Modern Parallel Architectures to Speed Up Numerical Simulation

2019 ◽  
pp. 259-269
Author(s):  
Mikhail Lavrentiev ◽  
Konstantin Lysakov ◽  
Alexey Romanenko ◽  
Mikhail Shadrin
Keyword(s):  
Numerical Simulation ◽  
Parallel Architectures ◽  
Speed Up

Examination on Influence Caused by Air Injection Manners Changing in Aerobic-Anaerobic Landfill Method

2015 ◽  
Vol 768 ◽  
pp. 310-317
Author(s):  
Gang Zhen Jiao ◽  
Lei Zhang ◽  
Xiong Shi ◽  
Gui Fu
Keyword(s):  
Numerical Simulation ◽  
Mathematical Model ◽  
Organic Carbon ◽  
Simulation Model ◽  
Solid Phase ◽  
Landfill Gas ◽  
Air Injection ◽  
Carbon And Nitrogen ◽  
Speed Up ◽  
Leachate Quality

In this study, aerobic-anaerobic landfill method (AANM) is focused on as a new way to speed up landfill stabilization, inhibit landfill gas flux, and ameliorate on leachate quality. Numerical simulation model is developed to guide the air injection craftwork and study its effect on achieving above goals. On basis of work finished in last period (0~310 days), air was injected into Lysimeters A (Lys.A) at 0.5 m, and at 2.5 m in Lys.B with the same rate of 1 L/min. In Lys.C there is no air injected. In order to interview the influence by air injection manners changing, from 310 days till 360 days, air injection manners are changed from Mono-site into Double-site in Lys.A and in Lys. B it will be changed from bottom-site (2.5m) into middle-site (1.5m). In Lys.C there will be no changing. By interviewing the comparisons on simulated results in 50 days with and without air injection manners changing, it was found that air injection manners changing in Lys.A causes TOC discharging amount increase more than 6 times, but T-N and GHE resulted from landfill gas decrease 24.1% and 71 % respectively. Air injection manners changing in Lys.B resulted in discharged TOC and T-N increase 108.1 % and 53.5 % respectively, while T-N decreases 3.7 %. On basis of mechanism assumption, mathematical model was developed and according to the simulated results for 5 years, air injected at 2.5 m achieved improvements on stabilization of solid phase organic carbon and nitrogen for 34 % and 13 %, amelioration on leachate quality for 35 % and 62 % of TOC and T-N, and the restraint of GHE for 14 times compared with no air injection case.

Numerical Simulation of the Temperature Field and the Flow Field Inside the Domestic Cooling and Heating Unit’s Water Tank

2012 ◽  
Author(s):  
Chao Zhu ◽  
Mo Yang ◽  
Yuwen Zhang ◽  
Jinlong Wang
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Temperature Distribution ◽  
Flow Field ◽  
Water Temperature ◽  
Waste Heat ◽  
Flow Distribution ◽  
Water Tank ◽  
Heating Unit ◽  
Speed Up

A water tank of the domestic cooling and heating unit, which has a helix coil, is used to recover the waste heat of the unit. The temperature field and the flow field in the water tank have great effects on the variation of the water temperature in it. In order to obtain the temperature distribution, the flow distribution and the influencing factors, and then obtain the changing situation of the water temperature, the temperature field and the flow field of the water tank are simulated by using Fluent. The results showed that the water temperature will change with different coil decorate. The numerical model which is created by Fluent is appropriate and could be used to improve the layout of the coil in the water tank and speed up heating.

Law of the Surface Sediment Transport and Maintenance Methods of Beihai Silver Beach

2015 ◽  
Vol 1092-1093 ◽  
pp. 1247-1253
Author(s):  
Xin Liu ◽  
Yong Jun Huang ◽  
Fu Wan Gan
Keyword(s):  
Numerical Simulation ◽  
Sediment Transport ◽  
Surface Sediment ◽  
Beach Erosion ◽  
Scour Depth ◽  
Recovery Mechanism ◽  
Dynamic Action ◽  
Speed Up ◽  
The Law

Due to the disorder development of Beihai Silver Beach and the effects of the climate,there has been a serious phenomenon of beach erosion at Beihai Silver Beach,so to put forward effective and feasible maintenance methods of Silver Beach has the great significance.Through the sediment numerical simulation of the waters near the Silver Beach and analysis of the results and to conclude the law of sediment transport both in typhoon and normal wind and the sediment recovery mechanism of the Silver Beach.After a typhoon,the nearshore is scoured and the far offshore is deposited.The average scour depth is around 4cm and the average deposited height is around 2cm.The normal wind period is the sediment recovery period.After a year of normal wind,the nearshore and the far offshore is deposited,between them is a scouring area.The average scour depth is around 3cm and the average deposited height at the nearshore is around 4cm.The sediment recovery mechanism is that ,due to the dynamic action of the water in the normal wind period,it transports the deposition of sediment at the far offshore to the nearshore so as to make it recovered and gradually deposited.Based on the above regularity and mechanism,measures can be taken like that,to fill a sediment barrier parallel to the shoreline,which can make the water carry more sediment to the nearshore so as to speed up the recovery at Silver Beach.The sediment can be got from Baihutou and Yingpan Town.

Damage Assessment Method of High-Rise Structure Based on Monitoring Data and Numerical Simulation

2011 ◽  
Vol 243-249 ◽  
pp. 5242-5249
Author(s):  
Jun Teng ◽  
Chun Kai He ◽  
Jian Hua Chen
Keyword(s):  
Numerical Simulation ◽  
Damage Assessment ◽  
Assessment Method ◽  
Monitoring Data ◽  
Economic Losses ◽  
Fuzzy Evaluation ◽  
High Rise ◽  
Damage Degree ◽  
Speed Up ◽  
Tube Structure

Accurately and quickly evaluate the damage of high-rise buildings can effectively reduce economic losses and speed up the reconstruction of the earthquake region. Based on monitoring data and numerical simulation, this paper proposed a method to evaluate the damage of high-rise structures suffered earthquakes. Taking a frame-tube structure as example, the method’s availability is verified. The results can coincide well with the experimental phenomenon and the fuzzy evaluation results based on the monitoring data. This method can accurately and effectively evaluate the general damage degree of high-rise structures post-earthquake.

scholarly journals A modified parallel F4 algorithm for shared and distributed memory architectures

10.29007/98fh ◽  
2018 ◽  
Author(s):  
Severin Neumann
Keyword(s):  
Distributed Memory ◽  
Gröbner Bases ◽  
Parallel Architectures ◽  
Grobner Bases ◽  
Communication Overhead ◽  
Memory Consumption ◽  
The Matrix ◽  
Complex Procedure ◽  
Speed Up ◽  
Memory Architectures

In applications of symbolic computation an often required but complex procedure is the computation of Gröbner bases and hence it is obviousto realize parallel algorithms to compute them. There are parallel flavours of the F4 algorithm using the special structure of the occurring matricesto speed up the reduction. In this paper we start from this and present modifications allowing efficient computations of Gröbner bases on parallel architecturesusing shared as well as distributed memory. To achieve this we concentrate on one objective: reducing the memory consumption and avoiding communication overhead.We remove unrequired steps of the reduction, split the columns of the matrix in blocks for distribution and review the effectiveness of the SIMPLIFY function.Finally we provide benchmarks with up to 256 distributed threads of an implementation which will be available at https://github.com/svrnm/parallelGBC.

scholarly journals Solving Burgers’ equation with quantum computing

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Furkan Oz ◽  
Rohit K. S. S. Vuppala ◽  
Kursat Kara ◽  
Frank Gaitan
Keyword(s):  
Numerical Simulation ◽  
Direct Numerical Simulation ◽  
Burgers Equation ◽  
Exact Analytical Solution ◽  
Quantum Algorithms ◽  
Turbulence Models ◽  
Quantum Algorithm ◽  
Spatial Dimensions ◽  
Speed Up ◽  
Computational Fluid Dynamics Cfd

AbstractComputational fluid dynamics (CFD) simulations are a vital part of the design process in the aerospace industry. Although reliable CFD results can be obtained with turbulence models, direct numerical simulation of complex bodies in three spatial dimensions (3D) is impracticable due to the massive amount of computational elements. For instance, a 3D direct numerical simulation of a turbulent boundary-layer over the wing of a commercial jetliner that resolves all relevant length scales using a serial CFD solver on a modern digital computer would take approximately 750 million years or roughly 20% of the earth’s age. Over the past 25 years, quantum computers have become the object of great interest worldwide as powerful quantum algorithms have been constructed for several important, computationally challenging problems that provide enormous speed-up over the best-known classical algorithms. In this paper, we adapt a recently introduced quantum algorithm for partial differential equations to Burgers’ equation and develop a quantum CFD solver that determines its solutions. We used our quantum CFD solver to verify the quantum Burgers’ equation algorithm to find the flow solution when a shockwave is and is not present. The quantum simulation results were compared to: (i) an exact analytical solution for a flow without a shockwave; and (ii) the results of a classical CFD solver for flows with and without a shockwave. Excellent agreement was found in both cases, and the error of the quantum CFD solver was comparable to that of the classical CFD solver.

scholarly journals Material fatigue simulation using a periodic time-homogenisation method

2012 ◽  
Author(s):  
Guillaume Puel ◽  
Denis Aubry
Keyword(s):  
Numerical Simulation ◽  
Fatigue Life ◽  
Numerical Simulations ◽  
Time Scales ◽  
Combined Cycle ◽  
Evolution Model ◽  
The Other ◽  
Cycle Fatigue ◽  
Material Fatigue ◽  
Speed Up

This paper deals with the numerical simulation of combined cycle fatigue, which is characterised by two periodic loads, whose frequencies are very different one from the other. Rather than using classical fatigue life estimations, a time transient evolution model is solved using a periodic time-homogenisation method. This latter is based on the assumption that the time scales associated with the two periodic loads are decoupled. Different results on academic as well as industrial examples are presented. An extension of the proposed method up to three time scales is eventually proposed in order to speed up the numerical simulations.

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