This paper presents finite volume method based on Reynolds-averaged Navier-Stokes (RANS) equations for computation of 2D axisymmetric flow around bare submarine hull using unstructured grid. The body used for this purpose is a standard DREA (Defence Research Establishment Atlantic) bare submarine hull. Shear Stress Transport (SST) k-ω model has been used to simulate turbulent flow past the hull...

For analyzing the flow field and topological structure of hemispherical parachute in low angles of attack, a fluid-structure interaction (FSI) simulation technique is established to decide the shape of the hemispherical parachute during terminal descent. In the fluid simulation, the semi-implicit method for pressure-linked equations consistent (SIMPLEC) algorithm is introduced to solve shear st...

Throughout this paper, R will denote a commutative ring with identity and M is a unitary R- module and Z will denote the ring of integers. We introduce the graph Ω(M) of module M with the set of vertices contain all nontrivial non-essential submodules of M. We investigate the interplay between graph-theoretic properties of Ω(M) and algebraic properties of M. Also, we assign the values of natura...

In the present paper, a comparative study of different cylindrical and conical substructures was performed under breaking wave loading with open-source Computational Fluid Dynamics (CFD) package OpenFoam capable development numerical tank (NWT) use Reynolds-Averaged Navier–Stokes (RANS) equations, k-ω Shear Stress Transport (k-ω SST) turbulence model, volume fluid (VOF) method. The validity NWT...

This article presents a new turbulence closure based on the k-ω SST model for predicting turbulent flows of Herschel–Bulkley fluids, including Bingham and power-law fluids. The has been calibrated with direct numerical simulations (DNS) data fully-developed pipe flow shear-thinning viscoplastic shows good agreement in mean velocity, average viscosity, shear stress budget friction factor. latter...

Abstract A study into the effect of tip clearance on ducted propellers was carried out. Two series propellers, namely B-series and Kaplan-series, were used. The gap between propeller varied from 2mm to 5mm. conducted numerically using computational fluid dynamics (CFD) approach. solver is based Reynolds-Averaged Navier-Stokes (RANS) solutions two turbulence modelling, i.e. k-ω SST by Menter exp...

Jet nozzle is a core component of the hydraulic perforating fracturing tool, and design structure directly affects effectiveness efficiency. In this paper, flow field characteristics nozzles are calculated by SST k- ω turbulence model. The results show that parameters significantly influence jet performance. Through orthogonal experiments, conical-cylindrical geometric preliminarily optimized a...

K-complex is an underlying pattern in the sleep EEG. Due to the role of sleep studies inneurophysiologic and cognitive disorders diagnosis, reliable methods for analysis and detection of this patternare of great importance. In our previous work, Synchrosqueezing Transform (SST) was proposed for analysisof this pattern. SST is an EMD-like tool, which benefits from wavelet transform and reallocat...