Review of Flow Simulation Methods in Alluvial River

2020 ◽  
pp. 289-306
Author(s):  
Deepak Dhakal ◽  
Nayan Sharma ◽  
Ashish Pandey
Keyword(s):  
Flow Simulation ◽  
Simulation Methods ◽  
Alluvial River

Application of Numerical Flow Simulation Methods to Risk-Based Well Decommissioning Design

2020 ◽  
Author(s):  
Caroline Johnson ◽  
Morteza Haghighat Sefat ◽  
David Davies
Keyword(s):  
Flow Simulation ◽  
Simulation Methods ◽  
Numerical Flow Simulation

scholarly journals Cutting-Edge Turbulence Simulation Methods for Wind Energy and Aerospace Problems

Fluids ◽  
2021 ◽  
Vol 6 (8) ◽  
pp. 288
Author(s):  
Stefan Heinz ◽  
Joachim Peinke ◽  
Bernhard Stoevesandt
Keyword(s):  
Wind Energy ◽  
Turbulent Flow ◽  
Hybrid Methods ◽  
State Of The Art ◽  
Flow Simulation ◽  
The State ◽  
Simulation Methods ◽  
Basic Requirement ◽  
Turbulence Simulation ◽  
Correct Communication

The availability of reliable and efficient turbulent flow simulation methods is highly beneficial for wind energy and aerospace developments. However, existing simulation methods suffer from significant shortcomings. In particular, the most promising methods (hybrid RANS-LES methods) face divergent developments over decades, there is a significant waste of resources and opportunities. It is very likely that this development will continue as long as there is little awareness of conceptional differences of hybrid methods and their implications. The main purpose of this paper is to contribute to such clarification by identifying a basic requirement for the proper functioning of hybrid RANS-LES methods: a physically correct communication of RANS and LES modes. The state of the art of continuous eddy simulations (CES) methods (which include the required mode communication) is described and requirements for further developments are presented.

scholarly journals Simulation Methods for the Analysis of Complex Systems

2021 ◽  
pp. 95-113
Author(s):  
Hindolo George-Williams ◽  
T. V. Santhosh ◽  
Edoardo Patelli
Keyword(s):  
Reliability Assessment ◽  
Flow Simulation ◽  
Load Flow ◽  
Simulation Methods ◽  
Transportation Energy ◽  
Daily Lives ◽  
Industrial Systems ◽  
Simulation Based ◽  
Large Systems ◽  
Computationally Intensive

AbstractEveryday systems like communication, transportation, energy and industrial systems are an indispensable part of our daily lives. Several methods have been developed for their reliability assessment—while analytical methods are computationally more efficient and often yield exact solutions, they are unable to account for the structural and functional complexities of these systems. These complexities often require the analyst to make unrealistic assumptions, sometimes at the expense of accuracy. Simulation-based methods, on the other hand, can account for these realistic operational attributes but are computationally intensive and usually system-specific. This chapter introduces two novel simulation methods: load flow simulation and survival signature simulation which together address the limitations of the existing analytical and simulation methods for the reliability analysis of large systems.

Large Eddy Simulation

1996 ◽  
Author(s):  
Joel H. Ferziger
Keyword(s):  
Numerical Simulation ◽  
Large Eddy Simulation ◽  
Direct Numerical Simulation ◽  
Turbulent Flow ◽  
Turbulent Flows ◽  
Flow Simulation ◽  
Simulation Methods ◽  
Eddy Simulation ◽  
Simulation Techniques ◽  
Large Eddy

Over a decade ago, the author (Ferziger, 1983) wrote a review of the then state-of-the-art in direct numerical simulation (DNS) and large eddy simulation (LES). Shortly thereafter, a second review was written by Rogallo and Moin (1984). In those relatively early days of turbulent flow simulation, it was possible to write comprehensive reviews of what had been accomplished. Since then, the widespread availability of supercomputers has led to an explosion in this field so, although the subject is undoubtedly overdue for another review, it is not clear that the task can be accomplished in anything less than a monograph. The author therefore apologizes in advance for omissions (there must be many) and for any bias toward the accomplishments of people on the west coast of North America. In the earlier review, the author listed six approaches to the prediction of turbulent flow behavior. The list included: correlations, integral methods, single-point Reynolds-averaged closures, two-point closures, large eddy simulation and direct numerical simulation. Even then the distinction between these methods was not always clear; if anything, it is less clear today. It was possible in the earlier review to give a relatively complete overview of what had been accomplished with simulation methods. Since then, simulation techniques have been applied to an ever expanding range of flows so a thorough review of simulation results is no longer possible in the space available here. Simulation techniques have become well established as a means of studying turbulent flows and the results of simulations are best presented in combination with experimental data for the same flow. There is also a danger that the success of simulation methods will lead to attempts to apply them too soon to flows which the models and techniques are not ready to handle. To some extent, this is already happening. Direct numerical simulation (DNS) is a method in which all of the scales of motion of a turbulent flow are computed. A DNS must include everything from the large energy-containing or integral scales to the dissipative scales; the latter is usually taken to be the viscous or Kolmogoroff scales.

Detailed Cold-Flow Simulation to Estimate Mass Flow Distribution of Aircraft Combustor

2011 ◽  
Author(s):  
Mitsumasa Makida ◽  
Naoki Nakamura ◽  
Osamu Nozaki
Keyword(s):  
Mass Flow ◽  
Development Process ◽  
Estimation Method ◽  
Flow Simulation ◽  
Grid Method ◽  
Simulation Methods ◽  
Flow Ratio ◽  
Simulation Code ◽  
Cold Flow ◽  
Mass Flow Ratio

In the TechCLEAN project of JAXA, a combustor for a small aircraft engine has been developed. The combustor was tuned to show the behavior of the Rich-Lean combustion through combustion tests under atmospheric and practical conditions. Finally, the full annular combustor was successfully tuned to reduce NOx emissions to 38.1% of the ICAO CAEP4 standard under ICAO LTO cycles, also sustaining basic performances as an aircraft combustor. In the development process of the combustor, numerical simulation methods were also utilized as analysis tools to accelerate the development of the combustor. To use them in the screening process of the combustor design, we focused on cost-effective simulation methods adopting the cold-flow RANS simulation code UPACS which has been developed in JAXA. Moreover, to simplify the treatment of calculation grids of the combustor with complicated configuration, we also utilized combination of the overset grid method and the attached multi-block grid method. In the previous report, we introduced the overview of the application of the cold-flow simulation in the combustor development process. Subsequently, in this report, we focus on the effect of combustor configuration parameters to the air mass flow ratio among fuel nozzles, dilution air holes and cooling air holes on the combustor linear. Then we also show the estimation method of the effective open area of combustor liners, mass flow ratio between air holes, and total pressure loss of the combustor.

Critical issues in driving simulation methods and measures

2004 ◽  
Author(s):  
Jeff Caird ◽  
Matthew Rizzo ◽  
Peter Hancock
Keyword(s):  
Driving Simulation ◽  
Simulation Methods ◽  
Critical Issues
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