Detached Eddy Simulation on a 13 M grid is conducted for a KVLCC2 tanker hull form at drift angle 301. The objective is to identify and analyze the vortical structures, instabilities, and turbulent structures with analogy to the vortex breakdown and helical instability analysis for delta wing at large angles of attack. One shear layer, one Karman-like vortex shedding, and three helical mode ins...

A parallel multi-zone method for the simulation of large-scale multidisciplinary applications involving field equations from multiple branches of physics is outlined. The equations of mathematical physics are expressed in a unified form that enables a single algorithm and computational code to describe problems involving diverse, but closely coupled, physics. Specific sub-disciplines include fl...

We analyze two-component spatial optical vortex solitons supported by parametric wave mixing processes in a nonlinear bulk medium. We study two distinct cases of such localized waves, namely, parametric vortex solitons due to phase-matched second-harmonic generation in an optical medium with competing quadratic and cubic nonlinear response, and vortex solitons in the presence of third-harmonic ...

Modeling the vortex intensification of turbulent heat transfer in narrow engine ducts using single-row dimples was carried out within framework multi-block computing technologies implemented a special VP2/3 package. The cases rectangular section with placement generators—single-row packages oval and spherical on initial hydrodynamic stabilized flow are excluded. connection between generated str...

This paper deals with the design and implementation of cross-platform, D2Q9-BGK D3Q27-MRT, lattice Boltzmann method solver for 2D 3D flows developed ArrayFire library high-performance computing. The leverages ArrayFire’s just-in-time compilation engine compiling high-level code into optimized kernels both CUDA OpenCL GPU backends. We also provide C++ Rust implementations show that it is possibl...

We propose very general vortex nucleation mechanisms[1] analogous to a hydrodynamic instability and calculate associated critical velocity in agreement with experiments. The creation of vortices via extrinsic mechanism is driven by a formation of the surface vorticity sheet created by the flow, which reaches a critical size. Such a sheet screens an attraction of a half-vortex ring to the wall, ...

We perform a theoretical study into how dipole-dipole interactions modify the properties of superfluid vortices within the context of a two-dimensional atomic Bose gas of co-oriented dipoles. The reduced density at a vortex acts like a giant antidipole, changing the density profile and generating an effective dipolar potential centred at the vortex core whose most slowly decaying terms go as 1/...

In this work, the Engine Combustion Network Spray G injector was mounted in Darmstadt optical-accessible engine to study phenomena typical of multi-hole, early direct-injection events spark-ignition engines characterized by tumble flow charge motion. Dedicated experimental measurements both in-cylinder spray morphology and velocities before after injection process were carried out assess adopte...

a brass vortex tube (vt) with interchangeable parts is used to determine the optimum cold end orifice diameter, main tube length and diameter. experiments were carried out to study the effects of operating pressure as well. it is shown that there is an optimum value for cold end orifice diameter, which is equal to 4mm and there is an optimum value for cold and hot exit temperature difference at...

BACKGROUND Flow patterns in univentricular hearts may have clinical value. Therefore, it is our objective to asses and characterize vortex flow patterns with Fontan circulation in comparison with healthy controls. METHODS Twenty-three patients (8 Fontan and 15 normal patients) underwent echocardiography with intravenous contrast agent (Sonovue®) administration. Dedicated software was used to ...