ANALYSIS OF THE COMBUSTION PROCESS IN AN ENGINE ADAPTED WITH PRE-CHAMBER USING A ZERO DIMENSIONAL NUMERICAL MODEL AND A THREE-DIMENSIONAL MODEL

2018 ◽  
Author(s):  
Bruno Silva de Lima ◽  
Kilder Fagundes ◽  
Gabriel Faria ◽  
Tamara Passos Pimenta ◽  
Carlos Castilla
Keyword(s):  
Numerical Model ◽  
Combustion Process ◽  
Three Dimensional ◽  
Dimensional Model ◽  
Three Dimensional Model

scholarly journals NUMERICAL MODEL OF 3D MORPHODYNAMIC AFTER OFFSHORE NOURISHMENT

2011 ◽  
Vol 1 (32) ◽  
pp. 55 ◽  
Author(s):  
Masamitsu Kuroiwa ◽  
Yoko Shibutani ◽  
Yuhei Matsubara ◽  
Takayuki Kuchiishi ◽  
Mazen Abualtyef
Keyword(s):  
Numerical Model ◽  
Diffusion Equation ◽  
Suspended Sediment Concentration ◽  
Three Dimensional ◽  
Sediment Concentration ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Advection Diffusion Equation ◽  
Advection Diffusion ◽  
Sand Material

A three-dimensional model of morphodynamics after offshore nourishment was developed. In the presented model, the 3D beach evolution model that is not only after nourishment but also taking into account the nourishment process of injected sand material. In order to consider the injected process of sand, the computation using the advection-diffusion equation for suspended sediment concentration was adapted in the model. The presented model was applied to an idealized beach with two groins in order to investigate the performance of the model, and then, the model was applied to a field observation result for shoreface nourishment carried out at the Egmond aan Zee in the Netherlands. Finally, the applicability of the presented model was discussed from the computed results.

The Numerical Investigation of Cracking Areas under Nonuniform Settlements of the Construction

2014 ◽  
Vol 472 ◽  
pp. 141-145
Author(s):  
Maria L. Bartolomey ◽  
Igor N. Shardakov ◽  
Nikolai A. Trufanov
Keyword(s):  
Numerical Model ◽  
Numerical Investigation ◽  
Three Dimensional ◽  
Strained State ◽  
Dimensional Model ◽  
Three Dimensional Model

We investigate the tensely-strained state of three-dimensional construction at the measured settlements of the foundation. The numerical model of the construction is developed within the limits of the theory of the plates bending and rectilinear rods, it allows to reveal dangerous places in the strength members particularly in the interfloor plate. The three-dimensional model of the dangerous area is developed, which allows to define the level of damaging the plates material. Settlements levels leading to first cracks and full destruction of the investigated area of the construction are defined.

Formation of Sand Ripples Under Turbulent Flow Simulated by LES

2010 ◽  
Author(s):  
Yan Cui ◽  
John C. Wells ◽  
Y. Quoc Nguyen
Keyword(s):  
Shear Stress ◽  
Numerical Model ◽  
Three Dimensional ◽  
Sand Wave ◽  
Bed Shear Stress ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Eddy Simulation ◽  
Large Eddy

To simulate the initial formation of sedimentary bedforms, constrained to be in hydraulically smooth turbulent flows under bedload conditions, a numerical model based on Large Eddy Simulation (LES) in a doubly periodic domain has been developed. The numerical model comprises three parts. Given the instantaneous bed geometry, the bed shear stress distribution is obtained from a Large-Eddy-Simulation (LES) method coupled with an Immersed-Boundary-Method (IBM). Flux is estimated by the van Rijn’s formula [1]. Finally, evolution of the bed surface is described by the Exner equation. “Two-dimensional bed” [2] and “three-dimensional bed” models employ, respectively, transversely averaged bed shear stress and instantaneous local shear stress to estimate the bedload flux. Based on this model, the evolution of an initial sand wave has been successfully computed. Compared to the “two-dimensional” [2] model, the three-dimensional model leads to a slightly slower propagation and a smaller sand wave. The tendency of the sand wave evolution in three-dimensional model is two-dimensional during the simulated interval.

Numerical Simulation of Vertical Forced Plume in a Crossflow of Stably Stratified Fluid

1995 ◽  
Vol 117 (4) ◽  
pp. 696-705 ◽  
Author(s):  
Robert R. Hwang ◽  
T. P. Chiang
Keyword(s):  
Numerical Simulation ◽  
Numerical Model ◽  
Cross Section ◽  
Three Dimensional ◽  
Experimental Measurements ◽  
Secondary Vortex ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Vortex Pairs ◽  
Plume Flows

In this study, an investigation using a three-dimensional numerical model, which treats conservation of mass, momentum, and salinity simultaneously, was carried out to study the character of a vertical forced plume in a uniform cross-stream of stably linear stratified environment. A k-ε turbulence model was used to simulate the turbulent phenomena and close the solving problem. The performance of the three-dimensional model is evaluated by comparison of the numerical results with some available experimental measurements. Results indicate that the numerical computation simulates satisfactorily the plume behavior in a stratified crossflow. The secondary vortex pairs in the cross section induced by the primary one change as the plume flows downstream. This denotes the transformation of entrainment mechanism in stratified crossflow.

A THREE-DIMENSIONAL MODEL OF DISCHARGED COLD WATER JET IN COASTAL AREA

2017 ◽  
Author(s):  
Yasuo Niida ◽  
Yasuo Niida ◽  
Norikazu Nakashiki ◽  
Norikazu Nakashiki ◽  
Shin’ichi Sakai ◽  
...  
Keyword(s):  
Numerical Model ◽  
Coastal Area ◽  
Cold Water ◽  
Three Dimensional ◽  
Coastal Region ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Water Dispersion ◽  
Water Jets ◽  
Good Agreement

In this study, a three-dimensional numerical model for cold water jets in the coastal region is developed for the calculation of not only the initial mixing but also horizontal dispersion above the seabed. The computed velocities and temperatures were compared with the measurements obtained in the scaled hydraulic experiment. The good agreement with measurements confirms the model provides appropriate results for cold water dispersion. Our numerical results indicate that coastal topography is the most important factor in determining areas influenced by discharged cold water.

A THREE-DIMENSIONAL MODEL OF DISCHARGED COLD WATER JET IN COASTAL AREA

2017 ◽  
Author(s):  
Yasuo Niida ◽  
Yasuo Niida ◽  
Norikazu Nakashiki ◽  
Norikazu Nakashiki ◽  
Shin’ichi Sakai ◽  
...  
Keyword(s):  
Numerical Model ◽  
Coastal Area ◽  
Cold Water ◽  
Three Dimensional ◽  
Coastal Region ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Water Dispersion ◽  
Water Jets ◽  
Good Agreement

In this study, a three-dimensional numerical model for cold water jets in the coastal region is developed for the calculation of not only the initial mixing but also horizontal dispersion above the seabed. The computed velocities and temperatures were compared with the measurements obtained in the scaled hydraulic experiment. The good agreement with measurements confirms the model provides appropriate results for cold water dispersion. Our numerical results indicate that coastal topography is the most important factor in determining areas influenced by discharged cold water.

Sign in / Sign up

Export Citation Format

Share Document