Submitted for the DFD08 Meeting of The American Physical Society Deformation of Elastic Particles in Viscous Shear Flow TONG GAO, HOWARD HU, University of Pennsylvania — The dynamics of two dimensional elastic particles in a Newtonian viscous shear flow is studied numerically. A constitutive equation is constructed for an incompressible “Neo-Hookean” elastic solid where the extra stress tensor ...

Abstract This work aims to improve the turbulence modeling in RANS simulations for particle-laden flows. Using DNS data as reference, errors of model assumptions Reynolds stress tensor and transport equations are extracted serve target a machine learning process called SpaRTA (Sparse Regression Turbulent Stress Anisotropy). In present work, algorithm is extended so that additional quantities ca...

Although recent advances of four-dimensional (4D) flow magnetic resonance imaging (MRI) has introduced a new way to measure Reynolds stress tensor (RST) in turbulent flows, its measurement accuracy and possible bias have remained be revealed. The purpose this study was compare the 4D MRI particle image velocimetry (PIV) terms velocity turbulence quantification. Two difference rates 10 20 L/min ...

Hydraulic conditions required to initiate movement of unanchored residue materials are identified in the present study. Selected amounts of corn, cotton, pine needles, sorghum, soybean, sunflower, and wheat residue are placed in a flume on a sand surface, and flow is then introduced at the top of the flume in progressive increments. The discharge rate and flow velocity necessary to cause residu...

Attention is focused in this paper on: (i) definitions of alternate measures of “stress-resultants” and “stress-couples” in a finitely deformed shell (finite mid-plane stretches as well as finite rotations); (ii) mixed variational principles for shells, undergoing large mid-plane stretches and large rotations, in terms of a stress function vector and the rotation tensor. In doing so, both types...

The swirl flow plays a central role in combustion systems. It is important to capture all phenomena associated with it. In particular, lean partially premixed combustion in gas turbine combustion chamber is often associated with hydrodynamic instabilities, known as processing vortex core (PVC). Therefore an unconfined swirl flow with a precessing vortex core is being studied in presented work b...

Viscoelastic flows of polymer solutions in complex geometries can generate a strong localization stress within small regions the fluid and formation birefringent strands. In porous media, these localized structures drive preferential flow paths increase global dissipation. Modeling impact such effects at Darcy or larger scales is daunting task—one reasons being lack approaches using homogenizat...