Bu çalışmada DARPA SUBOFF su altı aracının manevra benzetimlerinde kullanılacak hidrodinamik katsayılarının hesaplanmasında izlenecek yöntem statik sürükleme (İng. static drift) test benzetimleri ile belirlenmiştir. Su araçlarının manevralarının belirlenmesinde kullanılan katsayıların sayısal olarak yeterli doğrulukta elde edilmesi, çözümlemelerde çözüm ağı ve türbülans modelleri ilişkilidir. Ç...

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...

A rapid predictive tool based on the linearised Reynolds-averaged Navier-Stokes equations is proposed in this work to investigate secondary currents generated by streamwise-independent surface topography modulations turbulent channel flow. The derived coupling momentum equation Spalart-Allmaras transport for eddy viscosity, using a nonlinear constitutive relation Reynolds stresses capture corre...

Abstract The paper explains further developments of a new concept called TNC (Thickness Noise Control) the application surface ventilation to reduction helicopter rotor low-frequency in-plane harmonic (LF-IPH) noise. method is based on introduction four cavities covered by perforated plates (connected low and high pressure reservoirs) positioned symmetrically at front rear extremities blade tip...

For turbulent channel flow, pipe and zero-pressure gradient boundary layer, Heinz yielded recently analytical formulas for the eddy viscosity as a product of function (the wall-normal distance scaled in inner units) same outer units). By calculating eddy-viscosity diffusion term, an exact high-Reynolds-number equation with one production two dissipation terms is constructed those flows. One ter...

The present study focuses on the impact of eddy viscosity turbulence models benchmark INSEAN E779A marine propeller hydroacoustic performance under non-cavitating and open water conditions. In numerical calculations, Realisable k-epsilon (k-?), k-? Shear Stress Transport (k-? SST) Spalart-Allmaras models, which are widely used in hydrodynamic fields, selected. Hydroacoustic model is predicted w...

Machine learning (ML) is a rising and promising tool for Reynolds-Averaged Navier–Stokes (RANS) turbulence model developments, but its application to industrial flows hindered by the lack of explainability ML model. In this paper, two types methods improve are presented, namely intrinsic that reduce complexity post-hoc explain correlation between inputs outputs. The investigated ML-assisted fra...

An optimization tool for offshore bottoming cycle and heat recovery steam generator (HRSG) design has previously been developed. The is based on empirical correlations to obtain hydraulic thermal quantities the HRSG. However, as these are experiments with typical onshore designs, they may not be valid compact designs encountered in HRSGs.In order extend validity range of tool, this work present...

In this work, in the area of Computational Fluid Dynamics (CFD), more specifically thermofluid dynamics for two-dimensional flows (2D), and also considering, fluid-body interaction, allied to phenomena heat-transfer by mixed convection beginning processes turbulent flow phenomenon a study is proposed that demonstrates efficiency analysis simulation these complex phenomena. We adopt an Eulerian ...

This paper provides 2D Computational Fluid Dynamics (CFD) investigations, using OpenFOAM package, of the unsteady separated fully turbulent flows past a NACA 0015 airfoil undergoing sinusoidal pitching motion about its quarter-chord axis in deep stall regime at reduced frequency 0.1, free stream Mach number 0.278, and Reynolds number, based on chord length, , . First, eighteen steady-state comp...