Experiment, Numerical Modeling, Numerical Simulation, and Their Roles in the Study of Convection

1998 ◽  
pp. 239-251 ◽  
Author(s):  
J. C. Wyngaard
Keyword(s):  
Numerical Simulation ◽  
Numerical Modeling

NUMERICAL SIMULATION OF THE LIGHT AIRCRAFT PROPELLER NOISE UNDER STATIC CONDITION

Akustika ◽  
2021 ◽  
pp. 100-106
Author(s):  
sergey Timushev ◽  
Alexey Yakovlev ◽  
Petr Moshkov
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Numerical Modeling ◽  
Vortex Method ◽  
Static Condition ◽  
Semiempirical Model ◽  
Calculation Methods ◽  
Propeller Noise ◽  
Calculation Results ◽  
Static Conditions

The problem of simulation the noise generated during the operation of the propeller is considered. Calculation methods are described and numerical simulation of the noise of a light aircraft propeller by the acoustic-vortex method is performed. The results of numerical modeling of the tonal components of the propeller noise when operating under static conditions are compared with experimental data and calculation results based on a semiempirical model.

A Semi-Discrete Approach for the Numerical Simulation of Freestanding Blocks

2016 ◽  
pp. 416-439
Author(s):  
Fernando Peña
Keyword(s):  
Differential Equation ◽  
Numerical Simulation ◽  
Numerical Modeling ◽  
Discrete Model ◽  
Mathematical Formulation ◽  
Equation Of Motion ◽  
Rigid Bodies ◽  
The Body ◽  
Discrete Approach ◽  
Rocking Motion

This chapter addresses the numerical modeling of freestanding rigid blocks by means of a semi-discrete approach. The pure rocking motion of single rigid bodies can be easily studied with the differential equation of motion, which can be solved by numerical integration or by linearization. However, when we deal with sliding and jumping motion of rigid bodies, the mathematical formulation becomes quite complex. In order to overcome this complexity, a Semi-Discrete Model (SMD) is proposed for the study of rocking motion of rigid bodies, in which the rigid body is considered as a mass element supported by springs and dashpots, in the spirit of deformable contacts between rigid blocks. The SMD can detect separation and sliding of the body; however, initial base contacts do not change, keeping a relative continuity between the body and its base. Extensive numerical simulations have been carried out in order to validate the proposed approach.

scholarly journals Solution of Acoustic Tomographic Problems on the Basis of Numerical Simulation of Particle Dynamics

2018 ◽  
Vol 155 ◽  
pp. 01019
Author(s):  
Angela Kuzovova ◽  
Ivan Kuzmenko
Keyword(s):  
Numerical Simulation ◽  
Numerical Modeling ◽  
Wave Propagation ◽  
Continuous Media ◽  
Particle Dynamics ◽  
Direct Wave ◽  
Backward Wave ◽  
Propagation Of Waves ◽  
Backward Propagation

A method is proposed for imaging of scattering heterogeneities in continuous media on the basis of numerical modeling of forward and backward wave propagation. It is shown that the combination of a solution for backward propagation of waves and direct wave propagation allows us to visualize scattering heterogeneities. The results of numerical simulation are presented.

Numerical Modeling of Oil Spill with Tidal and Wind-Driven Coupled Model in Bohai Bay

2013 ◽  
Vol 423-426 ◽  
pp. 1394-1397
Author(s):  
Ming Chang Li ◽  
Guang Yu Zhang ◽  
Qi Si ◽  
Shu Xiu Liang ◽  
Zhao Chen Sun
Keyword(s):  
Numerical Simulation ◽  
Numerical Modeling ◽  
Oil Spill ◽  
Hydrodynamic Model ◽  
Field Data ◽  
Coupled Model ◽  
Bohai Bay ◽  
Trajectory Simulation ◽  
Simulation Results

Based on the hydrodynamic model and wind field data, a multi-module coupled oil spill model is constructed for simulating the trajectory of oil movement. A case study is researched in Bohai Bay. The model works well and the numerical simulation results show the model is suitable for oil spill trajectory simulation. Two cases are considered with and without wind to show its important influence for the oil spill.

The Numerical Simulation Analysis of Tuyere's Temperature Field and Stress Field

2013 ◽  
Vol 706-708 ◽  
pp. 1701-1704 ◽  
Author(s):  
Xi Ping Guo ◽  
Wen Yue Han
Keyword(s):  
Numerical Simulation ◽  
Numerical Modeling ◽  
Temperature Field ◽  
Stress Field ◽  
Simulation Analysis

Research on the temperature field and stress field of tuyere by numerical modeling and analyse the influence of structure on tuyere's property.

Numerical Simulation of Free-Surface Turbulence

1994 ◽  
Vol 47 (6S) ◽  
pp. S163-S165
Author(s):  
Douglas G. Dommermuth ◽  
Rebecca C. Y. Mui
Keyword(s):  
Numerical Simulation ◽  
Numerical Modeling ◽  
Free Surface ◽  
Numerical Simulations ◽  
Free Surface Flows ◽  
Direct Numerical Simulations ◽  
Large Eddy Simulations ◽  
Surface Flows ◽  
Large Eddy ◽  
Free Surface Turbulence

Direct numerical simulations and large-eddy simulations of turbulent free-surface flows are currently being performed to investigate the roughening of the surface, and the scattering, radiation, and dissipation of waves by turbulence. The numerical simulation of turbulent free-surface flows is briefly reviewed. The numerical, modeling, and hardware issues are discussed.

Prediction of Mechanical Properties of Ceramic Biocomposite on the Basis of Numerical Modeling

2017 ◽  
Vol 743 ◽  
pp. 172-175 ◽  
Author(s):  
Valentina A. Mikushina ◽  
Igor Yu. Smolin ◽  
Yury N. Sidorenko
Keyword(s):  
Mechanical Properties ◽  
Numerical Simulation ◽  
Numerical Modeling ◽  
Stress Distribution ◽  
Damage Accumulation ◽  
Strength Criterion ◽  
Stress Distributions ◽  
Mesoscopic Level ◽  
Distribution Laws ◽  
Prediction Of Mechanical Properties

The numerical simulation of biocomposites consisting of zirconia-based ceramics and cortical bone was performed with the use of a multilevel approach. The mechanical properties of the ceramic biocomposite were determined. The evolution of mesoscopic stress distributions in the biocomposite components during the process of its deformation was investigated, taking into account damage accumulation up to the fulfillment of the macro strength criterion. It is shown that damage accumulation has an impact on the stress distribution laws at the mesoscopic level, which is manifested through the appearance of a threshold for the stress distribution, as well as through a significant decrease in the distribution amplitude.

scholarly journals Observation and numerical modeling of physical oceanography in the Balikpapan Bay, East Kalimantan: preliminary results

DEPIK ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 130-135
Author(s):  
Mutiara Rachmat Putri ◽  
Iwan P Anwar ◽  
Zetsaona Sihotang ◽  
Lamona I. Bernawis ◽  
Agus Setiawan ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Numerical Modeling ◽  
Marine Ecosystem ◽  
Capital City ◽  
Physical Oceanography ◽  
East Kalimantan ◽  
National Capital ◽  
Océanographic Survey ◽  
Water Stratification ◽  
Oceanographic Conditions

The Indonesian government plans to move the capital city from Jakarta to Penajam Paser Utara (PPU) which is the upstream area of Balikpapan Bay, East Kalimantan. There are several activities in the planned new capital city that potentially affect the condition of land and marine ecosystems, including clearing new land for housing and agriculture as well as expanding mining and petroleum areas. Directly or indirectly, these activities could affect the oceanographic conditions of Balikpapan Bay. For this reason, in order to obtain an up-to-date picture of Balikpapan Bay, an oceanographic survey was conducted in early March 2020. In addition, to support the analysis of marine dynamics in these waters and their predictions in the future, numerical simulations of hydrodynamic modeling were also carried out. Oceanographic observations indicate significant water stratification in the area about 20 km from the mouth of the bay. This result is also well illustrated in the hydrodynamic model numerical simulation, where there is a water loop at the confluence between salt and fresh water masses from two rivers 18-20 km from the mouth of Balikpapan Bay. Keywords:The national capital city of IndonesiaBalikpapan BayPhysical oceanography ObservationCoastal and marine Ecosystem

Study of Effective Elastic Moduli of Cracked Solid

2003 ◽  
Author(s):  
Young H. Park ◽  
Wesley Morgan
Keyword(s):  
Numerical Simulation ◽  
Numerical Modeling ◽  
Material Properties ◽  
Numerical Scheme ◽  
Analytical Approach ◽  
Elastic Moduli ◽  
Solid Material ◽  
Effective Elastic Moduli ◽  
Effective Moduli ◽  
Mechanical Responses

In this paper, effective moduli of cracked solid material were investigated. An analytical approach is discussed for a cracked solid containing randomly oriented inclusions by using elastic potential and a standard tensorial basis. A numerical simulation of the testing of mechanical responses of samples of cracked solid material (porous material) is also carried out. The numerical scheme in this work will focus mainly on numerical modeling of the observed behavior, in particular, the dependence of the macroscopic material properties on the porocity.

scholarly journals Numerical simulation of aerodynamics of a high-efficiency orthogonal balanced blade of a wind generator

2018 ◽  
Vol 251 ◽  
pp. 04063
Author(s):  
Valeriy Prokopiev ◽  
Irina Lantsova ◽  
Andrey Proskurin
Keyword(s):  
Numerical Simulation ◽  
Numerical Modeling ◽  
Turbulent Flow ◽  
High Efficiency ◽  
Two Dimensional ◽  
Wind Generator ◽  
Rotating Blade

The results of verification of numerical modeling of a rotating blade of a wind generator with a nonstationary turbulent flow around in a two-dimensional formulation are given. A design free from the drawbacks of a single-blade orthogonal high-efficiency turbine is considered (US Patent Victor Lyatkher, US 8007235 B1, August 30, 2011, RF Patent 2426911 C1).

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