Computational fluid dynamics is increasingly used to investigate the inherently complicated phenomenon of wave breaking. To date, however, no single model has proved capable accurately simulating breaking process across entirety surf zone for both spilling and plunging breakers. The present study newly considers Reynolds stress– $\omega$ turbulence closure this purpose, where specific dissipati...

Turbulence equilibrium state is analyzed for the modeled Reynolds-stress transport equation, assuming most general formulation of pressure–strain correlation. In a two-dimensional mean flow at high-Reynolds number, an algebraic equation system obtained, providing anisotropies as functions model coefficients. Conversely, equations provide calibration conditions coefficients to predict specified ...

Characteristic features of squeeze film lubrication between two rectangular plates, of which, the upper plate has a roughness structure, in the presence of a uniform transverse magnetic field are examined. The fluid in the film region is represented by a viscous, incompressible and electrically conducting couple-stress fluid. The thickness of the fluid film region is h and that of the roughness...

When a shock wave impinges upon a wall, it penetrates the boundary layer along the surface and both the shock wave and the boundary layer are changed from their undisturbed states. If the boundary layer remains unseparated, these mutually induced changes take place in a small interaction region. For a turbulent boundary layer, it has been established [1-8] that an asymptotic description of the ...

Certain flows denominated as amplifiers are characterised by their global linear stability while showing large linear amplifications to sustained perturbations. As the forcing amplitude increases, a strong saturation of the response appears when compared to the linear prediction. However, a predictive model that describes the saturation of the response to higher amplitudes of forcing in stable ...

A new methodology of turbulence modeling is proposed by combining a statistical theory [T. Ariki, Phys. Fluids 31, 065104 (2019)] and the Reynolds-stress-root method Rev. E 92, 053010 (2015)], aiming at realizing practical model wider applicability with help theoretical support. The resultant integrates, same time, following five features: coordinate covariance, realizability condition, near-wa...

A CFD-driven deterministic symbolic identification algorithm for learning explicit algebraic Reynolds-stress models (EARSM) from high-fidelity data is developed building on the frozen-training SpaRTA of [1]. Corrections Reynolds stress tensor and production transported turbulent quantities a baseline linear eddy viscosity model (LEVM) are expressed as functions polynomials selected library cand...