1. Introduction A great variety of flows with importance to practical engineering applications are inherently unsteady and virtually all of the Newtonian fluid flows in nature are turbulent. Therefore, it is natural and unavoidable to deal with unsteady turbulent flows when Computational Fluid Dynamics (CFD) techniques are applied to engineering design and industrial use. CFD for general fluid ...

To bridge the gap between high and low fidelity numerical modeling tools for vertical-axis (or cross-flow) turbines (VATs or CFTs), an actuator line model (ALM) was developed and validated for both a high and a medium solidity vertical-axis turbine at rotor diameter Reynolds numbersReD ∼ 10. The ALM is a combination of classical blade element theory and Navier–Stokes based flow models, and in t...

The paper employs a Reynolds-averaged Navier–Stokes (RANS) approach to investigate the time-dependent wave breaking processes. The numerical model is the smoothed particle hydrodynamic (SPH) method. It is a mesh-free particle approach which is capable of tracking the free surfaces of large deformation in an easy and accurate way. The widely used two-equation k–εmodel is chosen as the turbulence...

We present an algorithm for compressible Large Eddy Simulation (LES) using unstructured tetrahe-dral grids. Two methods for simulation of the sub-grid scale stresses are examined. The rst method is the Monotone Integrated Large Eddy Simulation (MILES) technique of Boris, Oran and Grinstein, whereby the energy transfer from the resolved scales to the subgrid scales is modeled using the inherent ...

This paper presents the results of large-eddy simulation (LES) a downward wall jet that encounters an upward flow in vertical rectangular channel, named negative buoyant fountain (NBF). The fluid has higher temperature than opposing stream so influence buoyancy force on physics mixing process can be investigated. Two subgrid-scale models available OpenFOAM platform, i.e. dynamic k-equation mode...

The Reynolds-averaged Navier-Stokes (RANS) equations for steady-state assessment of incompressible turbulent flows remain the workhorse practical computational fluid dynamics (CFD) applications. Consequently, improvements in speed or accuracy have potential to affect a diverse range We introduce machine learning framework surrogate modeling eddy viscosities RANS simulations, given initial condi...

This study focuses on the prediction of hydrodynamic and hydroacoustic performance a cavitating marine propeller in open water condition using Reynolds-averaged Navier-Stokes (RANS) Detached Eddy Simulation (DES) solvers. The effectiveness methods is investigated for recently introduced benchmark that belongs to research vessel ‘The Princess Royal’. main emphasis examine capabilities RANS DES s...

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Numerical simulations of complex large-scale flow systems must capture a variety of physical phenomena in order to predict the flow accurately. Currently, many flow solvers are specialized to simulate one part of a flow system effectively, but are either inadequate or too expensive to be applied to a generic problem. As an example, the flow through a gas turbine can be considered. In the compre...