Optimization of a hydrodynamic separator using a multiscale computational fluid dynamics approach

2013 ◽  
Vol 68 (7) ◽  
pp. 1574-1581 ◽  
Author(s):  
Vivien Schmitt ◽  
Matthieu Dufresne ◽  
Jose Vazquez ◽  
Martin Fischer ◽  
Antoine Morin
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Conceptual Model ◽  
Porous Wall ◽  
Global Model ◽  
Multiscale Approach ◽  
Separation Mechanism ◽  
Experimental Measurements ◽  
Expanded Metal ◽  
Computational Fluid Dynamics Cfd

This article deals with the optimization of a hydrodynamic separator working on the tangential separation mechanism along a screen. The aim of this study is to optimize the shape of the device to avoid clogging. A multiscale approach is used. This methodology combines measurements and computational fluid dynamics (CFD). A local model enables us to observe the different phenomena occurring at the orifice scale, which shows the potential of expanded metal screens. A global model is used to simulate the flow within the device using a conceptual model of the screen (porous wall). After validation against the experimental measurements, the global model was used to investigate the influence of deflectors and disk plates in the structure.

scholarly journals Mapping flow distortion on oceanographic platforms using computational fluid dynamics

Ocean Science ◽  
2013 ◽  
Vol 9 (5) ◽  
pp. 855-866 ◽  
Author(s):  
N. O'Sullivan ◽  
S. Landwehr ◽  
B. Ward
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Wind Speed ◽  
Close Agreement ◽  
Velocity Fields ◽  
Experimental Measurements ◽  
Flow Distortion ◽  
Direct Measurements ◽  
Computational Fluid Dynamics Cfd ◽  
Set Up

Abstract. Wind speed measurements over the ocean on ships or buoys are affected by flow distortion from the platform and by the anemometer itself. This can lead to errors in direct measurements and the derived parametrisations. Here we computational fluid dynamics (CFD) to simulate the errors in wind speed measurements caused by flow distortion on the RV Celtic Explorer. Numerical measurements were obtained from the finite-volume CFD code OpenFOAM, which was used to simulate the velocity fields. This was done over a range of orientations in the test domain from −60 to +60° in increments of 10°. The simulation was also set up for a range of velocities, ranging from 5 to 25 m s−1 in increments of 0.5 m s−1. The numerical analysis showed close agreement to experimental measurements.

Separation efficiency of a hydrodynamic separator using a 3D computational fluid dynamics multiscale approach

2014 ◽  
Vol 69 (5) ◽  
pp. 1067-1073 ◽  
Author(s):  
Vivien Schmitt ◽  
Matthieu Dufresne ◽  
Jose Vazquez ◽  
Martin Fischer ◽  
Antoine Morin
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Separation Efficiency ◽  
Perforated Plate ◽  
Global Model ◽  
Trapping Efficiency ◽  
Local Model ◽  
Multiscale Approach ◽  
Hydrodynamic Behavior ◽  
Particle Trajectories

The aim of this study is to investigate the use of computational fluid dynamics (CFD) to predict the solid separation efficiency of a hydrodynamic separator. The numerical difficulty concerns the discretization of the geometry to simulate both the global behavior and the local phenomena that occur near the screen. In this context, a CFD multiscale approach was used: a global model (at the scale of the device) is used to observe the hydrodynamic behavior within the device; a local model (portion of the screen) is used to determine the local phenomena that occur near the screen. The Eulerian–Lagrangian approach was used to model the particle trajectories in both models. The global model shows the influence of the particles' characteristics on the trapping efficiency. A high density favors the sedimentation. In contrast, particles with small densities (1,040 kg/m3) are steered by the hydrodynamic behavior and can potentially be trapped by the separator. The use of the local model allows us to observe the particle trajectories near the screen. A comparison between two types of screens (perforated plate vs expanded metal) highlights the turbulent effects created by the shape of the screen.

Modeling Evaporation Driven Self-Assembly Systems for Magnetic Storage Arrays

2006 ◽  
Vol 961 ◽  
Author(s):  
John Dyreby ◽  
Greg F. Nellis ◽  
Kevin T. Turner
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Self Assembly ◽  
Particle Distribution ◽  
Assembly Systems ◽  
Magnetic Storage ◽  
Experimental Measurements ◽  
Modeling Methodology ◽  
Global Regime ◽  
Computational Fluid Dynamics Cfd

ABSTRACTA modeling methodology based on computational fluid dynamics (CFD) has been developed that is appropriate for the global regime of lithographically directed, evaporation driven self-assembly. The modeling technique has been experimentally verified through comparison with the well-known benchmark case of evaporation driven self-assembly associated with the evaporation of a colloidal, self-pinned droplet. The predicted evolution of the particle distribution during evaporation is compared to optical experimental measurements of the particle distribution within an evaporating droplet containing fluorescing nanoparticles.

MODELING OF THE COMPLETE MECHANISM OF OXIDATION OF PHENYL RADICAL UNDER COMBUSTION CONDITIONS

2020 ◽  
Author(s):  
G. I. Tolstov ◽  
◽  
I. A. Medvedkov ◽  
D. P. Porfiriev ◽  
M. V. Zagidullin ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
High Temperature ◽  
Quantum Chemical ◽  
Experimental Measurements ◽  
Phenyl Radical ◽  
Flow Tube ◽  
Cfd Simulations ◽  
Computational Fluid Dynamics Cfd ◽  
Mechanism Of Oxidation

Quantum chemical calculations, computational fluid dynamics (CFD) simulations, and isothermal approximation were applied for the interpretation of experimental measurements of the reaction of С6Н5 + O2 in the high-temperature microreactor and of the pressure drop in the flow tube of the reactor.

Investigation on Breaking Focused Wave-Induced Loads on a Monopile With CFD Models

2018 ◽  
Author(s):  
Pietro D. Tomaselli ◽  
Ankit Aggarwal ◽  
Erik Damgaard Christensen ◽  
Hans Bihs
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Circular Cylinder ◽  
Breaking Waves ◽  
Offshore Structures ◽  
Experimental Measurements ◽  
Cfd Models ◽  
Computational Fluid Dynamics Cfd ◽  
Focused Wave ◽  
Wave Induced

The design of new offshore structures requires the calculation of the wave-induced loads. In this regard, the Computational Fluid Dynamics (CFD) methodology has shown to be a reliable tool, in the case of breaking waves especially. In this paper, two CFD models are tested in the reproduction of an experimental spilling wave impacting a circular cylinder. The numerical results from the models are shown together with the experimental measurements.

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