Change Solvers In this group, we have included solvers implementing Phase Change models to handle cavitation, and surface evaporation/condensation (liquid and its vapor phases).

Phase Change - Cavitation

  • cavitatingFoam 2 immiscible fluids, dedicated to cavitation, Homogeneous Equilibrium Model (HEM)
  • interPhaseChangeFoam 2 immiscible fluids, dedicated to cavitation, VoF, Phase Change Models: Schnerr-Sauer, Merkle, Kunz

Phase Change - Condensation / Evaporation

  • VoF - Volume of Fluid
  • DyM - Dynamic Mesh
  • Overset - also known as Chimera Grid (Method)